Examining the neighborhood of the gene of interest is the first step in the analysis. Genome browsers at NCBI (Map Viewer), ENSEMBL, and UCSC use different design strategies to to display a gene's chromosomal context, so it is worth trying all of them to find the one which you find most intuitive.

For this example, open the UCSC Genome Browser (this link opens a new window) and choose the genome (organism) from which you would like to get a sequence. Set the assembly to the latest date. Under position, enter the locus name for which you would like to search. Hit the submit button.

 Mouse Genome Browser Gateway
 
UCSC Genome Browser created by Jim Kent, Charles Sugnet, Terry Furey, Robert Baertsch, Heather Trumbower, Angie Hinrichs, Fan Hsu, Hiram Clawson, Kate Rosenbloom, Brian Raney, Robert Kuhn, Donna Karolchik, David Haussler, and the Genome Bioinformatics Group of UC Santa Cruz.
Software Copyright (c) The Regents of the University of California. All rights reserved.
genome assembly position image width
Click here to reset the browser user interface settings to their defaults.

If the name that you enter does not bring up the locus that you expect, searching NCBI's Entrez Gene database will give the official name for a gene locus as well as other synonyms. ENSEMBL, SwissProt/TrEMBL, and DDBJ also provide easy searches for locus name synonyms.

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