If you want to discover your genetic history and where you came from... you’ve found the right place!

888-806-2588

review of scientific and news articles on dna testing and popular genetics

An Anthropology Student's Theory

Monday, March 18, 2013

We received an interesting email from Bailey Edsall-Parr, an anthropology student, customer and genealogy enthusiast from Michigan. We present it here as a guest blog post.

I am currently researching the inter-relatedness of most, if not all, humans alive today. Anyways, I have a personal interest in genetics, mathematics, statistics and probability theory and have incorporated it into my studies. Any information if my theory is in any way "valid" is what I am seeking.  Before I elaborate my theory, here is some background information: According to the Law of Truly Large Numbers... "that with a sample size large enough, any outrageous thing is likely to happen. In a sample of 1000 independent trials, the probability that the event does not happen in any of them is 
or 36.8%. The probability that the event happens at least once in 1000 trials is then 1 − 0.368 = 0.632 or 63.2%. The probability that it happens at least once in 10,000 trials is .

.
This means that this 'unlikely event' has a probability of 63.2% of happening if 1000 chances are given, or over 99.9% for 10,000 chances. In other words, a highly unlikely event, given enough tries, is even more unlikely to not occur.

That was the Law of Truly Large Numbers. What I have below is from a computer scientist:   

If there were random intermixing, then we would each have ~1 million ancestors living in 1500 AD, out of a world population of ~500 million. So the fractional overlap between two people would be about 1/500th.

But the probability that two people share at least one common ancestor would be essentially 100%.   Basically, you are choosing a random number between 1 and 500 a million times and you're asking whether you ever choose number 500.  In a million trials, we expect this to happen 2000 times.  So that it happens at least once is guaranteed.

If we get rid of the random intermixing, the fractional overlap will drop to much less than 1/500th.  But I suspect that the probability of at least one overlap will remain very high.

Calculations and Premises
If the population in 1500 was 500 million, and it is 6 billion today (12x larger).

If the average generation length is 30 years, there are 17 generations in 500 years.

So the average number of surviving children per mother is exp((log 12)/17) = 1.157

Since a child has two parents, the average number of surviving children per person is 2 * 1.157 = 2.315

So this is the average growth rate per generation for the descendants of a person in 1500.
2.315^17 = 1.575 million. So an average person in 1500 has about 1.5 million offspring alive today.  Sampling from the whole world, the probability that a random person from 1500 is an ancestor of a random person in 2000 would be 1.5 million / 6 billion = 0.025%. If you were only considering people in a region like Europe, it would probably be something like 1.4 million / 700 million = 0.2%.

Here is my theory:

Let's say 500 years ago, due to this probabilistic law, almost everyone alive today had at least one ancestor from like say, China, Japan or other far-off places. This may not apply, of course, to isolated populations. 

Would this theory likely be true given enough time?

Thank you for your time and efforts. I have never been disappointed with your products and your postings are quite interesting for me,especially, being an anthropology student.

Bailey Edsall-Parr

Comment? Contact the author at baileyedsallparr (a) yahoo.com.


Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Genetic Genealogy Like Astrology?

Monday, March 18, 2013

Maybe If It's First Generation Sex-Linked Testing, Not Autosomal 

Dust off the crystal ball. Scientists consider DNA ancestry services “genetic astrology,” according to a recent BBC article by Pallab Ghosh. In “Some DNA Ancestry Services Akin to ‘Genetic Astrology’,” Ghosh quotes Professor David Balding as maintaining that ‘“such histories are either so general as to be personally meaningless or they are just speculation from thin evidence.’” One article, “Don’t Believe the Guy Who Claims He’s Descended From Vikings,” quotes evolutionary geneticist Mark Thomas, as saying “these tests have so little rigor that they are better thought of as genetic astrology.”  That may be right about some tests. But the key word is “some.”

Not all DNA ancestry tests or companies are created equal.  It is as much an oversimplification to suggest they are as it would be to claim that all lab tests are the same or all pharmaceutical drugs are the same. Do you get a shot for epilepsy when you have diabetes? Hardly. There are DNA tests and there are DNA tests. Customers are generally careful to get  the right medicine from a reputable doctor. A customer needs to be just as careful choosing a DNA test and a DNA ancestry company. Not all DNA ancestry companies, even some of the larger companies, have an ISO certified lab, for instance. This not only guarantees the reliability of results, it is also the highest standard in the genomics industry. A few have this laboratory benchmark, but it is, unfortunately, not required, in direct- to-the-consumer DNA testing. Would you want to entrust your genetic identity with anything less? The buyer needs to be aware that with non-certified labs there is a stronger possibility of contamination or lost or swapped samples. I know someone who was the unknown victim of a sample swapped. He thought he was someone else for two years.

Secondly, there are a variety of tests to choose from. There are sex-linked tests (Y chromosome, X chromosome- mitochondrial) and non-sex linked tests called autosomal. The sex-linked tests are haplotype tests based on genetic markers handed down by the male (Y chromosome, received only by other males) or female (mitochondrial). The industry started out with sex-linked testing, but its limitations dictated a move increasingly to autosomal or non-sex linked testing. There are weaknesses with sex-linked tests.

The mitochondrial genome is small compared with the nuclear genome according to the article “Mitochondrial Genome Analysis with Haplotyping” which means there cannot be that much variation with mitochondrial DNA analysis. For instance, some have expressed doubts that the recently found Leicester skeleton could be Richard III because of the mitochondrial DNA analysis that was done. Live Science writer, Stephanie Pappas, quoted Maria Avila, a computational biologist at the Center for GeoGenetics at the [British] Natural History Museum as saying “people could share mitochondrial DNA even if they don’t share a family tree” (Pappas).  

How is this possible? Mitochondrial DNA is ancient DNA and mutates slowly.  In the article, “Doubts Remain that the Leicester Body is Richard III,” a Mark Thomas at University College London is quoted as saying that “people can have matching mitochondrial DNA by chance and not be related.” So, it might not be Richard III after all. Male line haplotype testing has different limitations. “The Male Y- linked tests have very rapid mutation rates and are very fragile, so you can get a lot of errors with that type of testing,” according to Dr. Donald N.Yates of DNA Consultants.

According to a recent New Scientist article by Colin Baras, “The Father of All Men Is 340,000 Years Old,” the Y chromosome seems more ancient than previously thought. If so, it is also less stable than we thought. Brian Sykes, Professor of Genetics at Oxford University and the author of The Seven Daughters of Eve, makes a strong argument that the Y chromosome is weakening and in trouble in his book, Adam’s Curse. He says it is “doomed to a slow and humiliating decline” (279) because of its instability and rapid genetic mutation and is thus headed toward extinction. Before the 1990’s paternity testing was based on Y chromosome comparisons and limited to fathers and sons. Sometimes, an uncle would be mistaken as the father. Today, it relies on autosomal DNA comparisons, can be applied to females, and is 99.99% accurate.

But then there are non-sex-linked Autosomal DNA tests which are based on a different science altogether. Anyone can take this traditional type of Autosomal DNA test because it does not rely on X or Y chromosomes (women are unable to take the Male Y- linked test and must entice a male in her line, if one is available, to take this test). This test is not testing ancient DNA but  goes back only some four or five generations, so it does not have these limitations. And it provides a complete analysis of all ancestral lines. Not just one line at a time as in haplotype testing. This is next generation ancestry DNA testing and the wave of the future. Moreover, this type of testing is more stable and has more scientific validity as it uses the same science that is used in the legal court system, by the government, and on CSI comparing loci markers to population databases. And two research teams independently reached the same groundbreaking results that the DNA mutation rate is slower than previously thought:  James X Sun et al., in the article, "A Direct Characterization of Human Mutation Based on Microsatellites," in Nature Genetics 44/10 (October 2012):1161-65, and A. Kong et al., in the article "Rate of de novoMutations and the importance of Father's Age to Disease Risk," in Nature 488 (2012):471-75. All done by the magic of math and laws of large numbers.

What does this mean concerning autosomal DNA ancestry tests? They have even more scientific validity. This second-generation type of DNA ancestry testing is based on these same genetic markers, and that is confirmation that the alleles on your DNA that are examined using a statistical basis have been relatively unchanged for the past 20,000 years. That’s about twice the length of what we call world history, hence a meaningful enough time frame for valid inferences about population patterns and ancestry of individuals. These are markers that everyone has (and why anyone can take an autosomal ancestry test).  These genetic markers change at a much slower rate than the Y chromosome which seems to be highly changeable, depending on the father’s age (Kong 201). (The Y chromosome is a marker only males have. It is used for other types of tests: male, haplotype, sex-linked DNA tests. Only males can take these tests, and it only provides information about that one male line).

Of course, anything can be over-interpreted. DNA testing is not magic. Maybe you should put that crystal ball up after all.

Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Some Indians Migrated to Australia 4,000 Years Ago

Tuesday, January 15, 2013

Genome-wide data substantiate Holocene gene flow from India to Australia

  1. Mark Stonekinga
  1. Edited by James O’Connell, University of Utah, Salt Lake City, UT, and approved November 27, 2012 (received for review July 21, 2012

    From PNAS Online:  http://www.pnas.org/content/early/2013/01/09/1211927110

Abstract

The Australian continent holds some of the earliest archaeological evidence for the expansion of modern humans out of Africa, with initial occupation at least 40,000 y ago. It is commonly assumed that Australia remained largely isolated following initial colonization, but the genetic history of Australians has not been explored in detail to address this issue. Here, we analyze large-scale genotyping data from aboriginal Australians, New Guineans, island Southeast Asians and Indians. We find an ancient association between Australia, New Guinea, and the Mamanwa (a Negrito group from the Philippines), with divergence times for these groups estimated at 36,000 y ago, and supporting the view that these populations represent the descendants of an early “southern route” migration out of Africa, whereas other populations in the region arrived later by a separate dispersal. We also detect a signal indicative of substantial gene flow between the Indian populations and Australia well before European contact, contrary to the prevailing view that there was no contact between Australia and the rest of the world. We estimate this gene flow to have occurred during the Holocene, 4,230 y ago. This is also approximately when changes in tool technology, food processing, and the dingo appear in the Australian archaeological record, suggesting that these may be related to the migration from India.

Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Junk DNA? We Don't Think So

Monday, January 14, 2013

We are our DNA. It was not a surprise to find that our entire DNA is Functional (“Junk DNA Isn’t Junk, and That Isn’t Really News”). The surprise is in the discovery of what we can do with what we once thought was junk. According to that recent NPR article, “It is a massive control panel that regulates the activity of our genes.” Our genes “would not work” without it. So instead of being junk- they are critical and “control how cells, organs, and other tissues behave.” But we can also now read the markers and mutations on this “panel” and discover much more information than knowing it is just working efficiently for our body. This knowledge is considered a “major medical and scientific breakthrough” (Ibid.). We just have to read it well.

But first, what is DNA exactly? John Wilwol, in his recent NPR article, “A ‘Thumb’ on the Pulse of What Makes Us Human,” quotes Sam Kean, author of the book, The Violinist’s Thumb And Other Lost Tales of Love, War, and Genius, As Written by Our Genetic Code, as saying that DNA is what makes us who we are. Wilwol further quotes Kean to help us understand what DNA is and how it differentiates from genes: “ ‘While DNA is a thing- a chemical that sticks to your fingers, he writes, genes are more conceptual in nature, …“‘like a story with DNA as the language the story is written in.”

So if DNA is a language how are we able to read it? All parts of our genetic code are now readable and meaningful. Marker locations (loci) are spread across one’s entire genome, not confined to one’s male (Y chromosome) or female (mitochondrial) DNA. (This is how sex-linked, haplotype tests that follow one line at a time are analyzed). Different mutations are handed down genetically – different according to the region where one’s ancestors lived.

Because of this new ability to read markers, consumers are now able to buy Autosomal DNA tests that provide a complete analysis of where all one’s ancestors’ ethno-geographic origins – reflecting the entire spectrum of all ancestral lines. Not just one line at a time as in haplotype testing. This is next generation ancestry DNA testing and the wave of the future. Anyone can take an Autosomal DNA test because it does not rely on X or Y chromosomes (women are unable to take the Male Y- linked test and must entice a male in her line, if one is available, to take this test). The future is now in many ways.

What else can you learn from Autosomal DNA testing? Anne Tergesen, in a recent article in the Wall Street Journal,” quotes Megan Molenyak, author of, Hey America, Your Roots Are Showing, as saying that this relatively new test deciphers the amount of DNA shared between those whose common ancestors lived within the last half-dozen or so generations. Tergersen explains it like this, “Y-DNA and mitochondrial DNA can connect people whose common ancestors lived recently or hundreds of years ago. But to find out how closely you are related—and to locate relatives besides those on your direct maternal or paternal lines—you will need an autosomal DNA test.” (Of course, you would both need one to compare) and “in general, the more DNA two people share, the closer their connection”.

But there are even more things on the horizon with Autosomal DNA for the future. Personalized Medicine. According to a recent Smithsonian article, “Fetal Genome Sequenced Without Help From Daddy,” “A fetus’ entire genome can now be sequenced” from the mother alone with a “99.8% accuracy.” How is that possible? It was just “last month clinicians announced that they could sequence a fetus’ entire genome by taking samples from the pregnant mother’s blood and that of the father to be” (“Fetal Genome”). Now they have a “more difficult, but more complete method [that] uses DNA from the pregnant woman and the fetus to map out every last letter of the fetal genome…with the advantage that it can pick up mutations that a fetus has but its parents do not” (Ibid.).  Rob Stein quotes Dr. Alan Guttmacher, director of the National Institute for the Child Health and Human Development in a recent NPR article, “Genome Sequencing For Babies Brings Knowledge and Conflicts,” as saying, “Instead of screening for currently something like 30 conditions, it would allow you to screen for hundreds if not thousands, [of conditions] at birth.  He goes on to say that, “One could imagine a day where knowing someone’s entire genome sequence at birth, you could really begin to think about structuring health care, their dietary choices, their exercise choices…early in life, in a way that would have an impact on truly lifelong health.” Stein says that this gene sequencing could “spot babies that are prone to conditions such as obesity, diabetes, heart attacks or cancer” and that we may soon be “sequencing all babies when they’re born.”  It could be a wonderful tool. But we are not there yet.

According to Rob Stein in another recent NPR article, “Perfection is Skin Deep: Everyone has Flawed Genes,” Scientists have determined we are all more flawed than they thought. “Researchers discovered that normal, healthy people are walking around with a surprisingly large number of mutations in their genes.” Chris Tyler-Smith of the Wellcome Trust Sanger Institute in Cambridge, England and his colleagues analyzed the DNA of 179 people from several countries who volunteered their genetic information to the 1,000 Genomes Project.

 

In a published paper in the American Journal of Human Genetics, the researchers reported that though none of the people whose DNA was studied were sick, the average person has about 400 minor flaws and one or two that could contribute to disease. Tyler-Smith says, “It’s a bit surprising that people should be walking around apparently healthy yet we’re seeing known disease-causing mutations in their genomes,” he says. “But the answer was that these tended to be for mild and very often late-onset conditions. Things like heart disease, an increased risk of disease or developing cancer. On its website, the American Diabetes Association highlights the interaction of genetic and environmental factors: “You inherit a predisposition to the disease then something in your environment triggers it. Genes alone are not enough.”

 

So the problem is not so much with the analytical tool but rather the possibility of over- interpretation. Again, we just have to read it well, with the same critical eye for what is written in us as that which is written by us. And who knows what else we will soon be able to discover from reading our DNA?

Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Is There an Irony Gene?

Thursday, December 13, 2012
Richard Lewontin's Disappearing Act

The octogenarian bête noir of biological determinism reviews three new books about why we should be proud of our ancestry--or just be quiet about it. "There is a certain irony," he writes, "in claiming an undemonstrated biological superiority for a group, six million of whom were slaughtered for their claimed natural degeneracy." If your dynosaur feathers are not ruffled yet, read on. 

"Is There a Jewish Gene?"

by Richard Lewontin

December 6, 2012,

The New York Review of Books


Legacy:  A Genetic History of the Jewish People
by Harry Ostrer
Oxford University Press, 264 pp. $24.95


The Genealogical Science:  The Search for Jewish Origins and the Politics of Epistemology
by Nadia Abu El-Haj
University of Chicago Press, 311 pp., $35.00



Zionism and the Biology of the Jews (Zionut Vehabiologia Shel Hayehudim

by Raphael Falk
Resling, 2006 (not yet published in English)
Richard Lewontin.
Courtesy Istituto Veneto.

The question of ancestry has been of human concern in virtually all cultures and over all times of which we have any knowledge. Whether it be a story about the origin of a particular tribe or nation and its subsequent mixture with other groups, or curiosity about a family history, there is always the implication that we understand ourselves better if we know our ancestors and that we, within ourselves, reflect properties that have come to us by an unbroken line from past generations. As treasurer of the Marlboro Historical Society in Vermont, I am the recipient of requests for printed copies of the Reverend Ephraim Newton’s mid-eighteenth-century history of our town, 70 percent of whose pages consist of “Genealogical and Biographical Notes” and a “Catalog of Literary Men.” Over and over our correspondents write of the “pride” they have in descending from these early settlers.

Surely pride or shame are appropriate sentiments for actions for which we ourselves are in some way responsible. Why, then, do we feel pride (or shame) for the actions of others over whom we can have had no influence? Do we, in this way, achieve a false modesty or relieve ourselves of the burdens of our own behavior? As a descendant of late-nineteenth-century Eastern European immigrants I cannot depend on Reverend Newton’s pages to explain my frequent contributions to The New York Review, but neither have the extensive “begats” in Genesis 10 or Matthew 1 been more enlightening.  Read More...

Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Behind the Numbers: Phyllis Starnes

Tuesday, November 20, 2012

Check Out DNA Fingerprint Plus $300 


Phyllis Starnes:  Designer Genes


We interviewed Phyllis E. Starnes, assistant investigator, to find out what fascinates her about the field of DNA testing. Her story is the first in a series titled "Behind the Numbers" about the workers behind the scenes in our industry, from lab technicians to statisticians.

 

Interviewer:  How did you first get interested in DNA?

PES:  I went to the Melungeon Union in Kingsport [Tennessee, in 2002]. Beth Hirschman had her “stalk,” a diagram of her Melungeon family tree with all the names in her genealogy, many of which were also my surnames. I heard Dr. Yates speak at that meeting. They had their lines all pinpointed, thanks to DNA studies.

Interviewer:  What was your next step after that?

PES:  I came home and did a lot of genealogy research on the computer.

Interviewer: And then?

PES:  The first year DNA Consultants opened for business, which was 10 years ago, I ordered a Y chromosome test for my husband Billy. Other companies were offering the same product, but DNA Consultants was the only one to give you a full analysis and customized explanation of things. Then I ordered my own mitochondrial DNA test.

Interviewer:  Any surprises?

PES:  Billy’s top matches for his male line, the Starnes surname line, were Macedonia and Albania. My mitochondrial mutations matched Native Americans. I became the first of the “Anomalous Cherokees” whose female lineages didn’t fit in the traditional scheme of “Indians out of Asia.” In fact, my Hypervariable Region 2 mutations matched only one other sample in the world, and that was Dr. Yates, who is Cherokee in his direct female line.

Interviewer:  What did your husband and the rest of your family think?

PES:  Some were excited, as I was, but most were just not interested. My kids thought the strong Native American matches were very interesting.

Interviewer:  What other family members did you test?

PES:  As soon as autosomal testing arrived, with the DNA Fingerprint Test, I did Billy and myself, of course, Julia, Kiely and Holli (our three daughters), our granddaughter Keely, my Dad’s sister and Mother’s sister, an uncle and his wife, a niece and a cousin.

Interviewer:  What did you find out?

PES:  Within the immediate family, it was obvious who got which ancestry and trait from whom, and how they all resonated. One of the big surprises was my father’s side, which proved to have quite a bit of Native American and Iberian. The “First Peoples” gene came from his side and passed on down through our girls. On my mother’s side, 11 out of 20 matches was India.

Interviewer:   India!?

PES:  Yes, it appears we were finally seeing the extensive Romani/Gypsy heritage in her family. People had always told me I was like a Gypsy, from my clothes and jewelry to my attitude and outlook. When Billy was in the Navy, I told him one day, ‘I’m tired of being a Gypsy.’ I said I wanted to settle down in one place.

Interviewer:  Did you settle down?

PES:  Yes, we’ve lived in a small town in East Tennessee for almost 40 years. We moved here in 1973.

Interviewer:  Any other surprises in your DNA?

PES:  If you were to chart our geographical matches, both in terms of autosomal DNA as well as the female and male lines, it would surround the Mediterranean. That’s where Familial Mediterranean Fever comes in.

Interviewer:  Who has FMF in your family?

PES:  Billy, myself, Julia, Holli and a cousin. I’m sure others have it but it has not been diagnosed and they may call it instead fibromyalgia. Brent Kennedy [author of a book on Melungeons and their genetics] is a cousin many times over.

Interviewer:  What do you enjoy about your job?

PES:  It’s like a holiday every day. With customers coming out of North Carolina or East Tennessee, I see a lot of the same matches and genealogy I have personally encountered in my own experience with DNA testing. I recognize a lot of genetic cousins.

Interviewer:  When did you first hear the word “Melungeon”?

PES:  I grew up in Southwest Virginia in the little town where the Stony Creek Church is located. The church minutes contain the first written instance of the word. The register is all of mine and Billy’s ancestors, and part of Beth’s [Elizabeth Hirschman, author of books on Melungeons].

Interviewer:  What do you see in the future of DNA testing?

PES:  I think we’ve only glimpsed the tip of the iceberg so far, even though it’s been 10 years. We’ll continue to have new knowledge, new products. I highly recommend our customized approach.

Interviewer:  Any parting shots?

PES:  I’ve worked in sales all my life—jewelry management and design, my own interior decorating shop, running my own hair salon—but I have found something to be truly excited about in DNA. Funny I couldn’t get this excited about selling diamonds! If you think about it, your genes are the ultimate design for living.



Donald Yates and Elizabeth Hirschman speaking at Fourth Melungeon Union, Kingsport, Tenn., in June 2002. Hirschman, a professor at Rutgers University, went on to publish Melungeons: The Last Lost Tribe in America. Yates, a professor at Georgia Southern University at the time, founded a service for evaluating DNA reports that became DNA Consultants. The two authors have collaborated on a number of books and articles, including Jews and Muslims in British Colonial America. 












Check Out Premium DNA Fingerprint Plus $375
 






















Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Evolution and Ancestry: DNA Mutation Rates

Tuesday, October 23, 2012
Check Out DNA Fingerprint Plus $300 


As often happens in the annals of science, two research teams independently reached the same groundbreaking results, and publication to the scientific world occurred simultaneously. The breakthrough in the present case concerned the mutation rate of DNA and has profound implications for human evolution as well as for DNA Consultants' new offerings in autosomal DNA ancestry analysis, specifically our Rare Genes from History Panel.

The following two studies are already much cited by geneticists, though they have garnered little attention in the press. They appeared in online versions on the same day, August 23.

James X Sun et al., "A Direct Characterization of Human Mutation Based on Microsatellites," Nature Genetics 44/10 (October 2012): 1161-65.

A. Kong et al., "Rate of de novo Mutations and the importance of Father's Age to Disease Risk," Nature 488 (2012):471-75.  
 
A table summarizing their findings and older data is provided below for DNA testing customers' convenience.

 

DNA Mutation Rates

Study or Source

Type of DNA

Sample or Method

Rate per Generation

Time Depth in Years

Sun 2012

autosomal

microsatellites

2,477 mutations

in Icelanders

.001-

.0001

25,000 to

250,000

Kong 2012

single nucleotide

polymorphisms

4,933 mutations

in Icelandic trios

63.2 or

.000000012

Very great

 

Butler 2009

Core CoDIS STRs

(microsatellites)

compiled from

studies

.0028-.0001

9,000 to

25,000

Zhivotovsky 2004

Y chromosome

STRs

Y haplogroup

comparisons

.00069

36,000

Heyer 1997

Y chromosome

tetranucleotides

42 males in forensic database

.002

12,500

FamilyTreeDNA

2004

Y chromosome

STRs

Estimated from

customer base

.004

6,250

Brinkmann 1998

STRs (CoDIS

markers)

10,844 Father-son comparisons

0-.007

3,500 to

Very Great

Parsons  1997

mitochondrial

DNA

134 mtDNA

lineages

.000029

862,000

DNA Consultants

Rare Genes

from History

average estimate

across loci

.001325

19,000

 
From this it can be seen that mutation rates vary from a low with SNPs to the high rate of Y chromsome STRs (as much as 0.4 % per generation). DNA keeps surprising us by proving to be more stable than we would tend to expect, dutifully transcribing its original values from generation to generation without many mistakes or changes. Only Y chromosome seems to be highly changeable, depending on the father's age (Kong 2012). Autosomal STRs mutate at a rate between SNPs and the Y chromosome, between every 19,000 or 25,000 and 250,000 years. 

For our new autosomal ancestry markers, that is confirmation that the alleles we are examining on a statistical basis are pretty much unchanged for the past 20,000 years. That's about twice the length of what we call world history, hence a meaningful enough time frame for valid inferences about population patterns and ancestry of individuals.

See also:  Rare Genes from History:  DNA Consultants’ Next-Generation Ancestry Markers

Rare Genes from History Panel Now Available for $289

Prelaunch of New Autosomal Products

Emerging Prehistory of Ethnic Groups

Technical Literature on Genotyping, including autosomal DNA and Forensic Literature

 

DEFINITION:  mutation  
A change in a DNA sequence, either spontaneous within a generation or inherited, sometimes from a very distant ancestor. Mutations usually do not affect our health or cause any differences in our appearance. In other words, they are not genes proper and do not “code” for new proteins. Even though they are non-coding genes, though, they are useful in tracing lineages.            

From A Glossary of Common DNA Terms

 











 
Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Rare Genes from Ancient DNA

Wednesday, October 17, 2012
Check Out DNA Fingerprint Plus $300 


Authentic sequences from the ancient human past are a rarity in the world of DNA testing. But when a team of archeologists put the mummies of King Tut and his immediate family on the operating table in 2010, they were successful in deriving almost complete DNA profiles for the boy king and others in the Amarna dynasty that ruled Egypt more than three thousand years ago. Now three of the DNA signatures of Egyptian pharoahs from that famous forensic study by Zahi Hawass and the Supreme Council of Antiquities in Cairo--plus others newly discovered--are available as part of a commercial direct-to-the-consumer autosomal DNA testing panel.

In October 2012, DNA Consultants launched its Rare Genes from History Report. Based on a customer's DNA fingerprint or autosomal profile, the additional analysis sells for $289. It compares your laboratory results with 26 rare alleles or ancestry markers whose trail has been traced through world history and evolving population changes by the company's statisticians. 

Take the Thuya Gene, for instance. Like most of the other Rare Genes from History, it has an African origin in deep time. But it experienced its greatest expansion in ancient Egypt, where it was carried by the queens of Upper and Lower Egypt and High Priestesses of the temples. It was reported in the profile of Queen Thuya's mummy, and we can see that she passed it to her children, grandchildren and descendants. King Tut was a great-grandson and has it, according to the new forensic evidence.

Today, as many as one-fourth of all people on earth would test positive for the Thuya Gene. It is twice as common in Somalia as outside Africa and is found in 40% of Muslim Egyptians.

That's not so rare after all, but unsurprising. Egyptian civilization lasted for three thousand years and sowed the seed of its peoples and ideas throughout the world. We can imagine that Autosomal Thuya started out in East Africa about 100,000 years ago, and that her descendants were prominent in the first out-of-Africa group as well as in the Middle Easterners who helped spread agriculture, animal husbandry, religion and settled town life to Europe. 

The spirit of Thuya lives on in 27% of Jews who have been tested in academic studies. Extrapolating to world population figures, that's nearly 400,000 people, about evenly divided between the United States and Israel.

See also "Prelaunch of New Autosomal Products" (August 26, 2012)
"Rare Genes from History" (webpage)
"Rare Genes from History Panel Now Available for $289.00"

The classic DNA study by the Supreme Council of Antiquities in Cairo, Egypt is: Hawass Z, Gad YZ, Ismail S, et al. Ancestry and Pathology in King Tutankhamun's Family. JAMA. 2010;303(7):638-647. The feat by scientists has also been featured on Discovery Channel

Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Rare Genes from History: New Autosomal Ancestry Markers from DNA Consultants

Sunday, September 30, 2012
Check Out DNA Fingerprint Plus $300 


PRESS RELEASE
Rare Genes from History:  DNA Consultants’ Next-Generation Ancestry Markers

PHOENIX -- (Oct. 1, 2012) -- DNA typing has gone from successes in the criminal justice system and paternity testing to new heights in mapping genetic diseases and tracing human history. John Butler in the conclusion to his textbook Fundamentals of Forensic DNA Typing raised an important question about these trends. How might genetic genealogy information intersect with forensic DNA testing in the future?

"At DNA Consultants, that new chapter in DNA testing arrived several years ago," said Donald Yates, chief research officer and founder. "As we approach our tenth anniversary, examining human population diversity continues to be the whole thrust of our research, and it just gets more and more exciting."

The company's DNA database atDNA 4.0 captures and puts to use every single published academic study on forensic STR markers, the standard CoDIS markers used in DNA profiles for paternity and personal identification. In 2009, the company introduced the first broad-scale ethnicity markers and created the DNA Fingerprint Plus.

But its innovations didn’t stop there. In October 2012, the company announced the launch of its Rare Genes from History Panel.

Why CoDIS Markers?

“Theoretically,” noted Butler in 2009, “all of the alleles (variations) that exist today for a particular STR locus have resulted from only a few ‘founder’ individuals by slowly changing over tens of thousands of years.”

How true! Hospital studies have determined that the most stable loci (marker addresses on your chromosomes) have values that mutate at a rate of only 0.01%. That means the chance of the value at that location changing from parent to progeny is once every 10,000 generations.

So the autosomal clock of human history ticks at an even slower quantum rate than mitochondrial DNA. Like “mitochondrial Eve,” its patterns were set down in Africa over 100,000 years ago when anatomically modern humans first appeared on the stage of time.

Though the face value of the cards in the deck of human diversity never changed—and all alleles can be traced back to an African origin—as humans left Africa and eventually spread throughout the world, alleles were shuffled and reshuffled. Humanity went through bottlenecks and expansions that emphasized certain alleles over others. Genetic pooling, drift and selection of mates produced regional and country-specific contours much like a geographic map. 

By the twentieth century, when scientists began to assemble the first genetic snapshots of people, it was found that nearly all populations were mixed, some more than others. The geneticist Luigi-Luca Cavalli-Sforza at Stanford University proved that there is almost always more diversity within a population than between populations.

So if there is no such thing as a “pure” population—a control or standard—how are we to make sense of any single individual’s ancestral lines? Statistical analysis provides the answer. And rare genes are easier to trace in the genetic record than common ones. Their distinctive signature stands out.

Back Story:  It All Began with the Melungeons

About the same time as DNA Consultants' scientists were cracking the mystery of the Melungeons, a tri-racial isolate in the Appalachians, they became aware of certain very rare alleles carried by this unusual population in relatively large doses. The Starnes family, for instance, in Harriman, Tennessee, was observed to have a certain rare score repeated on one location in the profiles of members through three generations. The staff dubbed it “the Starnes gene.”

Soon, company research had characterized 26 rare autosomal ancestry markers—tiny, distinctive threads of inheritance that reflected an origin in Africa and expansion and travels through world history. Genes in this new generation of discoveries were named after some distinctive feature associated with the pattern they created in human genetic history--for instance, the Kilimanjaro Gene after its source in Central East Africa. The Thuya, Akhenaten and King Tut genes were named for the royal family of Egypt whose mummies were investigated by Zahi Hawass’ team in 2010.

The Starnes Gene” became the Helen Gene. Because of its apparent center in Troy in ancient Asia Minor and predilection for settling in island populations, it was named for "the face that launched a thousand ships," in the famous phrase by Christopher Marlowe.  

All 26 of DNA Consultants' new markers are rare. Not everyone is going to have one. But that’s what makes them interesting, according to Dr. Yates.

Coming from all sections of human diversity—African, Indian, Asian and Native American—they are like tiny gold filaments in a huge, outspread multi-colored tapestry, explains Phyllis Starnes, assistant principal investigator and wife of the namesake of the first discovery. But does that mean that her husband has a connection to Helen of Troy? The markers don’t work on such a literal level, but it does imply that Billy Starnes shares a part of his ancestral heritage with an ancient Greek/Turkish population prominent on the page of history.

Over the past two decades, geneticists have worked out the macro-history and chronology of human migrations in amazing detail and agreement. The Rare Genes from History Panel is another reminder--in the words of an American Indian ceremonial greeting--that “We Are All Related.”

These rare but robust signals of deep history can act as powerful ancestral probes into the tangled past of the human race as well as unique touchstones for the surprising stories of individuals.

For more information about the science of autosomal DNA ancestry testing, visit DNA Consultants or check out its Twitter or Facebook page. 

#  #  #  


Distribution map of the Egyptian Gene shows its African origin, partial presence in Coptic populations today (green dots in Egypt) and scattered incidence around the world. 


Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 

Video Book Review: Jon Entine in Israel

Tuesday, July 31, 2012
Check Out DNA Fingerprint Plus $300 



We previously reviewed Jon Entine's masterful book on Jewish DNA:  Rounding Up the Usual Suspects. But Arlene Belzer has now sent us a new video on the subject with an interview of the author from Israel. The Israeli video is perhaps the latest word on this controversial subject, and everyone with an interest in the genetic character of the Jewish people should watch it.








http://youtu.be/rTJFziTzOeg

Comments

Please tell us what you think

Name, website, and email are optional; if we publish your comment, your name will be shown, and may be linked to your website if provided, but the email you enter will not be published.





Captcha Image

 

 


Recent Posts


Tags

Europe haplogroup L seafaring Cleopatra Altai Turks mitochondrial DNA occipital bun Jewish genetics Scotland New York Review of Books London Austronesian, Filipinos, Australoid Oxford Nanopore Colin Pitchfork Mark Thomas Anne Marie Fine aliyah Barack Obama DNA Fingerprint Test Jews Khazars Panther's Lodge mental foramen Arabic corn human leukocyte testing Cismaru DNA testing companies Colin Renfrew Navajo Monya Baker Y chromosome DNA hominids Richard Lewontin Bering Land Bridge Abraham Lincoln Timothy Bestor Michael Schwartz clinical chemistry haplogroup J clan symbols Melungeon Movement Marija Gimbutas family history Cornwall Grim Sleeper India George Starr-Bresette Sinti Washington D.C. Bryony Jones Nikola Tesla Richard III Moundbuilders haplogroup T Wikipedia polydactylism PNAS Stephen Oppenheimer art history Holocaust research Israel archeology National Health Laboratories Phillipe Charlier Kentucky Greeks Albert Einstein College of Medicine Turkic DNA microsatellites Lab Corp Jewish GenWeb haplogroup E Horatio Cushman education Holocaust Database Roberta Estes NPR health and medicine Rare Genes Zizmer Wellcome Trust Sanger Institute Freemont Indians X chromosome Harold Sterling Gladwin Harold Goodwin Walter Plecker Sam Kean Pima Indians Charles Perou Russell Belk haplogroup B Abenaki Indians Cohen Modal Haplotype cancer Etruscans Miguel Gonzalez Cherokee DNA Middle Eastern DNA Magdalenian culture European DNA Maya Basques Waynesboro Pennsylvania Louis XVI Tom Martin Scroft B'nai Abraham Austro-Hungary Bureau of Indian Affairs Indo-Europeans Chuetas haplogroup Z Cajuns England Constantine Rafinesque race First Peoples history of science Wendell Paulson Leicester Chris Tyler-Smith haplogroup X Phoenicians Hopi Indians Melungeon Union Columbia University Caucasian rock art Finnish people Erika Chek Hayden Tifaneg New York Academy of Sciences Jews and Muslims in British Colonial America Stone Age Luca Pagani DNA security GlobalFiler Tucson FDA Dienekes Anthropology Blog Arizona State University Acadians linguistics Sorbs American Journal of Human Genetics Henry VII Barnard College Beringia ancient DNA Belgium hoaxes myths megapopulations INORA N. Brent Kennedy Shlomo Sand Ron Janke Egyptians methylation Arizona Terry Gross Genome Sciences Building Melungeons immunology FOX News Chris Stringer Melungeon Heritage Association anthropology haplogroup U prehistoric art haplogroup H Joseph Jacobs Pueblo Grande Museum Society for Crypto-Judaic Studies Penny Ferguson Valparaiso University Mary Settegast Keros surnames Bradshaw Foundation bar mitzvah Russia Nephilim, Fritz Zimmerman Anasazi Ancient Giantns Who Ruled America Tennessee BATWING Irish history Great Goddess Peter Parham crypto-Jews admixture Romania autosomal DNA Ananya Mandal Cooper surname Gregory Mendel Y chromosomal haplogroups Comanche Indians Janet Lewis Crain Kari Carpenter genomics labs Harry Ostrer Elzina Grimwood Solutreans Khoisan evolution Melanesians DNA Forums Native American DNA Test Ireland Melba Ketchum Ziesmer, Zizmor Bode Technology DNA Fingerprint Test King Arthur Sizemore surname Richard Dewhurst EURO DNA Fingerprint Test Bill Tiffee AP Zionism pheromones forensics Alabama breast cancer oncology Sea Peoples Hertfordshire prehistory FBI Nature Genetics Rush Limbaugh Oxford Journal of Evolution ethnic markers genetic determinism cannibalism Iran Svante Paabo The Nation magazine National Geographic Daily News Life Technologies Neolithic Revolution Richard Buckley Mary Kugler Paleolithic Age Slovakia Thuya Stacy Schiff Bentley surname research Applied Epistemology Philippa Langley Asian DNA Gunnar Thompson Phyllis Starnes Sarmatians population isolates Kate Wong ISOGG consanguinity Carl Zimmer Science magazine Science Daily, Genome Biol. Evol., Eran Elhaik, Khazarian Hypothesis, Rhineland Hypothesis Jack Goins Smithsonian Magazine Rafael Falk Hohokam Daily News and Analysis Wales Black Irish Nova Scotia Denisovans Normans ethics medicine Teresa Panther-Yates Helladic art personal genomics Jim Bentley James Shoemaker religion Neanderthals Britain Bryan Sykes 23andme climate change Middle Ages haplogroup R Micmac Indians University of Leicester MHC Plato university of North Carolina at Chapel Hill King Arthur, Tintagel, The Earliest Jews and Muslims of England and Wales David Cornish Anglo-Saxons Tintagel Nadia Abu El-Haj Maronites China Early Jews and Muslims of England and Wales (book) Marie Cheng Rutgers University Choctaw Indians andrew solomon Italy Black Dutch human migrations Celts North African DNA genetics Hohokam Indians African DNA George van der Merwede Monica Sanowar Zuni Indians French Canadians Alec Jeffreys population genetics Native American DNA John Wilwol Anacostia Indians Epigraphic Society Gila River Victor Hugo Lebanon rapid DNA testing Algonquian Indians Tutankamun Kurgan Culture DNA databases Clovis Ashkenazi Jews genetic memory Current Anthropology Jone Entine Eric Wayner statistics District of Columbia Chauvet cave paintings ethnicity French DNA news Riane Eisler Scientific American Havasupai Indians Theodore Steinberg American history Cancer Genome Atlas IntegenX DNA magazine Smithsonian Institution Akhenaten North Carolina phenotype genealogy Promega Population genetics Pomponia Graecina Henry IV Discover magazine Les Miserables Yates surname Bigfoot Sasquatch Ari Plost mummies palatal tori Michael Grant Henriette Mertz El Castillo cave paintings BBCNews Phoenix Roma People Chromosomal Labs Bode Technology Salt River HapMap far from the tree Majorca mutation rate human leukocyte antigens Sizemore Indians giants Fritz Zimmerman Israel, Shlomo Sand Virginia DeMarce powwows Gravettian culture Donald N. Yates When Scotland Was Jewish Wendy Roth Charles Darwin Gypsies Cave art origins of art Cismar Isabel Allende M. J. Harper alleles Discovery Channel Pueblo Indians haplogroup N epigenetics bloviators Jon Entine Patagonia Germany Nature Communications Stony Creek Baptist Church familial Mediterranean fever single nucleotide polymorphism Elizabeth C. Hirschman horizontal inheritance Telltown Arabia

Archive