MisterLawyer
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Joined: 02 May 2006
{Posts: 444 }
Location: Īle-de-France
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 Posted: Sat 25 Oct 2008 13:51 Post subject: |
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| Quote: | Latest DNA test in the DR show that approximately 15 to 18% of the curent Dominican population can trace their matrilineal heritage to the Tainos.
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In the article, the number quoted in the above quote are said to be preliminary results. I doubt their accuracy based on this article:
http://www.citeulike.org/user/Archaeogenetics/article/854110
From said article: | Quote: | | People in the Dominican Republic are considered to be genetically heterogeneous owing to the post-Colombian admixture of Native American, African, and European populations. To characterize their genetic background, nucleotide sequences of the D-loop region of human mitochondrial DNA (mtDNA) were examined in 33 healthy women and 50 gender-matched patients with obese type 2 diabetes (OD) from the Dominican Republic. Phylogenetic analysis of 198 mtDNA lineages including Native Americans, Africans, and Europeans enabled us to assess relative genetic contributions of the three ancestral fractions to the two groups in the Dominican Republic. In the OD group, the majority (64.0%) of the mtDNA lineages were from African ancestry, whereas the Native American fraction was predominant (51.5%) in the healthy group, with both showing smallest amounts (14.0% and 9.1%, respectively) of European contribution. This difference in maternal genetic background between the two groups was similarly demonstrated by phylogenetic analysis at the population level based on net nucleotide diversities between populations. These findings may imply ethnic-specific predisposition to OD, a possible association of an unidentified factor from African ancestry with OD in the Dominican Republic population |
If their control group was selected appropriately, you could expect over 50% native mitochondria. However, it is also a small sample and should be taken with a grain of salt until a population wide study is conducted.
Also, from the second linked provided above:
| Quote: | | The study indicates that not only do a high percenatge of Dominicans have Taino ancestry but also that it appears that the Native ancestry in the Cibao region was relatively "un-mixed" up to recent times. This is deduced by the fact that in many areas in the Cibao the mitochondrial DNA was at an astonoshing 90%. |
This quote in blue is not necessarily correct . In my opinion, the high percentage of native mitochondria is more likely a reflection of amerind/european sex bias in colonial reproductive patterns followed by relative isolation of the population since that time. A analogous situation exists in Antioquia, Colombia, where greater than 90% of the mitochondrial lineages are native, and greater that 90% of the Y chromosome lineages are european.
This could be confirmed by a Y chromosome survey in the Cibao. I would expect a similar situation to Antioquia, except with a greater African contribution to the Y chromosome pool, but never the less with a low contribution, probably less than 10%, from native males.
A link to the Antioquia study:
http://cat.inist.fr/?aModele=afficheN&cpsidt=798612 |
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