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Beginner's Guide to BLAST

Beginner's Guide to BLAST

Beginner's Guide to BLAST

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Query Sequence<br />

Suppose that probe set Gma.2019.1.S1_at was<br />

identified as representing a gene of interest.<br />

From the Affymetrix website we can find the<br />

target sequence:<br />

CCAAGTTCGAGACCCTTATTGACATTTCAGTGATAGAGATATTGTCAA<br />

GGCATGCTTCTGATGAGGTCTACCTTGGCCAAAGGGATAATCCAAATT<br />

GGACTACGGATTCAAAGGCATTGGAAGCTTTCAAAAAGTTTGGAAACA<br />

AACTGGCAGAAATTGAGGGAAAAATCACACAGAGGAACAATGATCCAA<br />

GTCTGAAAAGCCGACATGGGCCAGTTCAGCTTCCATACACATTGCTCC<br />

ATCGTTCAAGTGAGGAAGGGATGAGTTTCAAAGGAATTCCCAACAGTA<br />

TCTCCATCTAAAATGTGTGTGTGGTTTGCTTATCTATTGTG<br />

This sequence represents the gene for<br />

lipoxygenase in soybean. But does it match <strong>to</strong><br />

any known genes in Phaselous?<br />

15<br />

Nucleotide <strong>BLAST</strong> Search<br />

Enter Query Sequence: simply paste our<br />

query sequence in<strong>to</strong> the window.<br />

Choose Search Set:<br />

Database: Nucleotide Collection (nr/nt)<br />

Organism: Phaseolus vulgaris (taxid:3885)<br />

Program Selection/Algorithm:<br />

Megablast (highly similar sequences)<br />

Discontiguous mega blast (more dissimilar<br />

seqeunces)<br />

Blanstn (somewhat similar sequences)<br />

16

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