Seipin is an endoplasmic reticulum (ER) membrane protein implicated in lipid droplet (LD) biogenesis and mutated in severe congenital lipodystrophy (BSCL2). Here, we show that seipin is stably associated with nascent ER-LD contacts in human cells, typically via one mobile focal point per LD Seipin appears critical for such contacts since ER-LD contacts were completely missing or morphologically...

Berardinelli-Seip congenital lipodystrophy (BSCL) is a rare autosomal recessive condition associating insulin resistance, absence of subcutaneous fat and muscular hypertrophy. Disease-causing mutations have been described in AGPAT2 and BSCL2 genes. Hypertrophic cardiomyopathy is a classical late (third decade) complication which has only been occasionally described in childhood. We report on a ...

Berardinelli–Seip Congenital Lipodystrophy( BSCL) also called Congenital Generalised Lipodystrophy (CGL) is a very rare autosomal recessive metabolic syndrome with a prevalence of less than1 case in 12 million. About 200 cases have been reported so far world-wide. BSCL2 ,the more severe form of the disease with onset in the neonatal period or early infancy is present in Lebanon, Portugal, Norwa...

background: progressive encephalopathy with or without lipodystrophy is a rare autosomal recessive childhood-onset seipin-associated neurodegenerative syndrome, leading to developmental regression of motor and cognitive skills. in this study, we introduce a patient with developmental regression and autism. the causative mutation was found by exome sequencing. methods: the proband showed a gener...

Molecular genetic studies have pointed to a relationship between congenital lipodystrophy syndromes and some cardiac disorders. For instance, mutations in LMNA cause either lipodystrophy or cardiomyopathy, indicating that different mutations in the same gene can produce these clinical syndromes. The present authors describe a 10-year-old female with Berardinelli-Seip congenital complete lipodys...

Lipid droplets (LDs) are storage organelles consisting of a neutral lipid core surrounded by a phospholipid monolayer and a set of LD-specific proteins. Most LD components are synthesized in the endoplasmic reticulum (ER), an organelle that is often physically connected with LDs. How LD identity is established while maintaining biochemical and physical connections with the ER is not known. Here...

BACKGROUND While pathogenic mutations in BSCL2/Seipin cause congenital generalized lipodystrophy, the underlying mechanism is largely unknown. In this study, we investigated whether and how the pathogenic missense A212P mutation of Seipin (Seipin-A212P) inhibits adipogenesis. METHODOLOGY/RESULTS We analyzed gene expression and lipid accumulation in stable 3T3-L1 cell lines expressing wild typ...

Functional heterogeneity within the lipid droplet (LD) pool of a single cell has been observed, yet the underlying mechanisms remain enigmatic. Here, we report on identification of a specialized LD subpopulation characterized by a unique proteome and a defined geographical location at the nucleus-vacuole junction contact site. In search for factors determining identity of these LDs, we screened...