Genetic Flux Between H1 and H2 Haplotypes of the 17q21.31 Inversion in European Population
10.1016/S 1672-0229(11)60014-4
- Author:
Deng LIBIN
1
,
2
,
3
;
Tang XIAOLI
;
Hao XIANGWEN
;
Chen WEI
;
Lin JIARI
;
Yu YANGYU
;
Zhang DAKE
;
Zeng CHANGQING
Author Information
1. Faculty of Basic Medical Science, Nanchang University, Nanchang 330006, China
2. Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing 100029, China
3. Institute of Translational Medicine, Nanchang University, Nanchang 330006, China
- Keywords:
genetic flux;
inversion;
haplotype;
polymorphism
- From:
Genomics, Proteomics & Bioinformatics
2011;09(3):113-118
- CountryChina
- Language:Chinese
-
Abstract:
The chromosome 17q21.31 inversion is a 900-kb common structural polymorphism found primarily in European population. Although the genetic flux within inversion region was assumed to be considerable suppressed, it is still unclear about the details of genetic exchange between the H1 (non-inverted sequence) and H2 (inverted sequence)haplotypes of this inversion. Here we describe a refined map of genetic exchanges between pairs of gene arrangements within the 17q21.31 region. Using HapMap phase Ⅱ data of 1,546 single nucleotide polymorphisms, we successfully deduced 96 H1 and 24 H2 haplotypes in European samples by neighbor-joining tree reconstruction. Furthermore, we identified 15 and 26 candidate tracts with reciprocal and non-reciprocal genetic exchanges, respectively.In all 15 regions harboring reciprocal exchange, haplotypes reconstructed by clone sequencing did not support these exchange events, suggesting that such signals of exchange between two sister chromosomes in certain heterozygous individual were caused by phasing error regions. On the other hand, the finished clone sequencing across 4 of 26 tracts with non-reciprocal genetic flux confirmed that this kind of genetic exchange was caused by gene conversion.In summary, as crossover between pairs of gene arrangements had been considerably suppressed, gene conversion might be the most important mechanism for genetic exchange at 17q21.31.
