The cloning and characterization of a localized maternal transcript in Xenopus laevis whose zygotic counterpart is detected in the CNS

Bramham A. Reddy, Malgorzata Kloc, Laurence D. Etkin

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

We have cloned a cDNA (xlan4) from a Xenopus laevis oocyte cDNA library whose cognate mRNA is localized in the animal pole region of full grown oocytes. The cDNA can be translated in vitro to produce a predicted size protein of 35 kDa and, is also expressed in E. coli as a fusion protein. The conceptual protein encoded by the xlan4 cDNA is 17.5% proline rich and possesses several PEST sequences found in proteins with short half-lives. The xlan4 mRNA is 2.6 kb and during early development its titer decreases until the neurula stage after which it begins to reaccumulate. Northern blots on dissected embryos and in situ hybridization revealed that the zygotic expression is limited to the dorsal axial structural consisting primarily of the CNS. UV irradiation of the vegetal pole region immediately following fertilization that produces ventralized embryos results in a loss of zygotic xlan4 expression. In the adult, xlan4 mRNA is limited primarily to the brain. The presence of this mRNA in animal pole region which contributes to the future neural cell lineages suggests that this gene product may function either in the specification of neural cell types or in a neural specific function.

Original languageEnglish (US)
Pages (from-to)143-150
Number of pages8
JournalMechanisms of Development
Volume39
Issue number3
DOIs
StatePublished - Dec 1992

Keywords

  • Central nervous system
  • Development
  • Embryogenesis
  • Localized mRNA
  • Oocyte
  • Xenopus laevis

ASJC Scopus subject areas

  • Developmental Neuroscience
  • Developmental Biology

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