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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Inositol diphosphate signaling regulates telomere length.

Activation of phospholipase C-dependent inositol polyphosphate signaling pathways generates distinct messengers derived from inositol 1,4,5-trisphosphate that control gene expression and mRNA export. Here we report the regulation of telomere length by production of a diphosphorylinositol tetrakisphosphate, PP-IP4, synthesized by the KCS1 gene product. Loss of PP-IP4 production results in lengthening of telomeres, whereas overproduction leads to their shortening. This effect requires the presence of Tel1, the yeast homologue of ATM, the protein mutated in the human disease ataxia telangiectasia. Our data provide in vivo evidence of a regulatory link between inositol polyphosphate signaling and the checkpoint kinase family and describe a third nuclear process modulated by phospholipase C activation.[1]


  1. Inositol diphosphate signaling regulates telomere length. York, S.J., Armbruster, B.N., Greenwell, P., Petes, T.D., York, J.D. J. Biol. Chem. (2005) [Pubmed]
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