terça-feira, 2 de março de 2010

H1 mtDNA 16262T 16278T HVR1 as a genetic signature of the Portuguese maritime expansion

I have the rare HVR1 16262T 16278T 16519C mtDNA belonging to haplogroup H1

Frequencies of the rare 16262T, 16278T motif in three different databases:

SMGF Brazil 1348/2 (Rio de Janeiro and Santa Catarina)
FTDNA 430/2 Portugal (Brazil and USA with documented genealogies to the Ribeirinha, Terceira, Açores, Azores)
Terceira Island 18/2, Azores (total) 120/2
Mitochondrial DNA patterns in the Macaronesia islands: Variation within and among archipelagos

In the H1 FGS Project the next close match (without the rare 16262T) is RY9WZ from Valladolid, Spain at the cluster Z1a, but there’s a good distance. So that’s an old Iberian lineage

The 16262T 16278T motif seems to be related to a single woman as a founder colonist in the Terceira Island, Azores. That’s a presumable representative of the first Atlantic embarked European mtDNA in the 15th century and it’s an ethnic and national genetic signature of the old Portuguese Empire. Usually the Portuguese haplotypes are distinctively found clustered only in the Western Iberian Portuguese speaking areas and in the main Colony of Brazil as their big territorial expansion.

The theory of sampling obeys the principle of statistical regularity and the 16262T 16278T mtDNA genetic signature presents specific frequencies and the haplotypes can be analyzed as a more or less regular percentage found in diverse samples from the Azorean and Brazilian populations.

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