Efficient Design of Compact Unstructured RNA Libraries Covering All k-mers
Identifieur interne : 001287 ( Main/Curation ); précédent : 001286; suivant : 001288Efficient Design of Compact Unstructured RNA Libraries Covering All k-mers
Auteurs : Yaron Orenstein ; Bonnie BergerSource :
- Journal of Computational Biology [ 1066-5277 ] ; 2016.
Abstract
Url:
DOI: 10.1089/cmb.2015.0179
PubMed: 26713687
PubMed Central: 4752187
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-mers</title>
<author><name sortKey="Orenstein, Yaron" sort="Orenstein, Yaron" uniqKey="Orenstein Y" first="Yaron" last="Orenstein">Yaron Orenstein</name>
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<author><name sortKey="Berger, Bonnie" sort="Berger, Bonnie" uniqKey="Berger B" first="Bonnie" last="Berger">Bonnie Berger</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Efficient Design of Compact Unstructured RNA Libraries Covering All
<italic>k</italic>
-mers</title>
<author><name sortKey="Orenstein, Yaron" sort="Orenstein, Yaron" uniqKey="Orenstein Y" first="Yaron" last="Orenstein">Yaron Orenstein</name>
<affiliation><nlm:aff id="aff1"></nlm:aff>
</affiliation>
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<author><name sortKey="Berger, Bonnie" sort="Berger, Bonnie" uniqKey="Berger B" first="Bonnie" last="Berger">Bonnie Berger</name>
<affiliation><nlm:aff id="aff1"></nlm:aff>
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<series><title level="j">Journal of Computational Biology</title>
<idno type="ISSN">1066-5277</idno>
<idno type="eISSN">1557-8666</idno>
<imprint><date when="2016">2016</date>
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<front><div type="abstract" xml:lang="en"><title>Abstract</title>
<p><bold>Current microarray technologies to determine RNA structure or measure
protein–RNA interactions rely on single-stranded, unstructured RNA probes
on a chip covering together all <italic>k</italic>
-mers. Since space on the array
is limited, the problem is to efficiently design a compact library of unstructured
<italic>ℓ</italic>
-long RNA probes, where each <italic>k</italic>
-mer is
covered at least <italic>p</italic>
times. Ray et al. designed such a library for
specific values of <italic>k</italic>
, <italic>ℓ</italic>
, and
<italic>p</italic>
using ad-hoc rules. To our knowledge, there is no general
method to date to solve this problem. Here, we address the problem of finding a
minimum-size covering of all <italic>k</italic>
-mers by
<italic>ℓ</italic>
-long sequences with the desired properties for any value
of <italic>k</italic>
, <italic>ℓ,</italic>
and <italic>p</italic>
. As we
prove that the problem is NP-hard, we give two solutions: the first is a greedy
algorithm with a logarithmic approximation ratio; the second, a heuristic greedy
approach based on random walks in de Bruijn graphs. The heuristic algorithm works
well in practice and produces a library of unstructured RNA probes that is only
∼1.1-times greater in size compared to the theoretical lower bound. We
present results for typical values of <italic>k</italic>
and probe lengths
<italic>ℓ</italic>
and show that our algorithm generates a library that
is significantly smaller than the library of Ray et al.; moreover, we show that
our algorithm outperforms naive methods. Our approach can be generalized and
extended to generate RNA or DNA oligo libraries with other desired properties. The
software is freely available online.</bold>
</p>
</div>
</front>
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