Patterns of haplotype diversity within the serpin gene cluster at 14q32.1: insights into the natural history of the alpha 1-antitrypsin polymorphism

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

Seixas, S (Autor) Outra; Garcia, O (Autor) Outra; Trovoada, MJ (Autor) Outra; Santos, MT (Autor) Outra; Amorim, A (Autor) FCUP; Rocha, J (Autor) FCUP

Revista

Título: Human Genetics

Vol. 108

Páginas: 20-30

ISSN: 0340-6717

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 40 Citações

Scopus - 52 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

Outras Informações

ID Authenticus: P-000-X60

DOI: 10.1007/s004390000434

Abstract (EN): The levels of haplotype diversity associated with different alpha1-antitrypsin (PI) alleles were assessed by the analysis of three microsatellites located within or close to corticosteroid-binding globulin (CBG), alpha1-antitrypsin [PI-(TG)(n)] and protein C inhibitor [PCI-(TG)(n)] loci in three populations with different historic backgrounds: Portugal, the Basque Country and Sao Tome e Principe (Gulf of Guinea). Unlike the more distant PCI-(TCT)(n) repeat, allelic variation at PI-(TG), reflected distinct phases of mutational recovery of microsatellite diversity around different founder alleles and showed a considerable differentiation between alpha1-antitrypsin protein variants. In accordance with population history, the Basque sample presented overall reduced levels of microsatellite variation. The African sample, although presenting the highest PCI-(TG),, diversity, showed a lineage-specific reduction in PI-(TG), heterozygosity within the oldest M1Ala213 variant that could have been caused by (1) selection at a closely linked locus or (2) biases in the microsatellite mutation process leading to a stable equilibrium distribution. Age estimates of al-antitrypsin variants based on microsatellite variation suggest that the Z deficiency allele appeared 107-135 generations ago and could have been spread in Neolithic times. The S mutation has an older 279- to 470-generation age, indicating that its high frequencies in Iberia did not result from a recent bottleneck and that PI*S could have originated in this region. M2 and M3 types had lower age estimates than would be expected from their wide geographical distributions, suggesting that their dispersion in Europe might have been preceded by important bottlenecks.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11