UGT1A8(尿苷二磷酸葡萄糖醛酸转移酶1A8)属于UGT1A基因家族,该家族位于人类2号染色体上,由多个外显子通过选择性剪接形成不同的亚型(如UGT1A1、UGT1A9等)。UGT1A家族共性是通过葡萄糖醛酸化(一种代谢反应,将葡萄糖醛酸基团转移到小分子上)参与内源性物质(如胆红素、类固醇)和外源性物质(如药物、毒素)的解毒和排泄。UGT1A8主要在肠道中表达,其编码的酶催化底物与葡萄糖醛酸结合,增加水溶性以促进排出。该基因的典型底物包括药物(如伊立替康)、植物化合物(如黄酮类)和环境毒素。UGT1A8的功能特点是组织特异性强且底物范围较窄,偏好酚类和某些抗肿瘤药物代谢。若该基因发生突变(如启动子区TA重复序列多态性),可能导致酶活性降低,影响药物代谢效率(如伊立替康毒性增加)或内源性物质积累(如轻度高胆红素血症)。UGT1A8与疾病关联包括:化疗毒性风险(如UGT1A8*2等位基因与伊立替康腹泻相关)、炎症性肠病(肠道代谢异常可能加重病变)和癌症易感性(代谢能力差异影响致癌物清除)。过表达UGT1A8可能加速药物清除(降低药效)或干扰其他UGT亚型功能(如竞争共同底物);而低表达则可能导致药物蓄积中毒或解毒功能受损。该基因与UGT1A家族其他成员共享N端序列,但C端决定底物特异性,这种结构特点使家族成员既能协同工作又各司其职。专业术语解释:葡萄糖醛酸化(glucuronidation)是肝脏和肠道中常见的Ⅱ相代谢反应;选择性剪接(alternative splicing)指同一基因通过不同mRNA剪接方式产生多种蛋白质亚型。
This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. The enzyme encoded by this gene has glucuronidase activity with many substrates including coumarins, phenols, anthraquinones, flavones, and some opioids. [provided by RefSeq, Jul 2008]
该基因编码一个UDP葡萄糖醛酸,即转化小的亲脂性分子,如类固醇,胆红素,激素和药物,成水溶性,可排泄的代谢物的葡萄糖醛酸化途径的酶。该基因是一个复杂的轨迹编码几个UDP-glucuronosyltransferases的一部分。轨迹包括13独特的交替的第一外显子后面四种常见的外显子。替代第一外显子的四个被认为是假。每个其余九5‘外显子的可拼接到四种常见的外显子,造成九的蛋白质具有不同的N端和相同的C-末端。每个第一外显子编码底物结合位点,并通过它自己的启动子调节。由该基因编码的酶具有许多基材,包括香豆素,酚,蒽醌,黄酮,和一些类阿片葡萄糖醛酸酶的活性。 [由RefSeq的,2008年7月提供]
UGT1A8基因(以及对应的蛋白质)的细胞分布位置:
UGT1A8基因的本体(GO)信息:
名称 |
---|
40 Pentose and glucuronate interconversions [PATH:hsa00040] |
53 Ascorbate and aldarate metabolism [PATH:hsa00053] |
500 Starch and sucrose metabolism [PATH:hsa00500] |
140 Steroid hormone biosynthesis [PATH:hsa00140] |
830 Retinol metabolism [PATH:hsa00830] |
860 Porphyrin and chlorophyll metabolism [PATH:hsa00860] |
980 Metabolism of xenobiotics by cytochrome P450 [PATH:hsa00980] |
982 Drug metabolism - cytochrome P450 [PATH:hsa00982] |
983 Drug metabolism - other enzymes [PATH:hsa00983] |
5204 Chemical carcinogenesis [PATH:hsa05204] |
名称 |
---|
Biological oxidations |
Glucuronidation |
Phase II conjugation |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Malignant neoplasm of urinary bladder | 0.122367032 | 3 | 1 | GAD_GWASCAT |
Diarrhea | 0.00764398 | 3 | 0 | BeFree_GAD |
Colorectal Cancer | 0.004734064 | 2 | 0 | GAD |
Malignant neoplasm of liver | 0.004734064 | 2 | 0 | GAD |
hearing impairment | 0.002367032 | 1 | 0 | GAD |
Hearing Loss, Partial | 0.002367032 | 1 | 0 | GAD |
Drug Allergy | 0.002367032 | 1 | 0 | GAD |
Tobacco Use Disorder | 0.002367032 | 1 | 0 | GAD |
Hearing Loss | 0.002367032 | 1 | 0 | GAD |
Infection | 0.002367032 | 1 | 0 | GAD |
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