*I. Pe'er and R. Shamir, Tel Aviv University*

We have devised a polynomial algorithm that reconstructs the sequence, given the spectrum and a homologous sequence. This situation occurs, for example, in the identification of single nucleotide polymorphisms (SNPs), and whenever a homologue of the target sequence is known. The algorithm is robust, can handle errors in the spectrum and assumes no knowledge of the k-mer multiplicities. Our simulations show that with realistic levels of SNPs, the algorithm correctly reconstructs a target sequence of length up to 2000 nucleotides when a polymorphic sequence is known. The technique is generalized to handle profiles and HMMs as input instead of a single homologous sequence.

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