RGD Reference Report - Adult pancreatic islets require differential pax6 gene dosage. - Rat Genome Database

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Adult pancreatic islets require differential pax6 gene dosage.

Authors: Hamasaki, Akihiro  Yamada, Yuichiro  Kurose, Takeshi  Ban, Nobuhiro  Nagashima, Kazuaki  Takahashi, Akira  Fujimoto, Shimpei  Shimono, Dai  Fujiwara, Michio  Toyokuni, Shinya  Seino, Yutaka  Inagaki, Nobuya 
Citation: Hamasaki A, etal., Biochem Biophys Res Commun. 2007 Feb 2;353(1):40-6. Epub 2006 Dec 4.
RGD ID: 12790972
Pubmed: PMID:17178107   (View Abstract at PubMed)
DOI: DOI:10.1016/j.bbrc.2006.11.105   (Journal Full-text)

Pax6, a paired homeodomain transcription factor, plays crucial roles in morphogenesis of eye, central nervous system, and pancreatic islets. Recently, heterozygosity for pax6 mutation has been reported in some individuals with glucose intolerance and aniridia. To investigate the role of pax6 for pancreatic islet function, we examined the pancreatic phenotype of small eye rat strain (rSey(2)) with a point mutation in the pax6 locus resulting in truncated PAX6 proteins. Analyses of the insulin secretory profile of heterozygous rSey(2)/+ revealed that insulin secretion is significantly increased in response to membrane-depolarizing stimuli such as arginine, tolbutamide, and KCl. The processes of insulin granule exocytosis were suggested to be enhanced in rSey(2)/+. On the other hand, pancreatic insulin and glucagon content and islet architecture in rSey(2)/+ showed no significant differences compared to wild-type. These findings indicate differential requirements for pax6 gene dosage in displaying function and maintaining architecture of adult pancreatic islets.

Phenotype Annotations    

Mammalian Phenotype
Objects Annotated

Genes (Rattus norvegicus)
Pax6  (paired box 6)

Additional Information