[关键词] 精神分裂症/遗传学;受体,多巴胺;多态现象;外显子
[中图分类号] R749.3 [文献标识码] A
[文章编号] 1000-1530(2000)05-0455-03
Disequilibrium transmission of Ser9Gly polymorphism of Do pamine D3 receptor gene in 151 schizophrenia families
ZHOU Ru-Lun HU Xian-Zhang ZHOU Chao-Feng HAN Yong-Hua CHEN Chang-Hui WANG Yu-Feng SHEN Yu-Cun
(Peking University Institute of Mental Health, Beijing 100083, China)
ABSTRACT Objective: To investigate the asso ciation between Ser9Gly polymorphism of dopamine D3 receptor gene (DRD3) and schizophrenia. M etho ds: The Ser9Gly polymorphism of DRD3 was tested in 151 Chinese Han's pe digrees each of which had two or more affected schizophrenia siblings who fulfilled the ICD-10 criteria with the parents alive and at most only one of whose parents may have the history of suffering schizophrenia. Results: (1) Totally, the distributions of alleles o r genotypes of DRD3 Ser9Gly polymorphism are not significantly different between the groups of paren ts, unaffected-siblings and affected-siblings, and between the sub-types of schi zophrenia. (2) The transmission disequilibrium test (TDT) shows the transmission disequilib rium in affected-siblings (χ2 = 7.76, P = 0.005 3, OR = 1.70, 95%IC: 1.15-2.52). (3) The correlation analysis was taken between genotypes and clinical status. The res ults show that schizophrenia siblings with Ser9 allele are apt to have negative symptoms. Conclusion: The results show that there may exist assoc iation between DRD3 and schizophrenia. This research supports that DRD3 may be one of the candidate gene s of schizophrenia.
KEY WORDS Schizophrenia/genet; Receptors, dopamine; Po lymorphism(genetics); Exons
(J Beijing Med Univ, 2000, 32:455-457)
多巴胺系统是精神分裂症生物学背景中引起最多关注的因素。近年来,对二者关系的基因水平研究呈现相互矛盾的结果,其中阴性结果居多,因此,对多巴胺假说尚需进一步探索。综合大量的研究结果,有理由认为,多巴胺系统在精神分裂症中具有难以替代的重要作用:(1)大多数抗精神病药通过多巴胺受体发挥作用是一个不争的事实;(2)动物实验中提高多巴胺水平可以产生类似精神分裂样症状,可重复性比较稳定;(3)尽管基因水平研究中大多数属于阴性结果,但有若干阳性报道来自于大样本、亚型分类的研究;(4)有相当多的阴性报道中,多巴胺受体基因与症状群或症状呈明显相关。因而利用大规模样本对多巴胺系统进行深入细致地研究对进一步认识多巴胺系统在精神分裂症中的作用具有十分重要的意义。
