Genomic organization of the X-linked inhibitor of apoptosis and identification of a novel testis-specific transcript.
2001
Abstract Here we report the genomic organization and mapping of the X-linked inhibitor of apoptosis gene ( BIRC4 , also known as XIAP and hILP ) and the identification of a closely related transcript. BIRC4 is located on Xq25 and is composed of seven exons.The intron/exon structure is highly conserved between the mouse homologue and its human counterpart. Four bands cross-react with a BIRC4 coding region probe on a genomic Southern blot. One of these cross-reactive bands encodes an intronless gene that expresses a 2.2-kb transcript solely in the testis. This testis-specific transcript contains a putative open reading frame (ORF) that is homologous to the carboxy-terminal end of BIRC4 ; overexpression of this ORF shows protective effects against BAX-induced apoptosis.
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