Histone acetylation dependent allelic expression imbalance of BAPX1 in patients with the oculo-auriculo-vertebral spectrum.

Abstract:

:The oculo-auriculo-vertebral spectrum (OAVS) (OMIM % 164210) is a common developmental disorder characterized by hemifacial microsomia, epibulbar tumours, ear malformation and vertebral anomalies. Although rare familial cases suggest that OAVS has a genetic basis, no genetic defect has been identified so far. In a patient with OAVS and a chromosomal translocation t(4;8) we have found that the chromosome 4 breakpoint is 76.4 kb distal to the BAPX1 gene, which plays an essential role in craniofacial development. We did not detect any BAPX1 mutation in 105 patients, but observed a strong allelic expression imbalance (sAEI) in fibroblasts from five of 12 patients, but not in nine normal controls (Fisher's exact test, P=0.038). sAEI was de novo in one patient and inherited in two other patients. Prolonged cell culture or treatment with the histone deacetylase inhibitor Trichostatin A led to reactivation of the downregulated allele. We propose that epigenetic dysregulation of BAPX1 plays an important role in OAVS.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Fischer S,Lüdecke HJ,Wieczorek D,Böhringer S,Gillessen-Kaesbach G,Horsthemke B

doi

10.1093/hmg/ddi474

subject

Has Abstract

pub_date

2006-02-15 00:00:00

pages

581-7

issue

4

eissn

0964-6906

issn

1460-2083

pii

ddi474

journal_volume

15

pub_type

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