山羊发情相关输卵管糖蛋白(gEGP)基因的克隆

哺乳动物的输卵管精心设计了一个独特的液体环境 ,使得雌、雄性生殖细胞的运输及最终成熟、受精和早期胚胎发育能够顺利进行 .其中有一种源于分泌细胞的蛋白—发情相关的输卵管糖蛋白 (ｅｓｔｒｕｓ ａｓｓｏｃｉａｔｅｄｏｖｉｄｕｃｔｕａｌｇｌｙｃｏｐｒｏｔｅｉｎ ,ＥＧＰ) ,自从Ｓｕｔｔｏｎ等于 1984年首次在绵羊中发现的[1] ,在其他的物种中 ,如 ,狒狒、人、小鼠、猕猴、牛、羊、猪、仓鼠等 ,也都有发现[2 ,3 ,4] .虽然已有实验数据证明 ,当卵子经过输卵管时 ,它们可与卵子的透明带 (ｚｏｎａｐｅｌｌｕｃｉｄａ ,ＺＰ)和 或卵黄周…

Cloning of the Goat (Capra hircus) Estrus-associated Oviductual Glycoprotein(gEGP) Gene

The goat estrus|associated oviductual glycoprotein(gEGP), which is an important secretary protein in oviduct, is directly associated with the zona pellucida of the ovulated oocyte and with the preimplantation embryo development. To elucidate the physiological function and fundamental mechanism,a goat genomic library, in which plague titer is 1^15×10+6 pfu/ml, was constructed. Then, with a probe derived from bovine EGP cDNA, the genomic library was screened and a 18 kb fragment containing the gEGP gene was obtained. After PCR with the primers based on the ovine EGP cDNA, two fragments of gEGP gene were obtained and then sequenced. The predicted exon sequence of gEGP gene shows 99 6%, 96 3%, 89 2%, 88 4%, 88 0%, 87 4%, 84 3%, 74 8% homology with the EGP cDNA of sheep, cow, pig, baboon, rhesus, human, hamster, mouse, respectively. Like the other members of EGP gene family, gEGP gene also has many properties of the chitinase super family, and demonstrates the phylogenetic and functional relativity of EGP family with chitinase family.