Nucleic Acids Research, 2002, Vol. 30, No. 2 463-467
© 2002 Oxford University Press
The chicken lysozyme chromatin domain contains a second, widely expressed gene
Department of Biology, Beckman Research Institute of the City of Hope, Duarte, CA 91010, USA and 1Molecular Medicine Unit, St James University Hospital, University of Leeds, Leeds LS9 7TF, UK
The chicken lysozyme (cLys) locus has been shown to contain all of the cis-elements necessary for position-independent and tissue-specific expression entirely within a 24-kb region defined by general DNase I sensitivity and flanked by matrix attachment regions. As such, it has been viewed as an example of a functional chromatin domain, which is structurally and functionally isolated from neighbouring chromatin. We report here the identification and characterisation of the chicken glioma-amplified sequence (cGas41) locus, which though widely expressed, is contained entirely within the lysozyme chromatin domain. The cGas41 transcript encodes a putative transcription factor, starts 207 bp downstream of the cLys polyadenylation site and is preceded by a CpG island with proposed dual promoter/origin function. The location and differential expression of cGas41 compels re-evaluation of the accumulated literature on the lysozyme domain, and represents an example of two unrelated, differentially expressed vertebrate genes coexisting in the same functional chromatin domain.
* To whom correspondence should be addressed. Tel: +44 113 206 5676; Fax: +44 113 244 4475; Email: c.bonifer{at}leeds.ac.uk
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