Researchers discover 'dormant' magnetosome genes in non-magnetic bacteria unibt
], this is, to our knowledge, the first evidence not only for the existence of silent genes encoding the biosynthesis of magnetic organelles in any non-MTB, but also prokaryotic organelles in general. Although we cannot completely rule out the possibility that these genes are expressed under yet unknown conditions in the native habitat of G2-11, the early observations of the enrichment culture by Okamura et al. [] also did not reveal any magnetic behavior.
Why were the magnetosome genes not eliminated in G2-11 although not conferring any selective advantage to the host []? Several of our findings provide a likely explanation. Since approximately half of the genes within the MGCs of G2-11 are not or only weakly transcribed, and expression of the second half is attenuated by asRNA, we hypothesize that their maintenance within the genome might be neutral to the strain fitness [].
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