Intragenic DNA inversions expand bacterial coding capacity
Bacterial populations that originate from a single bacterium are not strictly clonal and often contain subgroups with distinct phenotypes 1 . Bacteria can generate heterogeneity through phase variation—a preprogrammed, reversible mechanism that alters gene expression levels across a population 1 . O...
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Published in | Nature (London) Vol. 634; no. 8032; pp. 234 - 242 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
03.10.2024
Nature Publishing Group |
Subjects | |
Online Access | Get full text |
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Summary: | Bacterial populations that originate from a single bacterium are not strictly clonal and often contain subgroups with distinct phenotypes
1
. Bacteria can generate heterogeneity through phase variation—a preprogrammed, reversible mechanism that alters gene expression levels across a population
1
. One well-studied type of phase variation involves enzyme-mediated inversion of specific regions of genomic DNA
2
. Frequently, these DNA inversions flip the orientation of promoters, turning transcription of adjacent coding regions on or off
2
. Through this mechanism, inversion can affect fitness, survival or group dynamics
3
,
4
. Here, we describe the development of PhaVa, a computational tool that identifies DNA inversions using long-read datasets. We also identify 372 ‘intragenic invertons’, a novel class of DNA inversions found entirely within genes, in genomes of bacterial and archaeal isolates. Intragenic invertons allow a gene to encode two or more versions of a protein by flipping a DNA sequence within the coding region, thereby increasing coding capacity without increasing genome size. We validate ten intragenic invertons in the gut commensal
Bacteroides thetaiotaomicron
, and experimentally characterize an intragenic inverton in the thiamine biosynthesis gene
thiC
.
Reversible DNA inversions found entirely within genes enable increased coding capacity by encoding multiple versions of a protein in bacteria and archaea. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0028-0836 1476-4687 1476-4687 |
DOI: | 10.1038/s41586-024-07970-4 |