Cloning and expression throughout mouse development of mfat1, a homologue of the Drosophila tumour suppressor gene fat

✍ Scribed by Barnaby Cox; Anna-Katerina Hadjantonakis; Jane E. Collins; Anthony I. Magee

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 776 KB
• Volume: 217
• Category: Article
• ISSN: 1058-8388
• DOI: 10.1002/(sici)1097-0177(200003)217:3<233::aid-dvdy1>3.0.co;2-o

✦ Synopsis

We present the entire sequence of the mouse Fat orthologue (mFat1), a protein of 4,588 amino acids with 34 cadherin repeats, 27 potential N-glycosylation sites, five EGF repeats and a laminin A G-motif in its extracellular domain. A single transmembrane region is followed by a cytoplasmic domain containing putative catenin-binding sequences. mFat1 shows high homology to human FAT and lesser homology to Drosophila Fat. The sequence of this giant cadherin suggests that it is unlikely to have a homophilic adhesive function, but may mediate heterophilic adhesion or play a signalling role. Expression analysis shows that the mfat1 gene is expressed early in pre-implantation mouse development, at the compact eight cell stage. Whole-mount and section in situ analyses show that transcripts are widely expressed throughout post-implantation development, most notably in the limb buds, branchial arches, forming somites, and in particular in the proliferating ventricular zones in the brain, being down-regulated as cells cease dividing. RT-PCR detects widespread expression in the adult suggesting a role in proliferation and differentiation of many tissues and cell types.