Isolation and growth factor inducibility of the Xenopus laevis Lmx1b gene
UNSPECIFIED. (2003) Isolation and growth factor inducibility of the Xenopus laevis Lmx1b gene. INTERNATIONAL JOURNAL OF DEVELOPMENTAL BIOLOGY, 47 (4). pp. 253-262. ISSN 0214-6282Full text not available from this repository.
This paper reports the cloning of the full length Xenopus laevis Lmx1b gene, Xlmx1b. Xlmx1b is a LIM homeodomain protein with high conservation to homologues identified in human, mouse, hamster and chick. In situ hybridisation and RT-PCR analysis showed that Xlmx1b has a specific temporal expression pattern which can be separated into three main spatial domains. An Xlmx1b probe hybridized to regions of the nervous system from stage 13 onwards; these regions included the placodes and otic vesicles, the eye and specific sets of neurons. Sectioning of in situ hybridised embryos confirmed the location of transcripts as discreet regions of staining in ventrolateral regions of the neural tube. From stage 27, transcripts could be detected in the capsule of pronephric glomus. Finally, transcripts were detected by Northern blot analysis in the developing fore and hind limbs. Xlmx1b transcripts were also detected by Northern blot analysis in eye, brain, muscle and mesonephros tissue in metamorphosing tadpoles. RT-PCR analysis showed that zygotic expression of Xlmx1b is initiated at stage 10.5- and the temporal sequence of Xlmx1b expression is identical in both neural and presumptive pronephros regions. The effects of the growth factors activin A, retinoic acid (RA) and basic fibroblast growth factor (bFGF) on the regulation of Xlmx1b were also studied. Xlmx1b was found to be upregulated by activin A and RA inhibited this upregulation in a concentration dependant manner. In contrast, bFGF had no effect on the regulation of Xlmx1b.
|Item Type:||Journal Article|
|Subjects:||Q Science > QH Natural history > QH301 Biology|
|Journal or Publication Title:||INTERNATIONAL JOURNAL OF DEVELOPMENTAL BIOLOGY|
|Publisher:||U B C PRESS|
|Official Date:||May 2003|
|Number of Pages:||10|
|Page Range:||pp. 253-262|
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