参考黑线仓鼠(Cricetulus barabensis)近缘种PPARβ的cDNA序列设计引物,采用RT-PCR法克隆得到黑线仓鼠PPARβ部分序列,并翻译成氨基酸.利用该结果与其他物种核苷酸及氨基酸序列进行相似性比较、构建系统进化树、一级结构分析、二级结构和空间结构预测.结果表明:得到的480 bp PPARβ序列包括部分外显子4,全部外显子5、6及部分外显子7;共编码159个氨基酸;除人之外,黑线仓鼠PPARβ基因与其他物种的核苷酸相似性均在88%-94%之间,氨基酸相似性均在90%以上;构建进化树得出,黑线仓鼠与鼠类亲缘关系最近,与人的亲缘关系最远;疏水性分析、二级结构预显示该编码区亲水性较强;二级结构、空间结构预测显示该序列含α螺旋较多;空间结构预测看出该段区域含两个典型的锌指结构.
以近缘种OPN的cDNA序列为参考设计引物,通过RT-PCR得到黑线姬鼠OPN部分序列,并将得到的cDNA序列翻译成氨基酸序列,注册到GenBank(登陆号:HM626723).利用该序列构建系统进化树,同时对其编码的蛋白质进行一级结构分析及二级结构预测.结果表明:克隆得到的209 bp OPN的序列,包括部分外显子4,全部的外显子5及部分外显子6;该段序列从第二个碱基开始翻译,共编码69个氨基酸;其一级结构中包括了一个由10个连续天冬氨酸组成的高度酸性区域,它对骨桥蛋白与羟基磷灰石之间的联系具有重要意义;二级结构中大部分为α螺旋,且具有亲水性;利用所得OPN序列构建的系统进化树显示黑线姬鼠与大鼠、小鼠亲缘关系最近,与鸡、鹌鹑亲缘关系最远,此结果与物种的进化关系相一致,本研究所得到的OPN序列将有助于对骨桥蛋白的作用机制研究及系统进行分析.
Marmota himalayana belongs to Rodentia,Sciuridae,Marmota.Plague plots virus usually were carried and diffused ...
WANG Lin-Lin~1 XU Jin-Hui~1 XUE Hui-Liang~1 WANG Yu-Shan~2 XU Lai-Xiang~1** 1.College of Life Science,Qufu Normal University,Qufu,Shandong 273165,China 2.Institute of Zoology,the Chinese Academy of Sciences,Bejing,100080,China
Age structure and seasonality influence the population fluctuations of small rodents.Age determines body weight and social experience,while seasonality regulates the duration of the breeding season and onset of sexual maturity in newborn offspring.Therefore,reproductive success and skew usually occur in different age groups.Brandt’s vole(Lasiopodomys brandtii)is a social,short-lived and seasonal breeding small rodent with a dramatic seasonal population fluctuation,but reproductive skew is not fully understood in this species.In the present study,we determined kinship in semi-natural enclosure populations using microsatellite markers based on genotyping,analyzed the reproductive skew between sexes and between overwintered and newborn voles,and monitored variation in male reproductive activity by testing fecal testosterone levels throughout the year.Overwintered voles had the most reproductive success along with a striking increase in the population size in the enclosures,with all biological fathers and 77.8%of biological mothers,which had 100%and 87%of the total offspring,respectively.Compared to overwintered voles,reproductive skews were significantly higher in potential overwintered and newborn parents,implying the possible reproductive suppression of newborn voles by dominant overwintered voles.Moreover,both heavier body weight and higher testosterone levels in overwintered males supported their potential social status in the population.Our study provided new evidence for reproductive skew and differentiation of postnatal gonadal development patterns of different age groups in Brandt’s vole.
Yan CHENDawei WANGNing LIXiangfa HUFei RENWeili HAOYing SONGXiaohui LIU
