From Science 2.0:
A University of Granada researcher has a new hypothesis concerning why
bacteria seem to becoming increasingly more resistant to antibiotics.
Bacteria are incredibly versatile - they have been found in some of the
most extreme conditions on the planet, and it may be just evolution in
action. In this instance, Mohammed Bakkali, a scientist in the Genetics
Department at the Faculty of Science of the UGR,
believes that bacteria that are non-resistant to antibiotics acquire
resistance 'accidentally' because they take up the DNA of others that
are resistant, due to the stress to which they are subjected.
Like anything else, too much of a good thing can be bad and overuse and
misuse of antibiotics has exacerbated resistance problems. Whereas we
mistakenly banned the use of DDT due to misuse, antibiotics are not
going away, so researchers have spent decades examining when, how and
why bacteria take up DNA from other antibiotic-resistant bacteria, thus
becoming resistant. The answers as to when there is DNA uptake (in
unfavorable or stressful circumstances) and as to how the bacteria take
it up are clear, but, up until now, "nobody has pinpointed the reason
why bacteria ingest this genetic material" Bakkali notes.
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