TCN2(Transcobalamin 2,转钴胺素2)是一种编码维生素B12(钴胺素)转运蛋白的基因,属于维生素B12结合蛋白家族。其主要功能是将维生素B12从肠道吸收后运输至全身各组织,尤其是快速分裂的细胞(如骨髓中的造血细胞)。TCN2的表达产物是一种血浆蛋白,与维生素B12结合形成复合物(holo-TC),通过受体介导的内吞作用被细胞摄取。该基因的作用位点包括肝脏、肠道和血液系统。TCN2突变可能导致维生素B12转运障碍,引发巨幼细胞性贫血(megaloblastic anemia)、神经系统损伤(如脊髓亚急性联合变性)或发育迟缓,因为维生素B12是DNA合成和髓鞘形成的关键辅因子。与TCN2相关的疾病包括遗传性转钴胺素缺乏症(OMIM 275350)和某些同型半胱氨酸血症病例。若TCN2过表达,可能增加维生素B12的利用率,但过量可能干扰其他微量营养素的平衡;若表达降低则会导致功能性维生素B12缺乏,即使血液中B12水平正常。TCN2属于维生素B12结合蛋白家族,该家族成员(如TCN1、TCN2)均能结合B12,但TCN2是唯一具有细胞递送功能的蛋白。家族共性包括含有特定的B12结合结构域和参与B12代谢调控。研究还发现TCN2多态性(如776C>G)可能影响B12代谢效率,与心血管疾病和神经退行性疾病风险相关。
This gene encodes a member of the vitamin B12-binding protein family. This family of proteins, alternatively referred to as R binders, is expressed in various tissues and secretions. This plasma protein binds cobalamin and mediates the transport of cobalamin into cells. This protein and other mammalian cobalamin-binding proteins, such as transcobalamin I and gastric intrisic factor, may have evolved by duplication of a common ancestral gene. Alternative splicing results in multiple transcript variants.[provided by RefSeq, May 2010]
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TCN2基因(以及对应的蛋白质)的细胞分布位置:
TCN2基因的本体(GO)信息:
名称 |
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4977 Vitamin digestion and absorption [PATH:hsa04977] |
名称 |
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Cobalamin (Cbl, vitamin B12) transport and metabolism |
Defective CD320 causes methylmalonic aciduria |
Defective TCN2 causes hereditary megaloblastic anemia |
Defects in cobalamin (B12) metabolism |
Defects in vitamin and cofactor metabolism |
Disease |
Diseases of metabolism |
Metabolism of vitamins and cofactors |
Metabolism of water-soluble vitamins and cofactors |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Transcobalamin II deficiency | 0.360271442 | 1 | 1 | BeFree_CLINVAR_CTD_human_ORPHANET |
Cleft Lip | 0.127458414 | 3 | 0 | CTD_human_GAD_LHGDN |
Anemia, Megaloblastic | 0.123538676 | 4 | 0 | BeFree_CTD_human_LHGDN |
Prostatic Neoplasms | 0.12 | 1 | 0 | CTD_human |
Autistic Disorder | 0.12 | 1 | 0 | CTD_human |
Adverse reaction to drug | 0.12 | 1 | 0 | CTD_human |
Adenoma | 0.12 | 1 | 0 | CTD_human |
Leukoencephalopathies | 0.12 | 1 | 0 | CTD_human |
Nephroblastoma | 0.12 | 1 | 1 | GWASCAT |
Colorectal Neoplasms | 0.12 | 1 | 0 | CTD_human |
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