Abstract:
:Cells from persons with Bloom syndrome feature an elevated rate of sister-chromatid exchange (SCE). However, in some affected persons a minority of blood lymphocytes have a normal SCE rate. Persons who inherit the Bloom syndrome gene BLM identical by descent from a common ancestor very rarely exhibit this high-SCE/low-SCE mosaicism; conversely, mosaicism arises predominantly in persons who do not share a common ancestor. These population data suggested that most persons with Bloom syndrome in whom the exceptional low-SCE cells arise are not homozygous for a mutation at BLM but instead are compound heterozygotes. Following this clue, we carried out a genotype analysis of loci syntenic with BLM in 11 persons who exhibited mosaicism. In five of them, polymorphic loci distal to BLM that were heterozygous in their high-SCE cells had become homozygous in their low-SCE cells, whereas heterozygous loci proximal to BLM remained heterozygous. These observations are interpreted to mean that intragenic recombination between paternally derived and maternally derived mutated sites within BLM can generate a functionally wild-type gene and that low-SCE lymphocytes are progeny of a somatic cell in which such intragenic recombination had occurred.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Ellis NA,Lennon DJ,Proytcheva M,Alhadeff B,Henderson EE,German Jsubject
Has Abstractpub_date
1995-11-01 00:00:00pages
1019-27issue
5eissn
0002-9297issn
1537-6605journal_volume
57pub_type
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