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    Genomics. 1991 Aug;10(4):985-95.

    Isolation, characterization, and localization of human genomic DNA encoding the beta 1 subunit of the GABAA receptor (GABRB1).

    Kirkness EF, Kusiak JW, Fleming JT, Menninger J, Gocayne JD, Ward DC, Venter JC.

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    Section of Receptor Biochemistry and Molecular Biology, NINDS, NIH, Bethesda, Maryland 20892.

    Abstract

    Genomic DNA that encodes the beta 1 subunit of the human gamma-aminobutyric acidA (GABAA) receptor was cloned and mapped. Exons and flanking introns (greater than 14 kb) were sequenced to determine the structural organization of the gene. The gene was localized on human chromosome 4, in bands p12-13. The beta 1 subunit is encoded by a relatively large gene (greater than 65 kb) on nine exons. In contrast to other conserved regions of the subunit polypeptide, the proposed channel-forming domain (M2) is derived from more than one exon. The organization of exons was compared with that of the genes that code for subunits of nicotinic acetylcholine receptors. There is no evidence for conservation of gene structure between these two members of the proposed gene superfamily. However, intron-exon junctions were found to be conserved precisely between subtypes of GABAA receptor subunits.

    PMID:
    1655634
    [PubMed - indexed for MEDLINE]

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