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Congenital generalized lipodystrophy type 1
Berardinelli-Seip congenital lipodystrophy (BSCL) is usually diagnosed at birth or soon thereafter. Because of the absence of functional adipocytes, lipid is stored in other tissues, including muscle and liver. Affected individuals develop insulin resistance and approximately 25%-35% develop diabetes mellitus between ages 15 and 20 years. Hepatomegaly secondary to hepatic steatosis and skeletal muscle hypertrophy occur in all affected individuals. Hypertrophic cardiomyopathy is reported in 20%-25% of affected individuals and is a significant cause of morbidity from cardiac failure and early mortality. [from GeneReviews]
Obesity due to congenital leptin deficiency
Leptin deficiency or dysfunction (LEPD) is characterized by severe early-onset obesity, hyperphagia, hypogonadotropic hypogonadism, and neuroendocrine/metabolic dysfunction (Ozata et al., 1999). [from OMIM]
Congenital generalized lipodystrophy type 2
CIDEC-related familial partial lipodystrophy
A rare genetic lipodystrophy with characteristics of abnormal subcutaneous fat distribution, resulting in preservation of visceral, neck and axillary fat and absence of lower limb and gluteofemoral subcutaneous fat. Additional clinical features are acanthosis nigricans, insulin-resistant type II diabetes mellitus, dyslipidaemia, and hypertension, leading to pancreatitis, hepatomegaly and hepatic steatosis. [from SNOMEDCT_US]
Keppen-Lubinsky syndrome
Keppen-Lubinsky syndrome (KPLBS) is a rare disorder characterized by severely delayed psychomotor development, hypertonia, hyperreflexia, generalized lipodystrophy giving an aged appearance, and distinctive dysmorphic features, including microcephaly, prominent eyes, narrow nasal bridge, and open mouth (summary by Masotti et al., 2015). [from OMIM]
Nestor-Guillermo progeria syndrome
Nestor-Guillermo progeria syndrome (NGPS) is an autosomal recessive disorder characterized by lipoatrophy, osteoporosis, and very severe osteolysis. Patients have no cardiovascular impairment, diabetes mellitus, or hypertriglyceridemia, but suffer profound skeletal abnormalities that affect their quality of life. Onset is after 2 years of age, and lifespan is relatively long (summary by Cabanillas et al., 2011). [from OMIM]
Decreased serum leptin
A decreased concentration of leptin in the blood. [from HPO]
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