Diversity of the type I-U CRISPR-Cas system in Bifidobacterium
The CRISPR-Cas system is widely distributed in prokaryotes and plays an important role in the adaptive immunity of bacteria and archaea. Bifidobacterium is an important component of the intestinal flora of humans and animals, and some species of this bacterium can be employed as food additives. Howe...
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Veröffentlicht in: | Archives of microbiology 2021-08, Vol.203 (6), p.3235-3243 |
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Sprache: | eng |
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Zusammenfassung: | The CRISPR-Cas system is widely distributed in prokaryotes and plays an important role in the adaptive immunity of bacteria and archaea.
Bifidobacterium
is an important component of the intestinal flora of humans and animals, and some species of this bacterium can be employed as food additives. However, the
Bifidobacterium
CRISPR-Cas system has not been fully elucidated to date. In this study, the genomes of 110 strains of
Bifidobacterium
were employed to research the diversity of the type I-U system. The 110 strains were divided into five groups according to the genes adjacent to the CRISPR locus, including group A, B, C, D and E. Strains in the intergroup had unique species classifications and MLST types. An evolutionary tree was constructed based on the conserved
cas4/cas1
fusion gene. The results showed that group A had a different evolutionary branch compared with the other groups and had a relatively low spacer number. Notably, group B, C and E had exhibited ABC transporter regulators in the genes adjacent to the CRISPR locus. ABC transporters play important roles in the exocytosis of many antibiotics and are involved in horizontal gene transfer. This mechanism may have promoted the evolution of
Bifidobacterium
and the horizontal gene transfer of the type I-U system, which may have promoted the generation of system diversity. In summary, our results help to elucidate the role of the type I-U system in the evolution of
Bifidobacterium
. |
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ISSN: | 0302-8933 1432-072X |
DOI: | 10.1007/s00203-021-02310-w |