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2014 ; 78
(2
): 257-77
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Integrons: past, present, and future
#MMPMID24847022
Gillings MR
Microbiol Mol Biol Rev
2014[Jun]; 78
(2
): 257-77
PMID24847022
show ga
Integrons are versatile gene acquisition systems commonly found in bacterial
genomes. They are ancient elements that are a hot spot for genomic complexity,
generating phenotypic diversity and shaping adaptive responses. In recent times,
they have had a major role in the acquisition, expression, and dissemination of
antibiotic resistance genes. Assessing the ongoing threats posed by integrons
requires an understanding of their origins and evolutionary history. This review
examines the functions and activities of integrons before the antibiotic era. It
shows how antibiotic use selected particular integrons from among the
environmental pool of these elements, such that integrons carrying resistance
genes are now present in the majority of Gram-negative pathogens. Finally, it
examines the potential consequences of widespread pollution with the novel
integrons that have been assembled via the agency of human antibiotic use and
speculates on the potential uses of integrons as platforms for biotechnology.