Bmpr1b-flox Mouse

Bmpr1b, short for Bone morphogenetic protein receptor type 1B, is a multifunctional signaling molecule in the canonical bone morphogenetic protein (BMP)/Sma-and mad-related protein (Smad) signaling pathway. It is well-known as the first major gene associated with sheep prolificacy [5]. Bmpr1b also plays a role in ovarian function and folliculogenesis in mammals, and its disruption is related to primary ovarian insufficiency (POI) [2,3].

In sheep, the FecB mutation in Bmpr1b, located near the binding site of the small molecule repressor protein FKBP1A, may increase the ovulation rate by affecting the intensity of the interactions between Bmpr1b and FKBP1A, thus changing the activity in the BMP/SMAD pathway [1]. In human studies, missense mutations in Bmpr1b lead to an impairment of downstream BMP signaling, unveiling a link between Bmpr1b variants and the origin of POI [3]. Also, Bmpr1b mutations are likely a cause of Pierre Robin sequence [4]. Additionally, Bmpr1b polymorphisms are associated with breast cancer susceptibility in Chinese Han women [6], and the lncRNA SNHG6/miR-125b-5p/Bmpr1b axis may be a new therapeutic target for triple-negative breast cancer [7]. In sheep granulosa cells, miR-1306 can inhibit Bmpr1b and promote cell apoptosis, potentially improving sheep fecundity [8]. In endometriosis patients, the lncRNA BMPR1B-AS1, regulated by IGF2BP2, affects decidualization through the SMAD1/5/9 pathway [9]. Genetically defined Bmpr1b-labeled DRG neurons are involved in mediating behavioral responses to high colon distension and over-reactivity in a model of inflammatory bowel disease [10].

In conclusion, Bmpr1b is crucial in multiple biological processes such as ovarian function, folliculogenesis, and sheep prolificacy. Its mutations and polymorphisms are associated with various diseases including POI, Pierre Robin sequence, and breast cancer. The study of Bmpr1b through different models helps in understanding the underlying molecular mechanisms of these biological processes and diseases, providing potential targets for diagnosis, treatment, and genetic improvement.