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. 1994 Jan 18;91(2):723–727. doi: 10.1073/pnas.91.2.723

Allelic associations of two polymorphic microsatellites in intron 40 of the human von Willebrand factor gene.

S D Pena 1, K T de Souza 1, M de Andrade 1, R Chakraborty 1
PMCID: PMC43021  PMID: 8290589

Abstract

At intron 40 of the von Willebrand factor (vWF) gene, two GATA-repeat polymorphic sites exist that are physically separated by 212 bp. At the first site (vWF1 locus), seven segregating repeat alleles were observed in a Brazilian Caucasian population, and at the second (vWF2 locus) there were eight alleles, detected through PCR amplifications of this DNA region. Haplotype analysis of individuals revealed 36 different haplotypes in a sample of 338 chromosomes examined. Allele frequencies between generations and gender at each locus were not significantly different, and the genotype frequencies were consistent with their Hardy-Weinberg expectations. Linkage disequilibrium between loci is highly significant with positive allele size association; that is, large alleles at the loci tend to occur together, and so do the small alleles. Variability at each locus appeared to have arisen in a stepwise fashion, suggesting replication slippage as a possible mechanism of production of new alleles. However, we observed an increased number of haplotypes, in contrast with the predictions of a stepwise production of variation in the entire region, suggesting some form of "cooperative" changes between loci that could be due to either gene conversion, or a common control mechanism of production of new variation at these repeat polymorphism sites. The high degree of polymorphism (gene diversity values of 72% and 78% at vWF1 and vWF2, respectively, and of 93% at the haplotype level) makes these markers informative for paternity testing, genetic counseling, and individual-identification purposes.

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