SHORT syndrome with partial lipodystrophy due to impaired phosphatidylinositol 3 kinase signaling.
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Chudasama KK, Winnay J, Johansson S, Claudi T, Konig R, Haldorsen I, Johansson B, Woo JR, Aarskog D, Sagen JV, Kahn CR, Molven A, Njolstad PR
SHORT syndrome with partial lipodystrophy due to impaired phosphatidylinositol 3 kinase signaling.
Am J Hum Genet. 2013 Jul 11;93(1):150-7. doi: 10.1016/j.ajhg.2013.05.023. Epub 2013 Jun 27.
- PubMed ID
- 23810379 [ View in PubMed]
- Abstract
The phosphatidylinositol 3 kinase (PI3K) pathway regulates fundamental cellular processes such as metabolism, proliferation, and survival. A central component in this pathway is the p85alpha regulatory subunit, encoded by PIK3R1. Using whole-exome sequencing, we identified a heterozygous PIK3R1 mutation (c.1945C>T [p.Arg649Trp]) in two unrelated families affected by partial lipodystrophy, low body mass index, short stature, progeroid face, and Rieger anomaly (SHORT syndrome). This mutation led to impaired interaction between p85alpha and IRS-1 and reduced AKT-mediated insulin signaling in fibroblasts from affected subjects and in reconstituted Pik3r1-knockout preadipocytes. Normal PI3K activity is critical for adipose differentiation and insulin signaling; the mutated PIK3R1 therefore provides a unique link among lipodystrophy, growth, and insulin signaling.