Abstract:
:Over a period of many months, Xenopus oocytes stockpile large quantities of tRNA for use during the first few hours of embryogenesis. To test the idea that these tRNAs are transcribed from one set of genes and that another set is used by somatic cells, we used synthetic oligonucleotides to analyze the sequence and steady-state levels of unspliced tyrosine tRNA precursors in Xenopus laevis oocytes, embryos, and cultured kidney cells. These analyses identify four kinds of tyrosine tRNA genes, two oocyte-type and two somatic-type, whose unspliced transcripts are distinguishable from one another by their different 5' leader and intervening sequences. The oocyte-type tyrosine tRNA precursors are present in oocytes, very abundant in gastrula embryos, but absent from postembryonic somatic cells. The somatic-type precursors are undetectable in oocytes but are found in gastrula and later stage embryos and in somatic cells. The major switch from oocyte-type to somatic-type transcripts occurs early during embryogenesis, between the midblastula transition and the onset of neurulation, but some oocyte-type precursors are also detectable in tadpoles.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Stutz F,Gouilloud E,Clarkson SGdoi
10.1101/gad.3.8.1190subject
Has Abstractpub_date
1989-08-01 00:00:00pages
1190-8issue
8eissn
0890-9369issn
1549-5477journal_volume
3pub_type
杂志文章abstract::A prominent feature of cell differentiation is the initiation and maintenance of an irreversible cell cycle arrest with the complex involvement of the retinoblastoma (RB) family (RB, p130, p107). We have isolated the HBP1 transcriptional repressor as a potential target of the RB family in differentiated cells. By homo...
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