Abstract:
:We previously showed that the human AKNA gene encodes an AT-hook transcription factor that regulates the expression of costimulatory cell surface molecules on lymphocytes. However, AKNA cDNA probes hybridize with multiple transcripts, suggesting either the existence of other homologous genes or a complex regulation operating on a single gene. Here we report evidence for the latter, as we find that AKNA is encoded by a single gene that spans a 61-kb locus of 24 exons on the fragile FRA9E region of human chromosome 9q32. This gene gives rise to at least nine distinct transcripts, most of which are expressed in a tissue-specific manner in lymphoid organs. Many of the AKNA transcripts originate from alternative splicing; others appear to derive from differential polyadenylation and promoter usage. The alternative AKNA transcripts are predicted to encode overlapping protein isoforms, some of which (p70 and p100) are readily detectable using a polyclonal anti-AKNA antisera that we generated. We also find that AKNA PEST-dependent cleavage into p50 polypeptides is targeted to mature B cells and appears to be required for CD40 upregulation. The unusual capacity of the AKNA gene to generate multiple transcripts and proteins may reflect its functional diversity, and it may also provide a fail-safe mechanism that preserves AKNA expression.
journal_name
DNA Cell Bioljournal_title
DNA and cell biologyauthors
Sims-Mourtada JC,Bruce S,McKeller MR,Rangel R,Guzman-Rojas L,Cain K,Lopez C,Zimonjic DB,Popescu NC,Gordon J,Wilkinson MF,Martinez-Valdez Hdoi
10.1089/dna.2005.24.325keywords:
subject
Has Abstractpub_date
2005-05-01 00:00:00pages
325-38issue
5eissn
1044-5498issn
1557-7430journal_volume
24pub_type
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