Single-minded homolog 1 (SIM1)

Single-minded homolog 1 (SIM1) is a transcription factor of the basic helix-loop-helix-PAS (bHLH-PAS) family, which plays a critical role in embryonic and neural development, especially in the formation and function of the paraventricular nucleus of the hypothalamus[1][2][3][4]. SIM1 functions as a heterodimer with ARNT or ARNT2 to regulate gene expression essential for neurogenesis, energy homeostasis, and feeding behavior[1][2][3][4]. Disruption of SIM1, whether through haploinsufficiency or missense variants, is associated with severe early-onset obesity and syndromes resembling Prader-Willi, primarily due to hyperphagia and dysregulation of hypothalamic circuits controlling energy balance[2][3][4]. It does not currently serve as a direct drug target, but its genetic status is important in the differential diagnosis of syndromic or monogenic obesity.

Other names

SIM bHLH transcription factor 1bHLHe14class E basic helix-loop-helix protein 14single-minded family bHLH transcription factor 1single-minded homolog 1, class E basic helix-loop-helix protein 14

not applicable (no drugs currently target SIM1 directly)