TMEM121B（跨膜蛋白121B）属于TMEM基因家族，该家族编码跨膜蛋白，通常参与细胞膜结构维持、信号转导或物质运输等生物学过程。TMEM121B的具体功能尚未完全明确，但研究表明它可能在细胞内膜系统（如内质网或高尔基体）的膜动态平衡中发挥作用，参与蛋白质运输或细胞器形态维持。其表达产物是一种跨膜蛋白，可能通过与其他蛋白质相互作用来调节细胞内的膜运输过程。TMEM121B的突变可能影响其跨膜结构域或功能位点，导致细胞内膜系统紊乱，进而干扰分泌途径或细胞器功能，但目前与特定疾病的直接关联尚未明确。若TMEM121B过表达，可能扰乱内膜系统的稳态，引发内质网应激或异常囊泡运输；而表达降低则可能影响依赖其功能的细胞过程，如蛋白质分选或脂质代谢。TMEM基因家族的共性包括编码跨膜结构域保守的蛋白质，多数成员定位于细胞膜或细胞器膜，参与膜相关功能（如运输、离子通道或受体活性）。研究TMEM121B有助于进一步理解内膜系统调控机制及其在细胞生理或病理中的作用。

TMEM121B, a member of the transmembrane protein 121 family, encodes a conserved integral membrane protein primarily localized to the endomembrane system, including the endoplasmic reticulum and Golgi apparatus. While its precise molecular function remains under investigation, current evidence suggests that TMEM121B plays a critical role in maintaining the structural integrity and dynamic homeostasis of intracellular membranes, potentially by facilitating vesicular trafficking, protein sorting, or the modulation of organelle morphology through protein-protein interactions. As a typical member of the TMEM superfamily, which is characterized by conserved transmembrane domains and involvement in membrane-associated processes such as transport and signaling, TMEM121B likely contributes to the regulation of lipid metabolism and the secretory pathway. Disruptions in TMEM121B expression or function, whether through loss-of-function mutations that compromise membrane stability or gain-of-function events that perturb endomembrane equilibrium, may lead to endoplasmic reticulum stress, aberrant vesicle transport, and broader cellular dysfunction, highlighting its importance in understanding the mechanistic underpinnings of endomembrane regulation and its potential implications in cellular physiology and pathology.

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