Complete Genome Determination and Analysis of Acholeplasma Oculi Strain 19L, Highlighting the Loss of Basic Genetic Features in the Acholeplasmataceae

Overview

Journal BMC Genomics

Publisher Biomed Central

Specialty Genetics

Date 2014 Oct 26

PMID 25344468

Citations 6

Authors

Christin Siewert

Wolfgang R Hess

Bojan Duduk

Bruno Huettel

Richard Reinhardt

Carmen Buttner

Michael Kube

Affiliations

Soon will be listed here.

Abstract

Background: Acholeplasma oculi belongs to the Acholeplasmataceae family, comprising the genera Acholeplasma and 'Candidatus Phytoplasma'. Acholeplasmas are ubiquitous saprophytic bacteria. Several isolates are derived from plants or animals, whereas phytoplasmas are characterised as intracellular parasitic pathogens of plant phloem and depend on insect vectors for their spread. The complete genome sequences for eight strains of this family have been resolved so far, all of which were determined depending on clone-based sequencing.

Results: The A. oculi strain 19L chromosome was sequenced using two independent approaches. The first approach comprised sequencing by synthesis (Illumina) in combination with Sanger sequencing, while single molecule real time sequencing (PacBio) was used in the second. The genome was determined to be 1,587,120 bp in size. Sequencing by synthesis resulted in six large genome fragments, while the single molecule real time sequencing approach yielded one circular chromosome sequence. High-quality sequences were obtained by both strategies differing in six positions, which are interpreted as reliable variations present in the culture population. Our genome analysis revealed 1,471 protein-coding genes and highlighted the absence of the F1FO-type Na+ ATPase system and GroEL/ES chaperone. Comparison of the four available Acholeplasma sequences revealed a core-genome encoding 703 proteins and a pan-genome of 2,867 proteins.

Conclusions: The application of two state-of-the-art sequencing technologies highlights the potential of single molecule real time sequencing for complete genome determination. Comparative genome analyses revealed that the process of losing particular basic genetic features during genome reduction occurs in both genera, as indicated for several phytoplasma strains and at least A. oculi. The loss of the F1FO-type Na+ ATPase system may separate Acholeplasmataceae from other Mollicutes, while the loss of those genes encoding the chaperone GroEL/ES is not a rare exception in this bacterial class.

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