Una hipótesis evolutiva sobre la ausencia del antígeno (Di-a) en Amerindios chibchas
Fecha
1990
Tipo
artículo original
Autores
Barrantes Mesén, Ramiro
Título de la revista
ISSN de la revista
Título del volumen
Editor
Resumen
Se estudiaron 141 tribus amerindias de todo
el continente y esquimales de Alaska y Canadá
en relación con el grupo sanguíneo Diego. Se
encontró que 26 (18%) no presentaron el antígeno
Di-a y de estas 20 (77%) pertenecían al
Phylum lingüístico Chibcha. En el pasado se
ha explicado la ausencia de Di-a en un contexto
ecológico al relacionar este fenómeno con el
clima y con la presencia de climas según la latitud.
Aquí se presenta una explicación alternativa,
por la pérdida del alelo Di-a en el proceso
de divergencia de los grupos Chibchas, ocurrida
hace 6000-7000 ai5os, por procesos aleatorios
y no por selección natural. Se postula que
la ausencia de Di-a está circunscrita a este grupo
amerindio y que su presencia en cuatro tribus
(Boruca, lea, Kuna y Sumo) se atribuye al
efecto de flujo génico relativamente reciente
con tribus vecinas de diferente lenguaje y portadores
del antígeno.
Diego blood group was studied in 141 Amerindian and Eskimo tribes from Alaska and Canada. Twenty six tribes (18%) did not show the Di-a antigen and 20 tribes (77%) were of the Chibeha linguistic Phyla. In the past, the Di-a absence has been related to several ecological factors such as climate and the presence of clines. 1 advance an alternative explanation regarding the 10ss of the Di-a allele in the Chibeha genetic divergence wich ocurred 60-700 years ago, as a consequence of random processes and not of natural selection. It is postulated that the Di-a allele is absent in this Amerindian groups only, and that the presence of the antigen in four tribes (Boruca, Ica,Kuna and Sumo) is due to gene flow across neighboring groups of diferent languages wich carry the Di-a antigen.
Diego blood group was studied in 141 Amerindian and Eskimo tribes from Alaska and Canada. Twenty six tribes (18%) did not show the Di-a antigen and 20 tribes (77%) were of the Chibeha linguistic Phyla. In the past, the Di-a absence has been related to several ecological factors such as climate and the presence of clines. 1 advance an alternative explanation regarding the 10ss of the Di-a allele in the Chibeha genetic divergence wich ocurred 60-700 years ago, as a consequence of random processes and not of natural selection. It is postulated that the Di-a allele is absent in this Amerindian groups only, and that the presence of the antigen in four tribes (Boruca, Ica,Kuna and Sumo) is due to gene flow across neighboring groups of diferent languages wich carry the Di-a antigen.
Descripción
Artículo científico -- Universidad de Costa Rica. Instituto de Investigaciones en Salud, 1990
Palabras clave
Di-a antigen, climate, Chibcha amerindians, genetic drift, Genética humana, Hábitat