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The endoplasmic reticulum localised protein seipin, encoded by the gene  Berardinelli–Seip congenital lipodystrophy type 2 (BSCL2),  serves a critical but poorly defined function in the physiology of both adipose and neural tissue. In humans,  BSCL2  loss-of-function mutations cause a severe form of lipodystrophy, whilst a distinct set of gain-of-toxic-function mutations are associated with a heterogeneous group of neuropathies. However, despite the importance of seipin dysfunction to the pathophysiology of these conditions, little is known about its physiological role in adipocytes or neurons.  BSCL2  mRNA has previously been identified in human and mouse brain, yet no definitive assessment of its expression has been undertaken. Here we comprehensively characterised the neuroanatomical distribution of mouse  Bscl2  using complementary in situ hybridisation histochemistry and immunohistochemistry techniques. Whilst  Bscl2  was broadly expressed throughout the rostral-caudal extent of the mouse brain, it exhibited a discrete neuroanatomical profile.  Bscl2  was most abundantly expressed in the hypothalamus and in particular regions associated with the regulation of energy balance including, the paraventricular, ventromedial, arcuate and dorsomedial nuclei.  Bscl2  expression was also identified within the brainstem dorsal vagal complex, which together with the paraventricular nucleus of the hypothalamus represented the site of highest expression. Further neurochemical profiling of these two nuclei revealed  Bscl2 /seipin expression within energy balance related neuronal populations. Specifically, seipin was detected in oxytocin neurons of the paraventricular nucleus of the hypothalamus and in catecholamine neurons of the dorsal vagal complex. These data raise the possibility that in addition to its role in adipose tissue development, seipin may also be involved in the central regulation of energy balance.

Neuroanatomical Characterisation of the Expression of the Lipodystrophy and Motor-Neuropathy Gene Bscl2 in Adult Mouse Brain