MSH6(MutS homolog 6)是DNA错配修复(MMR)系统中的一个关键基因,属于MutS基因家族。该家族成员在维持基因组稳定性中起重要作用,通过识别和修复DNA复制过程中产生的碱基错配或小片段插入/缺失错误。MSH6与MSH2蛋白形成异源二聚体MutSα复合物,主要负责识别单碱基错配和短插入缺失环。MSH6基因突变会导致错配修复功能缺陷,造成微卫星不稳定性(MSI),这是林奇综合征(遗传性非息肉病性结直肠癌)的主要致病机制之一。携带MSH6突变的患者患结直肠癌、子宫内膜癌等恶性肿瘤的风险显著增加。MSH6表达降低会导致细胞无法有效修复DNA复制错误,积累突变并可能引发癌症;而MSH6过表达在某些情况下可能增强基因组稳定性,但也可能干扰正常细胞周期。MSH6突变表型通常比其他MMR基因(如MLH1或MSH2)突变温和,发病年龄较晚。该基因位于人类染色体2p16.3,包含10个外显子。除癌症外,MSH6变异还与儿童期血液系统恶性肿瘤和某些神经发育障碍相关。MutS基因家族的共同特点是都含有保守的ATP酶结构域和错配结合域,能够识别特定类型的DNA错配。临床上常通过免疫组化检测MSH6蛋白表达或基因测序来诊断林奇综合征。
This gene encodes a member of the DNA mismatch repair MutS family. In E. coli, the MutS protein helps in the recognition of mismatched nucleotides prior to their repair. A highly conserved region of approximately 150 aa, called the Walker-A adenine nucleotide binding motif, exists in MutS homologs. The encoded protein heterodimerizes with MSH2 to form a mismatch recognition complex that functions as a bidirectional molecular switch that exchanges ADP and ATP as DNA mismatches are bound and dissociated. Mutations in this gene may be associated with hereditary nonpolyposis colon cancer, colorectal cancer, and endometrial cancer. Transcripts variants encoding different isoforms have been described. [provided by RefSeq, Jul 2013]
Subcellular localization of MSH6 (and its protein):
Gene Ontology (GO) terms for MSH6:
| Interacting Gene | Interaction | Source/Score |
| Name |
|---|
| 3430 Mismatch repair [PATH:hsa03430] |
| 5200 Pathways in cancer [PATH:hsa05200] |
| 5210 Colorectal cancer [PATH:hsa05210] |
| Name |
|---|
| DNA Repair |
| Mismatch Repair |
| Mismatch repair (MMR) directed by MSH2:MSH6 (MutSalpha) |
| Disease | Score | NofPmids | NofSnps | Source |
| Turcot syndrome (disorder) | 0.363800186 | 14 | 2 | BeFree_CLINVAR_CTD_human_ORPHANET |
| Hereditary Nonpolyposis Colorectal Cancer | 0.277111592 | 129 | 177 | BeFree_CLINVAR_GAD_ORPHANET |
| COLORECTAL CANCER, HEREDITARY NONPOLYPOSIS, TYPE 5 | 0.24 | 3 | 11 | CLINVAR_UNIPROT |
| Hereditary Nonpolyposis Colorectal Neoplasms | 0.152200689 | 18 | 0 | CTD_human_GAD_LHGDN |
| Endometrial Carcinoma | 0.143040222 | 52 | 4 | BeFree_CLINVAR_GAD |
| Endometrial Neoplasms | 0.134916828 | 7 | 0 | CTD_human_GAD_LHGDN |
| Microsatellite Instability | 0.124734064 | 3 | 0 | CTD_human_GAD |
| Torre-Muir syndrome | 0.121628651 | 6 | 0 | BeFree_ORPHANET |
| Neoplastic Syndromes, Hereditary | 0.120542884 | 2 | 86 | BeFree_CLINVAR |
| Colorectal cancer, hereditary nonpolyposis, type 1 | 0.120271442 | 1 | 4 | BeFree_CLINVAR |
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