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Tanzania: might be an ancient source of dispersal of modern humans in the world!

Discussion in 'Habari na Hoja mchanganyiko' started by Mama, May 4, 2008.

  1. M

    Mama JF-Expert Member

    #1
    May 4, 2008
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    Studies of human mitochondrial (mt) DNA genomes demonstrate that the root of the human phylogenetic tree occurs in Africa. Although 2 mtDNA lineages with an African origin (haplogroups M and N) were the progenitors of all non-African haplogroups, macrohaplogroup L (including haplogroups L0-L6) is limited to sub-Saharan Africa. Several L haplogroup lineages occur most frequently in eastern Africa (e.g., L0a, L0f, L5, and L3g), but some are specific to certain ethnic groups, such as haplogroup lineages L0d and L0k that previously have been found nearly exclusively among southern African "click" speakers. Few studies have included multiple mtDNA genome samples belonging to haplogroups that occur in eastern and southern Africa but are rare or absent elsewhere. This lack of sampling in eastern Africa makes it difficult to infer relationships among mtDNA haplogroups or to examine events that occurred early in human history. We sequenced 62 complete mtDNA genomes of ethnically diverse Tanzanians, southern African Khoisan speakers, and Bakola Pygmies and compared them with a global pool of 226 mtDNA genomes. From these, we infer phylogenetic relationships amongst mtDNA haplogroups and estimate the time to most recent common ancestor (TMRCA) for haplogroup lineages. These data suggest that Tanzanians have high genetic diversity and possess ancient mtDNA haplogroups, some of which are either rare (L0d and L5) or absent (L0f) in other regions of Africa. We propose that a large and diverse human population has persisted in eastern Africa and that eastern Africa may have been an ancient source of dispersion of modern humans both within and outside of Africa.

    Gonder MK, Mortensen HM, Reed FA, de Sousa A, Tishkoff SA.2007.Whole-mtDNA genome sequence analysis of ancient African lineages. Mol Biol Evol. 24(3):757-68.
     
  2. R

    Rubabi Senior Member

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    May 4, 2008
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    Studies karibu zote zime prove without a doubt kuwa east afrika, kenya tanzania,ethiopia ndio mwanzo wa binadamu tunaowaona leo, homo sapien sapien.

    Hawa binadamu walikuwa waafrika kama sisi wakapitia ethiopia wakaenda mpaka middleast eventually kuijaza dunia nzima.

    Mazingara tofauti katika maeneo hayo mbalimbali ya dunia ndio yalisababisha binadamu hao wabadilike rangi, sura n.k.

    Kwahiyo binadamu original ni mwafrika,wengine ni copy au mutations ya hawa waafrika, ndio maana DNA imeonyesha kuwa koo zote zilizoko nje ya afrika ni subset ya koo zinazooneka afrika hasa east afrika.
     
  3. M

    Mama JF-Expert Member

    #3
    May 4, 2008
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    kwa hiyo nami nikikaa huku ughaibuni nitabadilika niwe kama wenyeji, au wanangu ndio watabadilika kulingana na mazingira haya?
     
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