Abstract
“Candidatus Hepatoplasma crinochetorum” Ps is an extracellular symbiont residing in the hepatopancreas of the terrestrial isopod Porcellio scaber. Its genome is highly similar to that of the close relative “Ca. Hepatoplasma crinochetorum” Av from Armadillidium vulgare. However, instead of a clustered regularly interspaced short palindromic repeat (CRISPR)-Cas system, it encodes a type I restriction modification system.
Highlights
Terrestrial isopods (Crustacea: Isopoda) typically harbor uncultivated bacteria in their midgut glands, such as the alphaproteobacterial symbiont “Candidatus Hepatincola porcellionum” or the mollicute “Candidatus Hepatoplasma crinochetorum” [1, 2]
The genome sequence of “Ca. Hepatoplasma crinochetorum” strain Av, residing in the hepatopancreas of the pill-bug Armadillidium vulgare, was used to resolve the phylogenetic affiliation of “Candidatus Hepatoplasma” as a sister taxon to the Mycoplasma hominis group [5]
The draft genome sequence of “Ca. Hepatoplasma crinochetorum” Ps contains only 19 fewer coding sequences (CDSs) than the complete genome of strain Av, and based on OrthoMCL [11], clustering the two genomes shows that they differ only in 14 and 11 genes not contained in the respective other genome
Summary
Terrestrial isopods (Crustacea: Isopoda) typically harbor uncultivated bacteria in their midgut glands (hepatopancreas), such as the alphaproteobacterial symbiont “Candidatus Hepatincola porcellionum” or the mollicute “Candidatus Hepatoplasma crinochetorum” [1, 2]. “Ca. Hepatoplasma crinochetorum” is a stalk-forming bacterium, which is transmitted environmentally [3]. Being intimately associated with the epithelial surface of the hepatopancreas, it seems to be beneficial to its isopod host under low-nutrient conditions [4].
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