A gene family from Echinococcus granulosus differentially expressed in mature adult worms

文献类型： 外文期刊

第一作者： Zhang, WB

作者： Zhang, WB;Li, J;You, H;Zhang, ZZ;Turson, G;Loukas, A;McManus, DP

作者机构：

关键词： Echinococcus granulosus;differential gene expression;differential display;DDRT-PCR;RT-PCR;gene family

期刊名称：MOLECULAR AND BIOCHEMICAL PARASITOLOGY （ 影响因子：1.759； 五年影响因子：2.135 ）

ISSN： 0166-6851

年卷期： 2003 年 126 卷 1 期

页码：

收录情况： SCI

摘要： Differences in mRNA expression between immature adult worms (IAW) and mature adult worms (MAW) of Echinococcus granulosus were determined using polymerase chain reaction-based differential display (DDRT-PCR). Twenty-eight putative differential cDNA fragments were isolated, cloned and sequenced. mRNAs from IAW and MAW were probed with the labelled fragments. Six cDNA fragments (coded as egM12, egM13, egM22, egM26, egM30 and egM34) were putatively determined to be specific to MAW by Northern hybridisation. The stage-specificity of egM12, egM13 and egM34 was confirmed by RT-PCR. RNAs of IAW, MAW, protoscoleces and oncospheres, probed with egM13 and egM30, showed that the mRNAs were expressed exclusively in MAW, which implied involvement in the regulation of egg development. Using the labelled fragments to screen a cDNA library of MAW, 99 clones were identified and analysed. An alignment of selected clones showed that the MAW-specific mRNAs belonged to a family. Examination of the deduced amino acid sequence of three of the corresponding cDNAs (egM4, egM9 and egM123) indicated they were cysteine-rich and contained a 24 amino acid repeat sequence, repeated four to six times. The repeat regions were predominantly alpha helical in nature with interspersed turns, forming alternating zones of positive and negative charge. The functional significance of each of the cDNAs identified is unclear as none had significant sequence similarity to genes of known function. However, polypeptides encoded by egM4 and egM123 were recognised by antibodies in a serum pool from dogs experimentally infected with E. granulosus, suggesting they could prove of value in serodiagnosis of definitive hosts. (C) 2002 Elsevier Science B.V. All rights reserved.

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