Informace o publikaci

First ultrastructural and molecular phylogenetic evidence from the blastogregarines, an early branching lineage of plesiomorphic Apicomplexa

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SIMDYANOV Timur G. PASKEROVA Gita G. BARDŮNEK VALIGUROVÁ Andrea DIAKIN Andrei KOVÁČIKOVÁ Magdaléna SCHREVEL Joseph GUILLOU Laure DOBROVOLSKIJ Andrey A. ALEOSHIN Vladimir V.

Rok publikování 2018
Druh Článek v odborném periodiku
Časopis / Zdroj Protist
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.sciencedirect.com/science/article/pii/S1434461018300300
Doi http://dx.doi.org/10.1016/j.protis.2018.04.006
Klíčová slova Apicomplexa; blastogregarines; ultrastructure; plesiomorphic traits; molecular phylogeny;18S and 28S ribosomal DNAs
Popis Blastogregarines are poorly studied parasites of polychaetes superficially resembling gregarines, but lacking syzygy and gametocyst stages in the life cycle. Furthermore, their permanent multinuclearity and gametogenesis by means of budding considerably distinguish them from other parasitic Apicomplexa such as coccidians and hematozoans. The affiliation of blastogregarines has been uncertain: different authors considered them highly modified gregarines, an intermediate apicomplexan lineage between gregarines and coccidians, or an isolated group of eukaryotes altogether. Here, we report the ultrastructure of two blastogregarine species, Siedleckia nematoides and Chattonaria mesnili, and provide the first molecular data on their phylogeny based on SSU, 5.8S, and LSU rDNA sequences. Morphological analysis reveals that blastogregarines possess both gregarine and coccidian features. Several traits shared with archigregarines likely represent the ancestral states of the corresponding cell structures for parasitic apicomplexans: a distinctive tegument structure and myzocytotic feeding with a well-developed apical complex. Unlike gregarines but similar to coccidians however, the nuclei of male blastogregarine gametes are associated with two kinetosomes. Molecular phylogenetic analyses reveal that blastogregarines are an independent, early diverging lineage of apicomplexans. Overall, the morphological and molecular evidence congruently suggests that blastogregarines represent a separate class of Apicomplexa.
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