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藏鸡胚胎的低氧适应特征及其血红蛋白突变效应 被引量:5

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摘要 藏鸡能在4200 m以上海拔正常繁衍生息, 但低地鸡在模拟4200 m海拔(12.0%O2)条件下孵化却只有3.0%的孵化率.在两品种全期低氧和阶段低氧模拟孵化实验中, 4200 m全期低氧揭示4~11天是隐性白与藏鸡阶段存活率相差最悬殊的阶段, 12~21天相差极显著, 1~3天相差不显著.但4200 m阶段低氧只能造成两品种孵化率显著差异, 而并不足以造成低氧阶段间阶段死亡率显著差异, 结果显示藏鸡具有优越的克服低氧损害后期不良影响的能力.对藏鸡和隐性白鸡血红蛋白7条链全部编码序列进行多态分析, 筛选到?D链编码基因的一个低氧功能突变位点(Met- 2D(B13)-Leu).该突变基因为藏鸡独有, 其频率随着海拔升高而升高, 而且该突变基因频率越高的群体, 孵化率越高.以鸡的HbD晶体为模板, 对突变血红蛋白结构和功能进行了同源预测, 结果表明Leu替代Met提供了一个更疏水环境, 有利于血红素的稳定, 从而提高了血红蛋白的血氧亲和力.突变(Met-32D(B13)-Leu)发生的时间和地点与藏鸡家养化时间和地点密切相关.
出处 《中国科学(C辑)》 CSCD 北大核心 2005年第4期333-339,共7页 Science in China(Series C)
基金 教育部科学技术重大项目(编号:10404)资助
作者简介 E-mail:chxwu@public.bta.net.cn
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