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The novel loss of function Ile354Val mutation in PPARG causes familial partial lipodystrophy.

Abstract：

AIMS:Familial partial lipodystrophy (FPLD) is a rare autosomal dominant disorder, mostly due to mutations in lamin A (LMNA) or in peroxisome proliferator-activated receptor gamma (PPARG) genes. In the present study, we aimed to identify and functionally characterize the genetic defect underlying FPLD in an Italian family presenting with several affected individuals in three consecutive generations. METHODS:Mutational screening by direct Sanger sequencing has been carried out on both LMNA and PPARG genes. In silico analyses and functional in vitro studies on transfected cell lines have been also performed to evaluate the biological impact of the identified mutation. RESULTS:We identified a novel PPARG missense mutation (i.e., PPARγ2 Ile354Val) segregating with FPLD in the study family. In silico analyses and in vitro experiments showed that probably altering the PPARγ2 ligand binding domain conformation, the Ile354Val aminoacid change leads to a significant reduction (i.e., ~ 30-35%) of transcriptional activity in the mutant receptor, with no evidences of a dominant negative effect on the wild-type receptor. CONCLUSIONS:Our present data extend the spectrum of PPARG mutations responsible for FPLD3 and reinforce the notion that even loss of function mutations affecting transcriptional activity to an extent lower than that observed in the case of haploinsufficiency are able to cause a severe FPLD3 phenotype.

journal_name

Acta Diabetol

journal_title

Acta diabetologica

authors

Padova G,Prudente S,Vinciguerra F,Sudano D,Baratta R,Bellacchio E,Trischitta V,Vallone A,Sciacca L,Frittitta L

doi

10.1007/s00592-019-01462-y

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

589-596

issue

5

eissn

0940-5429

issn

1432-5233

pii

10.1007/s00592-019-01462-y

journal_volume

57

pub_type

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