Monday, March 29, 2010

Genetic structure Blacks in ancient Mesoamerica

If Africans early colonized the Americas there was be genetic evidence supporting their ancient presence. Evidence which should exist today in Amerindian populations.

Lisker et al, noted that “The variation of Indian ancestry among the studied Indians shows in general a higher proportion in the more isolated groups, except for the Cora, who are as isolated as the Huichol and have not only a lower frequency but also a certain degree of black admixture. The black admixture is difficult to explain because the Cora reside in a mountainous region away from the west coast”.

Green et al (2000) also found Indians with African genes in North Central Mexico, including the L1 and L2 clusters. Green et al (2000) observed that the discovery of a proportion of African haplotypes roughly equivalent to the proportion of European haplotypes [among North Central Mexican Indians] cannot be explained by recent admixture of African Americans for the United States. This is especially the case for the Ojinaga area, which presently is, and historically has been largely isolated from U.S. African Americans. In the Ojinaga sample set, the frequency of African haplotypes was higher that that of European hyplotypes”.

The genetic evidence for Africans among the Mexicans is quite interesting. This evidence supports the skeletal evidence that Africans have lived in Mexico for thousands of years.

The foundational mtDNA lineages for Mexican Indians are lineages A, B, C and D.The frequencies of these lineages vary among population groups. For example, whereas lineages A,B and C were present among Maya at Quintana Roo, Maya at Copan lacked lineages A and B (Gonzalez-Oliver, et al, 2001). This supports Carolina Bonilla et al (2005) view that heterogeneity is a major characteristic of Mexican population.

Underhill, et al (1996) noted that:" One Mayan male, previously [has been] shown to have an African Y chromosome." This is very interesting because the Maya language illustrates a Mande substratum, in addition to African genetic markers. James l. Gutherie (2000) in a study of the HLAs in indigenous American populations, found that the Vantigen of the Rhesus system, considered to be an indication of African ancestry, among Indians in Belize and Mexico centers of Mayan civilization. Dr. Gutherie also noted that A*28 common among Africans has high frequencies among Eastern Maya. It is interesting to note that the Otomi, a Mexican group identified as being of African origin and six Mayan groups show the B Allele of the ABO system that is considered to be of African origin.

Amerindians carry the X hg. Amerindians and Europeans hg X are different (Person, 2004). Haplogroup X has also been found throughout Africa (Shimada et al,2006). Shimada et al (2006) believes that X(hX) is of African origin. Amerindian X is different from European hg X, skeletons from Brazil dating between 400-7000 BP have the transition np 16223 ( Martinez-Cruzado, 2001; Ribeiro-Dos-Santos,1996). Transition np 16223 is characteristic of African haplogroups. This suggest that Africans may have taken the X hg to the Americas in ancient times.

Some researchers claim that as many as seventy-five percent of the Mexicans have an African heritage (Green et al, 2000). Although this may be the case Cuevas (2004) says these Africans have been erased from history.


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