The fission yeast species Schizosaccharomyces japonicus is currently divided into two varieties—S. japonicus var. japonicus and S. japonicus var. versatilis. Here we examine the var. versatilis isolate CBS5679. The CBS5679 genome shows 88% identity to the reference genome of S. japonicus var. japonicus at the coding sequence level, with phylogenetic analyses suggesting that it has split from the S. japonicus lineage 25 million years ago. The CBS5679 genome contains a reciprocal translocation between chromosomes 1 and 2, together with several large inversions. The products of genes linked to the major translocation are associated with ‘metabolism’ and ‘cellular assembly’ ontology terms. We further show that CBS5679 does not generate viable progeny with the reference strain of S. japonicus. Although CBS5679 shares closer similarity to the ‘type’ strain of var. versatilis as compared to S. japonicus, it is not identical to the type strain, suggesting population structure within var. versatilis. We recommend that the taxonomic status of S. japonicus var. versatilis is raised, with it being treated as a separate species, Schizosaccharomyces versatilis.

中文翻译：

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多功能裂殖酵母代表了裂殖酵母的独特进化谱系

裂殖酵母种类日本裂殖酵母目前分为两个品种——日本裂殖酵母变种（S. japonicus var. var.）。日本刺参和刺参变种。多才多艺。在这里我们检查 var。多功能菌株CBS5679。CBS5679 基因组与S. japonicus var. 的参考基因组具有 88% 的一致性。系统发育分析表明它在2500 万年前就从S. japonicus谱系中分离出来。CBS5679 基因组包含 1 号和 2 号染色体之间的相互易位，以及几个大的倒位。与主要易位相关的基因产物与“代谢”和“细胞组装”本体论术语相关。我们进一步表明，CBS5679 不能与参考菌株S. japonicus产生可存活的后代。尽管 CBS5679 与 var 的“型”菌株更为相似。与 S. japonicus相比，它与模式菌株并不相同，表明 var. versatilis内的群体结构。多才多艺。我们建议S. japonicus var. 的分类地位。Versatilis被饲养，并被视为一个单独的物种，即Schizosaccharomyces versatilis。