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首页> 外文期刊>Journal of bacteriology >High Spontaneous Mutation Rate in the Hyperthermophilic Archaeon Sulfolobus solfataricus Is Mediated by Transposable Elements
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High Spontaneous Mutation Rate in the Hyperthermophilic Archaeon Sulfolobus solfataricus Is Mediated by Transposable Elements

机译:高温度自发突变古菌Sulfolobus solfataricus中的高自发突变率介导的转座元素。

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We have isolated uracil-auxotrophic mutants of the hyperthermophilic archaeon Sulfolobus solfataricus in order to explore the genomic stability and mutational frequencies of this organism and to identify complementable recipients for a selectable genetic transformation system. Positive selection of spontaneous mutants resistant to 5-fluoroorotate yielded uracil auxotrophs with frequencies of between 10?4 and 10?5 per sensitive, viable cell. Four different, nonhomologous insertion sequences (ISs) were identified at different positions within the chromosomal pyrEF locus of these mutants. They ranged in size from 1,058 to 1,439 bp and possessed properties typical of known transposable elements, i.e., terminal inverted repeats, flanking duplicated target sequences, and putative transposase genes encoding motifs that are indicative of the IS4-IS5 IS element families. Between 12 and 25 copies of each IS element were found in chromosomal DNAs by Southern analyses. While characteristic fingerprint patterns created by IS element-specific probes were observed with genomic DNA of different S. solfataricusstrains, no homologous sequences were identified in DNA of other well-characterized strains of the order Sulfolobales.
机译:我们已经分离了超嗜热古细菌 Sulfolobus solfataricus 的尿嘧啶营养缺陷型突变体,以探索该生物的基因组稳定性和突变频率,并为可选择的遗传转化系统确定互补受体。对5-氟乳清酸盐具有抗性的自发突变体的正选择产生尿嘧啶营养缺陷型,每个敏感的,有活力的细胞的频率在10 4 和10 ?5 之间。在这些突变体的染色体 pyrEF 基因座的不同位置鉴定了四个不同的非同源插入序列(ISs)。它们的大小从1,058到1,439 bp不等,并具有已知转座因子的典型特性,即末端反向重复序列,侧翼重复的靶序列和假定的转座酶基因,其编码指示IS 4 -的基序。 IS 5 IS元素族。通过Southern分析,在染色体DNA中发现每个IS元件有12至25个拷贝。虽然观察到由IS元素特异性探针产生的特征性指纹图谱,但具有不同 S基因组DNA。沙门氏菌菌株,在其他 Sulfolobales 菌株中没有发现同源序列。

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