Factor IX gene haplotypes in Brazilian blacks and characterization of unusual DdeI alleles.

Abstract:

:Analysis of factor IX gene polymorphisms is considered the best approach for prenatal diagnosis and carrier detection of haemophilia B when the identification of the gene mutation is not possible. Studies involving factor IX gene polymorphisms in Black populations are scarce and essentially restricted to the North-American Black population whose composition is substantially different from that of the Brazilian and presumably other Black populations of South America. In this paper we report the analysis of eight factor IX gene polymorphisms in Brazilian Blacks: 5' BamHI, DdeI, intron 2 BamHI, XmnI, TaqI, TaqI, MspI, MnlI and HhaI. Characterization of the VNTR-like DdeI polymorphism revealed six different alleles: B, AB, A2B, A2B2, A3B and A5B, the last being described here for the first time. The 5' BamHI, DdeI, MspI and HhaI polymorphisms showed the highest heterozygosities (0.40-0.50) and are in linkage equilibrium with one another. 19 complete haplotypes could be identified in this population. Based on the results we propose a systematic strategy for carrier detection and prenatal diagnosis of haemophilia B in this population. The combined analysis of four polymorphisms (5' BamHI, HhaI, MspI and DdeI) provided an informative genetic marker in 85% of the females. The use of all eight polymorphisms allows information in 95% of females. Additionally, differences in gene frequencies and haplotype distribution suggest dissimilarities in factor IX gene polymorphisms between the Brazilian and the North-American Black populations.

journal_name

Br J Haematol

authors

Figueiredo MS,Bowen DJ,Silva Júnior WA,Zago MA

doi

10.1111/j.1365-2141.1994.tb06739.x

subject

Has Abstract

pub_date

1994-08-01 00:00:00

pages

789-96

issue

4

eissn

0007-1048

issn

1365-2141

journal_volume

87

pub_type

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