Abstract:
:Nijmegen breakage syndrome (NBS; Seemanová II syndrome) and Berlin breakage syndrome (BBS), also known as ataxia-telangiectasia variants, are two clinically indistinguishable autosomal recessive familial cancer syndromes that share with ataxia-telangiectasia similar cellular, immunological, and chromosomal but not clinical findings. Classification in NBS and BBS was based on complementation of their hypersensitivity to ionizing radiation in cell-fusion experiments. Recent investigations have questioned the former classification into two different disease entities, suggesting that NBS/BBS is caused by mutations in a single radiosensitivity gene. We now have performed a whole-genome screen in 14 NBS/BBS families and have localized the gene for NBS/BBS to a 1-cM interval on chromosome 8q21, between markers D8S271 and D8S270, with a peak LOD score of 6.86 at D8S1811. This marker also shows strong allelic association to both Slavic NBS and German BBS patients, suggesting the existence of one major mutation of Slavic origin. Since the same allele is seen in both former complementation groups, genetic homogeneity of NBS/BBS can be considered as proved.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Saar K,Chrzanowska KH,Stumm M,Jung M,Nürnberg G,Wienker TF,Seemanová E,Wegner RD,Reis A,Sperling Ksubject
Has Abstractpub_date
1997-03-01 00:00:00pages
605-10issue
3eissn
0002-9297issn
1537-6605journal_volume
60pub_type
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