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Mounting evidence suggests that TGFβ/BMP signaling pathway is most likely involved in shell biomineralization in molluscs, but the function of pathway receptors is poorly studied. Here, we cloned and identified two homologous BMP receptor genes,  PfBMPR1B  and  PfBAMBI , from the pearl oyster  Pinctada fucata . Real-time quantitative PCR and  in situ  hybridization revealed that these genes were expressed in mantle edge and pallial, specifically located at the outer epithelia. Knockdown of  PfBMPR1B  by RNA interference (RNAi) significantly decreased the expression levels of matrix protein (MP) genes and induced the abnormal ultrastructure of prismatic and nacreous layers. Conversely, knockdown of  PfBAMBI  significantly increased the expression levels of a portion of MP genes and induced the overgrowth of nacreous layer crystals. In the RNAi and shell notching experiments, MP gene expressions were competitively regulated by  PfBMPR1B  and  PfBAMBI . In addition, the receptor inhibitor LDN193189 reduced the expression levels of MP genes in mantle primary cells and larvae, and induced abnormal D-shaped shell formation during larval development. Collectively, these results clearly show that  PfBMPR1B  and  PfBAMBI  are involved in regulating shell biomineralization in  P .  fucata . Our study therefore provides the direct evidence that BMP receptors participate in mollusc biomineralization.

The receptor genes PfBMPR1B and PfBAMBI are involved in regulating shell biomineralization in the pearl oyster Pinctada fucata