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Identification of a novel splice variant of X-linked inhibitor of apoptosis-associated factor 1.

Abstract：

:XAF1 (XIAP-associated factor 1) binds to XIAP and blocks its anti-apoptotic activity. It has been reported that XAF1 is mainly expressed in normal tissues but is missing or present at low levels in most cancer cell lines, which implies a tumor-suppressing function. In the present study we describe the identification of a novel splice variant of human XAF1, designated XAF1C, which contains a cryptic exon. Incorporation of this exon (exon 4b) into the mRNA introduces an in-frame stop codon, resulting in a shortened open-reading frame (ORF) of 495 nucleotides. This ORF is predicted to encode a 164 amino acid (AA) protein lacking the C-terminal domain of the previously described XAF1(A), but containing a unique 24 AA carboxy terminus. Like XAF1(A), XAF1C mRNA expression was detected in a variety of human cancer cell lines and also in normal human tissues. The ratio of XAF1(A) and XAF1C mRNA expression differs amongst the cell lines tested, suggesting differential mRNA stabilities and/or the existence of tissue- or cell type-specific splicing regulation. In transfected cells, xaf1c encodes a truncated protein of 18kDa, which is distributed primarily in the nucleus.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Yin W,Cheepala S,Clifford JL

doi

10.1016/j.bbrc.2005.11.128

subject

Has Abstract

pub_date

2006-01-27 00:00:00

pages

1148-54

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)02639-2

journal_volume

339

pub_type

杂志文章

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