Cloning and characterization of cDNAs expressed during chick development and encoding different isoforms of a putative zinc finger transcriptional regulator.
Development proceeds through successive activation of different sets of genes by specific transcription factors as a consequence of cell interactions and signaling. It is thus of primary interest to identify new putative transcriptional regulators. We report here the isolation of chicken clones bearing sequences coding for a chicken zinc finger protein (chZFp) which contains four pairs of zinc fingers of mixed type C2-H-C/C2-H2. At least five chZFp isoforms are produced through differential splicing of four small exons. The amino acid domains encoded by these four exons are highly conserved across species. Northern blot analysis and RNase-protection assays showed that chZFp transcripts are present in brain, heart, skin and liver during chick development. Reverse transcription mediated polymerase chain reaction (RT-PCR) experiments suggested that the relative amount of some chZFp isoforms increases at critical stages of development and skin morphogenesis. Finally, the main chZFp isoforms are able to directly interact in vitro with the scaffold attachment factor-A (SAF-A, also known as heterogenous nuclear ribonucleoprotein U) through both their aminoterminal and carboxyterminal domains.
Michaille
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JJ
Développement, communication chimique, CNRS-UMR 5548, faculté Gabriel, 6, boulevard Gabriel, 21000 Dijon, France. Jean-Jacques.Michaille@u-bourgogne.fr
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D017398:Alternative Splicing / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000196:embryology; D002467:Cell Nucleus / Q000378:metabolism; D002642:Chick Embryo; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics*; D018507:Gene Expression Regulation, Developmental; D006321:Heart / Q000196:embryology; D034722:Heterogeneous-Nuclear Ribonucleoprotein U / Q000378:metabolism; D008099:Liver / Q000196:embryology; D051379:Mice; D008969:Molecular Sequence Data; D041681:NIH 3T3 Cells; D020033:Protein Isoforms / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D050436:Regulatory Elements, Transcriptional / Q000235:genetics*; D012867:Skin / Q000196:embryology; D016335:Zinc Fingers / Q000235:genetics*
D018076:DNA, Complementary; D034722:Heterogeneous-Nuclear Ribonucleoprotein U; D020033:Protein Isoforms