Gill Erin E, Fast Naomi M
Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada.
Gene. 2006 Jun 21;375:103-9. doi: 10.1016/j.gene.2006.02.023. Epub 2006 Mar 20.
Microsporidia are unicellular eukaryotes that are obligate parasites of a variety of animals. For many years, microsporidia were thought to be an early offshoot of the eukaryotic evolutionary tree, and early phylogenetic work supported this hypothesis. More recent analyses have consistently placed microsporidia far from the base of the eukaryotic tree and indicate a possible fungal relationship, but the nature of the microsporidian-fungal relationship has yet to be determined. The concatenated dataset employed in this analysis consists of eight genes and contains sequence data from representatives of four fungal phyla. A consistent branching pattern was recovered among four different phylogenetic methods. These trees place microsporidia as a sister to a combined ascomycete+basidiomycete clade. AU tests determined that this branching pattern is the most likely, but failed to reject two alternatives.
微孢子虫是单细胞真核生物，是多种动物的专性寄生虫。多年来，微孢子虫被认为是真核进化树的一个早期分支，早期的系统发育研究支持了这一假设。最近的分析一致表明，微孢子虫远离真核树的基部，并显示出可能与真菌存在亲缘关系，但微孢子虫与真菌的关系性质尚未确定。本分析中使用的串联数据集由八个基因组成，包含来自四个真菌门代表的序列数据。在四种不同的系统发育方法中都恢复了一致的分支模式。这些树将微孢子虫置于子囊菌+担子菌组合分支的姐妹位置。似然比检验确定这种分支模式是最有可能的，但未能排除另外两种可能性。
