Dhx8,也称为DEAH-box helicase 8,是一种DEAH-box RNA解旋酶,属于DEAH-box RNA解旋酶家族。DEAH-box RNA解旋酶是一类重要的RNA代谢酶,参与RNA的转录、剪接、转运、翻译和降解等过程。Dhx8在多种细胞过程中发挥重要作用,包括细胞增殖、基因组稳定性维持、有机体发育和免疫反应等。
Dhx8在RNA剪接中发挥重要作用。Dhx8与剪接体相关因子DHX8和SRRM2相互作用,确保前mRNA的有效剪接和姐妹染色单体粘合。在Dhx8缺失的细胞中,前mRNA的剪接不完整,导致姐妹染色单体分离异常、基因组不稳定和细胞增殖停滞。此外,Dhx8还参与剪接体的组装和拆卸循环,与U12型内含子3'剪接位点的使用有关[3][4]。
Dhx8还与细胞分裂过程相关。在斑马鱼中,Dhx8突变导致多种血液学缺陷,包括造血缺陷和细胞分裂缺陷。Dhx8突变体斑马鱼胚胎缺乏循环血细胞类型,并且由于细胞分裂缺陷而死亡。Dhx8突变导致许多基因的剪接缺陷,包括一些造血基因。此外,Dhx8敲低的人细胞也显示出细胞分裂缺陷,表现为有丝分裂纺锤体紊乱和多极纺锤体形成[5]。
Dhx8还与某些疾病的发生发展相关。在遗传性乳腺癌和卵巢癌综合征患者中,BRCA1基因外显子1-19的串联重复与Dhx8基因外显子2相关[2]。此外,Dhx8在胃癌的恶性进展中也发挥作用。circDHX8通过与RNF5相互作用,抑制RNF5介导的ATG2B降解,促进细胞自噬和胃癌的恶性进展[6]。
Dhx8还与抗抑郁药反应相关。基因水平关联分析表明,Dhx8与抗抑郁药反应显著相关。这表明Dhx8可能参与了抗抑郁药反应的调控[1]。
综上所述,Dhx8是一种重要的DEAH-box RNA解旋酶,在RNA剪接、细胞分裂和某些疾病的发生发展中发挥重要作用。Dhx8的研究有助于深入理解RNA代谢和疾病发生机制,为疾病的治疗和预防提供新的思路和策略。
参考文献:
1. Pain, Oliver, Hodgson, Karen, Trubetskoy, Vassily, McIntosh, Andrew M, Lewis, Cathryn M. . Identifying the Common Genetic Basis of Antidepressant Response. In Biological psychiatry global open science, 2, 115-126. doi:10.1016/j.bpsgos.2021.07.008. https://pubmed.ncbi.nlm.nih.gov/35712048/
2. Du, Chen, Mark, Dorothea, Wappenschmidt, Barbara, Schlegelberger, Brigitte, Steinemann, Doris. 2018. A tandem duplication of BRCA1 exons 1-19 through DHX8 exon 2 in four families with hereditary breast and ovarian cancer syndrome. In Breast cancer research and treatment, 172, 561-569. doi:10.1007/s10549-018-4957-x. https://pubmed.ncbi.nlm.nih.gov/30191368/
3. Zanini, Isabella M Y, Soneson, Charlotte, Lorenzi, Luca E, Azzalin, Claus M. 2017. Human cactin interacts with DHX8 and SRRM2 to assure efficient pre-mRNA splicing and sister chromatid cohesion. In Journal of cell science, 130, 767-778. doi:10.1242/jcs.194068. https://pubmed.ncbi.nlm.nih.gov/28062851/
4. Norppa, Antto J, Chowdhury, Iftekhar, van Rooijen, Laura E, Varjosalo, Markku, Frilander, Mikko J. . Distinct functions for the paralogous RBM41 and U11/U12-65K proteins in the minor spliceosome. In Nucleic acids research, 52, 4037-4052. doi:10.1093/nar/gkae070. https://pubmed.ncbi.nlm.nih.gov/38499487/
5. English, Milton A, Lei, Lin, Blake, Trevor, Hickstein, Dennis, Liu, P Paul. 2012. Incomplete splicing, cell division defects, and hematopoietic blockage in dhx8 mutant zebrafish. In Developmental dynamics : an official publication of the American Association of Anatomists, 241, 879-89. doi:10.1002/dvdy.23774. https://pubmed.ncbi.nlm.nih.gov/22411201/
6. Wei, Guanxin, Chen, Xiang, Ruan, Tuo, Tao, Kaixiong, Wu, Chuanqing. 2024. Human gastric cancer progression and stabilization of ATG2B through RNF5 binding facilitated by autophagy-associated CircDHX8. In Cell death & disease, 15, 410. doi:10.1038/s41419-024-06782-8. https://pubmed.ncbi.nlm.nih.gov/38866787/