This help document answers the following questions:
What can I use the Mouse SNP Query Form to find?
MGI loads all mouse dbSNP assay data and RefSNP consensus data where allele values are specified for individual strains. dbSNP includes mouse SNP data where the nucleotide values are not specified for individual strains.
- MGI does not load dbSNP data for RefSNPs where all submitted SNP assays for the RefSNP have unspecified allele values for individual strains.
- If at least one submitted SNP assay for a mouse RefSNP has allele values specified for individual strains, MGI loads all submitted SNP assay data for the RefSNP, including assays that do not specify alleles, but such assays do not contribute to the consensus information.
You can use the Mouse SNP Query Form to search for mouse single nucleotide polymorphisms represented in dbSNP (including IN-DELS), using some or all of these criteria:
- strains and strain comparisons
- mapped position of a marker
- genomic region
- associated genes
Note: The query searches for RefSNP consensus information, not submitted SNP assay information, and only RefSNP consensus information data are returned. See SNP Terms and Concepts for details about RefSNPs, submitted SNP assays, and consensus data.
You can modify how your results are displayed and filter by dbSNP Function Class. See: Can I change the strain order in the query results? and How do I filter my results?.
How does genome coordinate discrepancy affect a query?
See Understanding Mouse SNP Coordinate Discrepancies.
How do I use this form to find SNPs?
The form has two tabs. One for searching with gene symbols and strains and the other for searching with genome coordinates and strains. To search for detailed data using this query form, enter or select values in one or more of the query form fields described in What values are acceptable in the each of the query form fields? After entering values in the form fields, click Search to submit the query. Click Reset to clear the fields and return any default values. See Using MGI Query Forms for additional information.
Are there specific requirements for using this form?
- For both search tabs, you must have at least one strain checked.
- You must choose values within the other sections to narrow your search for each tab: genome coordinates or SNPs located in or near genes. Each value that you enter restricts the results returned.
- Click Search to submit your query (or click Reset to clear the fields, return any default values, and start over).
The result is a Mouse SNPs Summary report listing all the SNPs found.
How do I know which dbSNP build I'm querying against?
The dbSNP build number appears at the top of the Mouse SNP Query Form.
How do I query using a SNP accession ID?
The easiest way to query using a SNP accession ID is to:
- Type or paste the SNP accession ID into the Quick Search box (top right on most MGI web pages).
- Click Quick Search.
- If MGI contains this SNP accession ID, it appears on a Quick Search Results page. Click SNP to access the MGI SNP Detail page.
How do I use the Strains and Strain Comparison lists?
See Strains and Strain Comparisons.
What is a Reference Strain?
A reference strain is the comparison strain to use for determining whether the SNPs Returned are the same as or different from your selected strain or to limit your search to RefSNPs with an allele value for that strain.
- The Reference Strain selection list can accept only one strain.
- If you add a reference strain you must also have at least one strain checked in the Find SNPs Involving these Strains section.
- If you select a reference strain, by default, the query returns only RefSNPs with an allele value for that strain.
- You can choose to return only SNPs that are different or the same as your reference strain.
- By default, the reference strain is the first strain listed in your results.
See Strains and strain comparisons for additional details.
Why isn't my strain in the Strains lists?
If the strain that interests you isn't listed, then there are no alleles for that strain in dbSNP.
What determines the sort order of the Strains?
The SNPs Involving these Strains list and the Reference Strain for Comparison list each contains 88 of the most common inbred strains in alphanumeric order.
Is there a limit on the number of SNPs that a query returns?
No. The query will return a paginated list of all SNPs that meet the search criteria.
What values are acceptable in each of the query form fields?
You must select or type a value for at least one of the following:
- Gene Symbol/Name in the Search by Gene tab
- Chromosome and Genome Coordinates in the Search by Region tab.
You must have at least one strain checked in the Find SNPs Involving these Strains section for either search tab.
|Associated genes||Use these parameters to locate SNPs within or near genes/markers.
- Enter the mouse gene symbol/name/synonym.
- This field supports the * (asterisk) as a wild-card. See Using Wild Cards on MGI Query Forms
- You can search for multiple genes by entering a comma-separated list.
- Use the default search (current symbols no search of names or synonyms) or toggle the choice to current symbols/names, synonyms and homologs to expand your search to symbols for other vertebrates and unofficial symbols. Note: If the symbol/name or synonym contains a comma, put the entire term in quotation marks to ensure that the search is on the exact phrase (example: "cyclin B1, related sequence").
|SNPs Located Near Genes
||When searching by gene symbol, SNPs within 2 kb of the gene(s) are returned by default. You can choose to limit your search to just within the gene(s) or to expand the range to within 10 kb of the gene(s).
The SNPs Located near Genes function returns SNPs located within the specified distance/orientation of the marker or markers that match the Gene Symbol/Name query.
Note: When there is a discrepancy between the genome coordinates of SNPs and MGI genes, this section of the field is disabled. For more information, see How does genome coordinate discrepancy affect my query?
- You must enter a Gene Symbol/Name to use this function.
- You may not use QTL symbols. SNPs are not associated with markers of type QTL. If you wish to search for SNPs within a QTL, use the Search by Region tab and search with coordinates that define the QTL.
|Strains and Strain Comparisons||Use this section to select strains to search, determine a Reference Strain to return by comparison (if desired), and to determine the SNPs Returned (same as or different from the reference strain, or all SNPs).
- All strains are selected by default.
- By default, no Reference Strain is selected. See: What is a Reference Strain?
- There are no disallowed combinations of strain and reference strain (except when they are the same).
- When you supply both a selected and a reference strain, the SNPs Returned default is to display all SNPs (both the same as and different from the reference strain allele).
- If you do not select a strain, the default is to consider all strains for the query. Strains returned are initially sorted in alphanumeric order, except if a reference strain is chosen, then it will be listed first.
- If you select a reference strain, by default, the query returns only RefSNPs with an allele value for the reference strain.
- If you do not select a reference strain, the allele values of any selected strains are not compared against one another in the query results.
The default selection is to return all SNPs relative to the reference strain allele (Not compared to the Reference Strain), though you can choose to return only those which are the same, or only those which are different. SNPs with conflicts are noted by underlining the allele or if there is not a consensus value, then a ? is displayed. See: Interpreting the MGI Mouse SNPs Results Table for more details on SNP alleles.
- If you select Same (or Different) from a reference strain, SNPs with conflicts are not returned.
- If you select more than one strain to compare to a reference strain and also choose to return only SNPs that are the Same (or Different), then only alleles that are the Same (or Different) for all the selected comparison strains and the reference strain will be returned.
||You must select a Chromosome and enter a range of genome coordinates (Examples: 125.618-125.622 Mbp; 1-125618205 bp; 125618205 - 200000000 bp; Use 0 - 200 Mbp for an entire Chr) to use the Search by Region tab. You can toggle between bp and Mbp ranges.
Can I edit my original options and requery?
Yes, you can.
- If you want to edit a list or change output options:
- When your results appear, click the banner at the top of the page (Click to modify search). (The banner title changes to Click to hide search.) The window that appears contains your original search criteria.
- Make your changes.
- Click Search.
- Repeat until the desired results appear.
- You can requery as many times as you like.
- Alternatively, click Reset to return to the original Mouse dbSNP Query form.
Do SNPs Located Near Genes include QTLs in the summary results?
No. SNPs are not associated with markers of type QTL. If you wish to search for SNPs within a QTL, use the Search by Region tab and search with coordinates that define the QTL.
No. Some SNPs in dbSNP have more than one location. These are not returned by the search form but the locations for the SNP can be found on the SNP Detail page which you can reach by searching for the SNP ID in the Quick Search field at the top of most MGI web pages.
How do I interpret SNP query results?
Can I change the strain order in the query results?
Yes. You can drag strain and other column headings at the top of the results table to rearrange them.
How do I filter my results?
You can filter results by dbSNP Function Class. Function Classes are assigned by dbSNP. Click here for a description of the dbSNP Function Classes. Click the "Filter SNPs by: dbSNP Function Class" button above your results and check the classes you wish to retain after filtering. If you have reordered columns, filtering will reset to the original order.
How do I retrieve my results as a tab-delimited text file?
In your search results, click on the Export: SNPs to Text File icon. Your web browser will download a file of the results that remain after any filtering you may have performed.
My query returned no results. Why?
See My SNP query returned no results. Why? for help reformulating a Mouse SNP query.