Development of a diagnostic DNA probe to detect Setaria digitata: The causative parasite of cerebrospinal nematodiasis in goats, sheep and horses

W.S.S. Wijesundera, N.V. Chandrasekharan, E.H. Karunanayake, S.P. Dharmasena
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引用次数: 15

Abstract

Two repetitive sequences (IpSdM and IpSdS) have been cloned andsequenced from the genome of Setaria digitata. When IpSdM (214 bp) and IpSdS (201 bp) were aligned, a high degree of homology (85%) was observed, indicating that they belong to the same family of repeats. IpSdM represents a complete repeating element while IpSdS consists of two partial repeating elements arranged in tandem. The elements are present in about 10 000 copies comprising 2.8% of the S. digilata genome. As a diagnostic probe IpSdM detects as little as 100 pg DNA of both S. digilata and S. labiato-papillosa. It can also detect a single microfilaria and a L3 larva making it a valuable tool to monitor cattle and mosquito vector populations in the prevention of cerebrospinal nematodiasis.

一种用于检测山羊、绵羊和马的脑脊液线虫病的致病寄生虫——狗尾草(Setaria digitata)诊断性DNA探针的研制
从狗尾草(Setaria digitata)基因组中克隆了两个重复序列(IpSdM和IpSdS)并进行了测序。当IpSdM (214 bp)和IpSdS (201 bp)比对时,发现它们具有高度的同源性(85%),表明它们属于同一个重复序列家族。IpSdM代表一个完整的重复元素,而ipsd由两个部分重复元素串联组成。这些元素存在于大约1万个拷贝中,占digilata基因组的2.8%。作为一种诊断探针,IpSdM可以检测到低至100 pg的数字链球菌和唇乳头链球菌的DNA。它还可以检测单个微丝虫和L3幼虫,使其成为监测牛和蚊子媒介种群以预防脑脊液线虫病的宝贵工具。
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