Perinatal, Metabolic and Reproductive Features in PPARG-related Lipodystrophy.

OBJECTIVE: The adipogenic PPARG-encoded PPARγ nuclear receptor also display essential placental functions. We evaluated metabolic, reproductive and perinatal features of patients with PPARG-related lipodystrophy.

METHODS: Current and retrospective data were collected in patients referred to a National Rare Diseases Reference Centre.

RESULTS: 26 patients from 15 unrelated families were studied (18 women, median age 43 years). They carried monoallelic PPARG variants except a homozygous patient with congenital generalized lipodystrophy. Among heterozygous patients aged 16 or more (n = 24), 92% had diabetes, 96% partial lipodystrophy (median age at diagnosis 24 and 37 years, respectively), 78% hypertriglyceridemia, 71% liver steatosis and 58% hypertension. Mean BMI was 26 ± 5.0 kg/m2. Women (n = 16) were frequently affected by acute pancreatitis (n = 6) and/or polycystic ovary syndrome (n = 12). Eleven women obtained one or several pregnancies, all complicated by diabetes (n = 8), hypertension (n = 4) and/or hypertriglyceridemia (n = 10). We analysed perinatal data of patients according to the presence (n = 8) or absence (n = 9) of maternal dysmetabolic environment. The median gestational age at birth was low in both groups (37 and 36 weeks of amenorrhea, respectively). As expected, birth weight was higher in patients exposed to a fetal dysmetabolic environment of maternal origin. In contrast, 85.7% of non-exposed patients, in whom the variant is, or is very likely to be, paternally-inherited, were small for gestational age.

CONCLUSIONS: Lipodystrophy-related PPARG variants induce early metabolic complications. Our results suggest that placental expression of PPARG pathogenic variants carried by affected fetuses could impair prenatal growth and parturition. This justifies careful pregnancy monitoring in affected families.