中文摘要：

2,3,7,8-四氯二苯并对二恶英（2,3,7,8-Tetrach lorodibenzo-p-Dio xin,TCDD）是一种持久性环境有机污染物质,它在有机体内的蓄积性引起研究人员的重视.以青鳉胚胎作为实验动物模型,使用原位杂交和定量聚合酶链锁反应（Polymerase ChainReaction,PCR）技术从分子水平探讨了TCDD对胚胎耳泡的发育及其毒性作用机制.结果表明,TCDD造成青鳉幼鱼耳泡生成障碍.通过原位杂交和qPCR分析表明,TCDD引起软骨发育的变化与SOX9b表达降低有密切的关联.研究认为青鳉胚胎是一种非常敏感的TCDD模式动物,其耳泡软骨发育以及SOX9b基因表达可能是一种二恶英发育毒性的效应标记物.

英文摘要：

2,3,7,8-tetrachlorodenzo-p-dioxin （TCDD） is one of persistent organic pollutants in the environment and have bioaccumulation. Medaka embryos were used as a testing platform, we explored the relationship between TC- DD exposure and development of the otic vesicle. In this study, we employed both in situ hybridization and RT-PCR techniques to investigate the relationship between SOX9b expression and TCDD exposure during development of otic vesicle in medaka embryos. Our results showed that exposure of TCDD caused suppression in formation of otic vesicle in medka embryos. By in situ hybridization and RT-PCR analyses, we can relate changes of cartilage development caused by TCDD with the reduced expression of SOX9b. These results indicated that otic vesicle carti lage development and SOXgb expression are potential biomarkers for TCDD toxicity.