Helicosporidia: a genomic snapshot of an early transition to parasitism

• Autorzy: Sun Y. , Pombert J.-F.
• Języki publikacji: EN

Abstrakty

EN

Helicosporidia are gut parasites of invertebrates. These achlorophyllous, non-photosynthetic green algae are the first reported to infect insects. Helicosporidia are members of the green algal class Trebouxiophyceae and are further related to the photosynthetic and non-photosynthetic genera Auxenochlorella and Prototheca, respectively, the latter of which can also turn to parasitism under opportunistic conditions. Molecular analyses suggest that Helicosporidia diverged from other photosynthetic trebouxiophytes less than 200 million years ago and that its adaptation to parasitism is therefore recent. In this minireview, we summarize the current knowledge of helicosporidian genomics. Unlike many well-known parasitic lineages, the Helicosporidium sp. organelle and nuclear genomes have lost surprisingly little in terms of coding content aside from photosynthesis-related genes. While the small size of its nuclear genome compared to other sequenced trebouxiophycean representatives suggests that Helicosporidium is going through a streamlining process, this scenario cannot be ascertained at this stage. Genome expansions and contractions have occurred independently multiple times in the green algae, and the small size of the Helicosporidium genome may reflect a lack of expansion from a lean ancestor state rather than a tendency towards reduction.

Słowa kluczowe

EN

Helicosporidium; green alga; alga; comparative genomics; entomopathogen; parasitism; parasite; invertebrate

• Wydawca: -
• Czasopismo: Acta Societatis Botanicorum Poloniae
• Rocznik: 2014
• Tom: 83
• Numer: 4
• Opis fizyczny: p.377-385,fig.,ref.

Twórcy

autor

Sun Y.

• Department of Biological and Chemical Sciences, Illinois Institute of Technology, Chicago, IL 60616, USA

autor

Pombert J.-F.

• Department of Biological and Chemical Sciences, Illinois Institute of Technology, Chicago, IL 60616, USA

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Identyfikatory

DOI

10.5586/asbp.2014.039