二倍体型及三倍体型卫氏并殖吸虫的DNA重复顺序的比较研究

从东北地区获得两类型卫氏并殖吸虫,提取其基因组DNA。用5种限制性内切酶消化,琼脂糖凝胶电泳后,观察两类型成虫基因组DNA的酶切片段。又用Southern印渍技术对两类型7种酶消化物的结果做了比较。显示两类型Bam HI、Hind Ⅲ及Eco RI的酶切结果基本相同,但Pst Ⅰ、DdeⅠ、HaeⅢ及HpaⅡ的结果却显示两类型的DNA重复顺序有明显差别。此结果在单个虫体DNA的杂交技术检测中也得到证实。

COMPARATIVE STUDIES ON THE REPETITIVE DNA SEQUENCES OF DIPLOID AND TRIPLOID FORMS OF PARAGONIMUS WESTERMANI BY RESTRICTION ENDONUCLEASE AND SOUTHERN BLOTTING

Restriction enzyme digestion of total genomic DNA of two chromosomes forms of Paragonimus westermani showed the presence of homologous highly repeated DNA in both diploid and triploid forms. Southern blotting analysis provided further evidence that the distribution of restriction enzyme sites (with 3 enzymes) on repetitive sequence of DNA of both forms were similar. However, with Pstl, Ddel, HaeIII and HpaII, their polymorphism revealed differences which were also found in each form tested separately with the hybridization technique. The present study, at the molecular level, supports the previously reported biological and biochemical results that they might be considered as different isolates or forms. It is suggested that PstI, DdeI, HaeIII and HpaII digestion pattern might be useful to distinguish the diploid from the triploid forms of Paragonimus westermani.