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In order to make optimal use of storage and minimize memory requirements, for each N1N2N3…N15N16(N17N18N19N20)- PAM we use a bit vector to represent each of: the string N17N18N19N20, the chromosome id, the strand id, the chromosome location, and the actual PAM string.
The more general version of the problem has as follows: "given a potentially large genome sequence G composed of four nucleotides (A, C, G, T), a query sequence Q, a PAM string, and a number M, identify and report all locations in G where the underlying sequence q is exactly the same length as Q, has M or fewer mismatches when compared to Q and is immediately followed by the given PAM".
For every pointer contained in a cell i of Table A we recover a location i´ of Table B. Then we reconstitute all of the strings N´1 N´16 N´´17 N´´18 N´´19 N´´208 N´´19 N´´20)- PAM´´ using the entries N´´17 N´´18 N´´19 N´´20- PAM´´ of Table B that start at position i´ and for which the user-selected PAM string matches PAM´´.
Similar(57)
For each off-target we also report the fully dereferenced instance of the PAM for PAM strings (e.g. NGG, NAG, NNNNACA) with unspecified nucleotides.
Generally, the user can select among several PAM strings and define the number of mismatches ahead of time.
Our scoring system reports the number of similar sequences in the genome with up to four mismatches (excluding the PAM region), summarized in a simple output string.
We use PAM in boldface as part of a nucleotide string to denote any of the oligonucleotide PAMs that are considered.
It is easy to determine how many 20-mer strings exist that look like AACTCCTGACCTCAGA-NNNN PAM.
He played in repertory theatres in Oxford, Cambridge, Leeds and Sheffield before joining the RSC in 1976, where he played a long string of supporting roles in Shakespeare and modern plays, including Pam Gems's Piaf.
Tables A and B effectively form groups out of all 20-mer strings that are present in the genome and are followed by PAM by using the first 16 nucleotides of each such 20-mer.
Pam: Yeah.
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CEO of Professional Science Editing for Scientists @ prosciediting.com