Diversity of the cell-wall associated genomic island of the archaeon Haloquadratum walsbyi.

Abstract:

BACKGROUND:Haloquadratum walsbyi represents up to 80% of cells in NaCl-saturated brines worldwide, but is notoriously difficult to maintain under laboratory conditions. In order to establish the extent of genetic diversity in a natural population of this microbe, we screened a H. walsbyi enriched metagenomic fosmid library and recovered seven novel version of its cell-wall associated genomic island. The fosmid inserts were sequenced and analysed. RESULTS:The novel cell-wall associated islands delineated two major clades within H. walsbyi. The islands predominantly contained genes putatively involved in biosynthesis of surface layer, genes encoding cell surface glycoproteins and genes involved in envelope formation. We further found that these genes are maintained in the population and that the diversity of this region arises through homologous recombination but also through the action of mobile genetic elements, including viruses. CONCLUSIONS:The population of H. walsbyi in the studied saltern brine is composed of numerous clonal lineages that differ in surface structures including the cell wall. This type of variation probably reflects a number of mechanisms that minimize the infection rate of predating viruses.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Martin-Cuadrado AB,Pašić L,Rodriguez-Valera F

doi

10.1186/s12864-015-1794-8

subject

Has Abstract

pub_date

2015-08-13 00:00:00

pages

603

issn

1471-2164

pii

10.1186/s12864-015-1794-8

journal_volume

16

pub_type

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