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• W1644233668 abstract "Abstract Background Single nucleotide polymorphisms (SNPs) are locations at which the genomic sequences of population members differ. Since these differences are known to follow patterns, disease association studies are facilitated by identifying SNPs that allow the unique identification of such patterns. This process, known as haplotype tagging, is formulated as a combinatorial optimization problem and analyzed in terms of complexity and approximation properties. Results It is shown that the tagging problem is NP-hard but approximable within 1 + ln(( n 2 - n )/2) for n haplotypes but not approximable within (1 - ε ) ln( n /2) for any ε > 0 unless NP ⊂ DTIME( n log log n ). A simple, very easily implementable algorithm that exhibits the above upper bound on solution quality is presented. This algorithm has running time O (Equation missing<!-- image only, no MathML or LaTex -->(2 m - p + 1)) ≤ O ( m ( n 2 - n )/2) where p ≤ min( n , m ) for n haplotypes of size m . As we show that the approximation bound is asymptotically tight, the algorithm presented is optimal with respect to this asymptotic bound. Conclusion The haplotype tagging problem is hard, but approachable with a fast, practical, and surprisingly simple algorithm that cannot be significantly improved upon on a single processor machine. Hence, significant improvement in computatational efforts expended can only be expected if the computational effort is distributed and done in parallel." @default.
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• W1644233668 date "2006-01-09" @default.
• W1644233668 modified "2023-10-09" @default.
• W1644233668 title "Approximation properties of haplotype tagging" @default.
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• W1644233668 doi "https://doi.org/10.1186/1471-2105-7-8" @default.
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