Human Molecular Genetics, Vol 7, 363-369, Copyright © 1998 by Oxford University Press
NL White, CF Higgins and AE Trezise
The in vivo transcription start sites of the human cystic fibrosis
transmembrane conductance regulator gene ( CFTR ) and its murine homologue
( Cftr ) have been mapped in a range of tissues using the technique of 5'
rapid amplification of cDNA ends (5' RACE). These are the first in vivo
transcription start sites for CFTR or Cftr to be reported. Distinct,
tissue-specific patterns of CFTR start site usage were identified in both
mouse and human. In particular, striking variation in the position of the
murine Cftr transcription start site was seen along the length of the
intestinal tract; different start sites being utilized in ileum and in
duodenum. In humans, distinct transcription start sites are utilized in
adult and foetal lungs. In addition, a novel 5'-untranslated exon of murine
Cftr , denoted exon - 1, was identified and shown to be expressed
exclusively in mouse testis. Expression of exon -1-containing Cftr
transcripts was shown by mRNA in situ hybridization to be confined to the
germ cells and to be regulated during spermatogenesis.
ARTICLES
Tissue-specific in vivo transcription start sites of the human and murine cystic fibrosis genes
Nuffield Department of Clinical Biochemistry and Imperial Cancer Research Fund Laboratories, Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, UK.
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