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Nat Genet. 2004 Apr;36(4):394-9. Epub 2004 Mar 28.

Allele-specific repression of lymphotoxin-alpha by activated B cell factor-1.

Author information

1
Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK. julian@well.ox.ac.uk

Abstract

Genetic variation at the human LTA locus, encoding lymphotoxin-alpha, is associated with susceptibility to myocardial infarction, asthma and other diseases. By detailed haplotypic analysis of the locus, we identified a single-nucleotide polymorphism (SNP) at LTA+80 as a main predictor of LTA protein production by human B cells. We found that activated B-cell factor-1 (ABF-1) binds to this site in vitro and suppresses reporter gene expression, but only in the presence of the LTA+80A allele. Using haplotype-specific chromatin immunoprecipitation, we confirmed that ABF-1 is preferentially recruited to the low-producer allele in vivo. These findings provide a molecular model of how LTA expression may be genetically regulated by allele-specific recruitment of the transcriptional repressor ABF-1.

PMID:
15052269
DOI:
10.1038/ng1331
[Indexed for MEDLINE]

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