There are three ways the you can locate the partner numbers of a merged refSNP:
  • If you enter a retired rs number into the “Search for IDs” search text box on the dbSNP home page, the response page will state that the SNP has been merged, and will provide the new rs number and a link to the refSNP page for that new rs number.
  • You can retrieve a list of merged rs numbers from Entrez SNP. Just type “mergedrs” (without the quotation marks) in the text box at the top of the page and click the “go” button. ). You can limit the output to merged rs numbers within a certain species by clicking on the “Limits” tab and then selecting the organism you wish from the organism selection box. Each entry in the returned list will include the old rs numbers that has merged, and the new rs number it has merged into (with a link to the refSNPpage for the new rs number).
  • You can also review the RsMergeArch table for the merge partners of a particular species of interest, as it tracks all merge events that occur in dbSNP. This table is available on the dbSNP FTP site, a full description of of it can be found in the dbSNP Data Dictionary, and the column definitions are located in the dbSNP_main_table.sql.gz, which can be found in the shared‚Äč_schema directory of the dbSNP FTP site.

From: Chapter 5, The Single Nucleotide Polymorphism Database (dbSNP) of Nucleotide Sequence Variation

Cover of The NCBI Handbook
The NCBI Handbook [Internet].
McEntyre J, Ostell J, editors.
Bethesda (MD): National Center for Biotechnology Information (US); 2002-.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.