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. 1994 Jul 5;91(14):6669–6673. doi: 10.1073/pnas.91.14.6669

Bloom syndrome: an analysis of consanguineous families assigns the locus mutated to chromosome band 15q26.1.

J German 1, A M Roe 1, M F Leppert 1, N A Ellis 1
PMCID: PMC44264  PMID: 8022833

Abstract

By the principle of identity by descent, parental consanguinity in individuals with rare recessively transmitted disorders dictates homozygosity not just at the mutated disease-associated locus but also at sequences that flank that locus closely. In 25 of 26 individuals with Bloom syndrome examined whose parents were related, a polymorphic tetranucleotide repeat in an intron of the protooncogene FES was homozygous, far more often than expected (P < 0.0001 by chi 2). Therefore, BLM, the gene that when mutated gives rise to Bloom syndrome, is tightly linked to FES, a gene whose chromosome position is known to be 15q26.1. This successful approach to the assignment of the Bloom syndrome locus to one short segment of the human genome simultaneously (i) demonstrates the power of homozygosity mapping and (ii) becomes the first step in a "reverse" genetics definition of the primary defect in Bloom syndrome.

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