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Nucleic Acids Research, 2002, Vol. 30, No. 12 e62
© 2002 Oxford University Press

Direct micro-haplotyping by multiple double PCR amplifications of specific alleles (MD-PASA)

Yuval Eitan and Yechezkel Kashi*

Department of Food Engineering and Biotechnology, Technion – Israel Institute of Technology, Haifa 32000, Israel

Analysis of haplotypes is an important tool in population genetics, familial heredity and gene mapping. Determination of haplotypes of multiple single nucleotide polymorphisms (SNPs) or other simple mutations is time consuming and expensive when analyzing large populations, and often requires the help of computational and statistical procedures. Based on double PCR amplification of specific alleles, described previously, we have developed a simple, rapid and low-cost method for direct haplotyping of multiple SNPs and simple mutations found within relatively short specific regions or genes (micro-haplotypes). Using this method, it is possible to directly determine the physical linkage of multiple heterozygous alleles, by conducting a series of double allele-specific PCR amplification sets with simple analysis by gel electrophoresis. Application of the method requires prior information as to the sequence of the segment to be haplotyped, including the polymorphic sites. We applied the method to haplotyping of nine sites in the chicken HSP108 gene. One of the haplotypes in the population apparently arose by recombination between two existing haplotypes, and we were able to locate the point of recombination within a segment of 19 bp. We anticipate rapidly growing needs for SNP haplotyping in human (medical and pharmacogenetics), animal and plant genetics; in this context, the multiple double PCR amplifications of specific alleles (MD-PASA) method offers a useful haplotyping tool.

* To whom correspondence should be addressed. Tel: +972 4 8293074; Fax: +972 4 8320742; Email: kashi{at}tx.technion.ac.il


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