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XB-ART-26309
EMBO J 1989 Dec 20;813:4091-7. doi: 10.1002/j.1460-2075.1989.tb08593.x.
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Differential expression of two Xenopus c-myc proto-oncogenes during development.

Vriz S , Taylor M , Méchali M .


Abstract
Two distinct Xenopus c-myc cDNA clones have been characterized from an oocyte cDNA library. This allowed a comparison of the c-myc protein sequence across the vertebrate phylum to be made and prominent conservations to be identified. The majority of the sequence differences between the two Xenopus c-myc cDNAs are in the 5' and 3' untranslated regions. Sequence-specific oligonucleotide probes from the 5' untranslated region were used to demonstrate the differential expression of the two c-myc mRNAs during development. One of the mRNAs corresponds to the Xenopus c-myc gene previously reported expressed as a stable maternal mRNA uncoupled from cell division during oogenesis (c-myc I). It is the major mRNA species expressed during oogenesis and is expressed again from the zygotic genome in post-gastrula embryos. In contrast, the second c-myc mRNA (c-myc II) is expressed only from the maternal genome during oogenesis. Primer extension experiments show that in the oocyte the transcriptional initiation sites for c-myc I and c-myc II are at different distances from the translational start site. The 'oocyte-specific' and 'somatic-type' developmental regulation of c-myc is reminiscent of polymerase III 5S RNA gene expression in Xenopus, and may provide new insights into the developmental regulation of genes transcribed by RNA polymerase II.

PubMed ID: 2686981
PMC ID: PMC401586
Article link: EMBO J


Species referenced: Xenopus
Genes referenced: myc

References [+] :
Alitalo, Identification of nuclear proteins encoded by viral and cellular myc oncogenes. , Pubmed