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dbSNP Short Genetic Variations

Welcome to the Reference SNP (rs) Report

All alleles are reported in the Forward orientation. Click on the Variant Details tab for details on Genomic Placement, Gene, and Amino Acid changes. HGVS names are in the HGVS tab.

Reference SNP (rs) Report

This page reports data for a single dbSNP Reference SNP variation (RefSNP or rs) from the new redesigned dbSNP build.
Top of the page reports a concise summary for the rs, with more specific details included in the corresponding tabs below.
All alleles are reported in the Forward orientation. Use the Genomic View to inspect the nucleotides flanking the variant, and its neighbors.
For more information see Help documentation.


Current Build 155

Released April 9, 2021

Homo sapiens
chrMT:4104 (GRCh38.p13) Help

The anchor position for this RefSNP. Includes all nucleotides potentially affected by this change, thus it can differ from HGVS, which is right-shifted. See here for details.

Variation Type
SNV Single Nucleotide Variation
G=0.0218 (195/8952, ALFA)
G=0.1137 (236/2076, HGDP_Stanford)
A=0.00 (0/52, SGDP_PRJ)
Clinical Significance
Not Reported in ClinVar
Gene : Consequence
MT-ND1 : Synonymous Variant
MT-CO1 : 2KB Upstream Variant
MT-ND2 : 2KB Upstream Variant
0 citations
Genomic View
See rs on genome

Variant Details tab shows known variant placements on genomic sequences: chromosomes (NC_), RefSeqGene, pseudogenes or genomic regions (NG_), and in a separate table: on transcripts (NM_) and protein sequences (NP_). The corresponding transcript and protein locations are listed in adjacent lines, along with molecular consequences from Sequence Ontology. When no protein placement is available, only the transcript is listed. Column "Codon[Amino acid]" shows the actual base change in the format of "Reference > Alternate" allele, including the nucleotide codon change in transcripts, and the amino acid change in proteins, respectively, allowing for known ribosomal slippage sites. To view nucleotides adjacent to the variant use the Genomic View at the bottom of the page - zoom into the sequence until the nucleotides around the variant become visible.

Gene: MT-CO1, mitochondrially encoded cytochrome c oxidase I (plus strand) : 2KB Upstream Variant
Molecule type Change Amino acid[Codon] SO Term
MT NC_012920.1:m.4104A>G N/A N/A
MT NC_012920.1:m.4104A>G L [CTA] > L [CTG] Coding Sequence Variant
NADH dehydrogenase subunit 1 YP_003024026.1:p.Leu266= L (Leu) > L (Leu) Synonymous Variant
MT NC_012920.1:m.4104A>G N/A N/A
Gene: MT-ND2, mitochondrially encoded NADH dehydrogenase 2 (plus strand) : 2KB Upstream Variant
Molecule type Change Amino acid[Codon] SO Term
MT NC_012920.1:m.4104A>G N/A N/A
MT NC_012920.1:m.4104A>G L [CTA] > L [CTG] Coding Sequence Variant
NADH dehydrogenase subunit 1 YP_003024026.1:p.Leu266= L (Leu) > L (Leu) Synonymous Variant
MT NC_012920.1:m.4104A>G N/A N/A
Gene: MT-ND1, mitochondrially encoded NADH dehydrogenase 1 (plus strand)
Molecule type Change Amino acid[Codon] SO Term
MT NC_012920.1:m.4104A>G N/A N/A
MT NC_012920.1:m.4104A>G L [CTA] > L [CTG] Coding Sequence Variant
NADH dehydrogenase subunit 1 YP_003024026.1:p.Leu266= L (Leu) > L (Leu) Synonymous Variant
MT NC_012920.1:m.4104A>G N/A N/A

Clinical Significance tab shows a list of clinical significance entries from ClinVar associated with the variation, per allele. Click on the RCV accession (i.e. RCV000001615.2) or Allele ID (i.e. 12274) to access full ClinVar report.

Not Reported in ClinVar

ALFA Allele Frequency
The ALFA project provide aggregate allele frequency from dbGaP. More information is available on the project page including descriptions, data access, and terms of use.

Release Version: 20201027095038
Population Group Sample Size Ref Allele Alt Allele
Total Global 8952 A=0.9782 G=0.0218
European Sub 6052 A=0.9942 G=0.0058
African Sub 572 A=0.818 G=0.182
African Others Sub 8 A=0.5 G=0.5
African American Sub 564 A=0.823 G=0.177
Asian Sub 56 A=1.00 G=0.00
East Asian Sub 26 A=1.00 G=0.00
Other Asian Sub 30 A=1.00 G=0.00
Latin American 1 Sub 0 A=0 G=0
Latin American 2 Sub 0 A=0 G=0
South Asian Sub 0 A=0 G=0
Other Sub 2272 A=0.9754 G=0.0246


Frequency tab displays a table of the reference and alternate allele frequencies reported by various studies and populations. Table lines, where Population="Global" refer to the entire study population, whereas lines, where Group="Sub", refer to a study-specific population subgroupings (i.e. AFR, CAU, etc.), if available. Frequency for the alternate allele (Alt Allele) is a ratio of samples observed-to-total, where the numerator (observed samples) is the number of chromosomes in the study with the minor allele present (found in "Sample size", where Group="Sub"), and the denominator (total samples) is the total number of all chromosomes in the study for the variant (found in "Sample size", where Group="Study-wide" and Population="Global").

Study Population Group Sample Size Ref Allele Alt Allele
HGDP-CEPH-db Supplement 1 Global Study-wide 2076 A=0.8863 G=0.1137
HGDP-CEPH-db Supplement 1 Est_Asia Sub 468 A=1.000 G=0.000
HGDP-CEPH-db Supplement 1 Central_South_Asia Sub 412 A=0.956 G=0.044
HGDP-CEPH-db Supplement 1 Middle_Est Sub 350 A=0.920 G=0.080
HGDP-CEPH-db Supplement 1 Europe Sub 318 A=1.000 G=0.000
HGDP-CEPH-db Supplement 1 Africa Sub 240 A=0.208 G=0.792
HGDP-CEPH-db Supplement 1 America Sub 216 A=1.000 G=0.000
HGDP-CEPH-db Supplement 1 Oceania Sub 72 A=1.00 G=0.00
SGDP_PRJ Global Study-wide 52 A=0.00 G=1.00

Aliases tab displays HGVS names representing the variant placements and allele changes on genomic, transcript and protein sequences, per allele. HGVS name is an expression for reporting sequence accession and version, sequence type, position, and allele change. The column "Note" can have two values: "diff" means that there is a difference between the reference allele (variation interval) at the placement reported in HGVS name and the reference alleles reported in other HGVS names, and "rev" means that the sequence of this variation interval at the placement reported in HGVS name is in reverse orientation to the sequence(s) of this variation in other HGVS names not labeled as "rev".

Placement A= G
MT NC_012920.1:m.4104= NC_012920.1:m.4104A>G
NADH dehydrogenase subunit 1 YP_003024026.1:p.Leu266= YP_003024026.1:p.Leu266=

Submissions tab displays variations originally submitted to dbSNP, now supporting this RefSNP cluster (rs). We display Submitter handle, Submission identifier, Date and Build number, when the submission appeared for the first time. Direct submissions to dbSNP have Submission ID in the form of an ss-prefixed number (ss#). Other supporting variations are listed in the table without ss#.

18 SubSNP, 3 Frequency submissions
No Submitter Submission ID Date (Build)
1 TSC-CSHL ss1422755 Oct 13, 2000 (86)
2 SC_JCM ss4040971 Sep 28, 2001 (100)
3 TSC-CSHL ss5583134 Oct 10, 2002 (126)
4 SSAHASNP ss35482900 May 24, 2005 (125)
5 BROAD ss46525672 Mar 10, 2006 (126)
6 ILLUMINA ss66863448 Dec 01, 2006 (130)
7 ILLUMINA ss66931986 Dec 01, 2006 (130)
8 ILLUMINA ss68074756 Dec 12, 2006 (130)
9 ILLUMINA ss70458808 May 24, 2008 (130)
10 ILLUMINA ss70979348 May 17, 2007 (130)
11 ILLUMINA ss75876513 Dec 07, 2007 (129)
12 AFFY ss76713274 Dec 07, 2007 (129)
13 HGSV ss85004638 Dec 15, 2007 (130)
14 ILLUMINA ss410884131 Sep 27, 2011 (147)
15 TISHKOFF ss567117931 Apr 25, 2013 (138)
16 AFFY ss2986125521 Oct 12, 2018 (152)
17 HGDP ss3847966401 Apr 27, 2020 (154)
18 SGDP_PRJ ss3892818931 Apr 27, 2020 (154)
19 HGDP-CEPH-db Supplement 1 NC_001807.4 - 4105 Apr 27, 2020 (154)
20 SGDP_PRJ NC_012920.1 - 4104 Apr 27, 2020 (154)
21 ALFA NC_012920.1 - 4104 Apr 26, 2021 (155)

History tab displays RefSNPs (Associated ID) from previous builds (Build) that now support the current RefSNP, and the dates, when the history was updated for each Associated ID (History Updated).

Associated ID History Updated (Build)
rs4133539 Mar 10, 2006 (126)
rs41466247 May 24, 2008 (130)
rs60494550 May 24, 2008 (130)
rs193303032 Feb 12, 2016 (147)
Added to this RefSNP Cluster:
Submission IDs Observation SPDI Canonical SPDI Source RSIDs
644293, ss35482900, ss76713274, ss85004638, ss3847966401 NC_001807.4:4104:A:G NC_012920.1:4103:A:G (self)
44835911, 12698829973, ss1422755, ss4040971, ss5583134, ss46525672, ss66863448, ss66931986, ss68074756, ss70458808, ss70979348, ss75876513, ss410884131, ss567117931, ss2986125521, ss3892818931 NC_012920.1:4103:A:G NC_012920.1:4103:A:G (self)

Publications tab displays PubMed articles citing the variation as a listing of PMID, Title, Author, Year, Journal, ordered by Year, descending.

No publications for rs1117205


The Flanks tab provides retrieving flanking sequences of a SNP on all molecules that have placements.

No flank sequence available

Genomic regions, transcripts, and products
Top Help

NCBI Graphical Sequence Viewer display of the genomic region, transcripts and protein products for the reported RefSNP (rs).
Use the zoom option to view the nucleotides around the RefSNP and find other neighboring RefSNPs.
Visit Sequence Viewer for help with navigating inside the display and modifying the selection of displayed data tracks.

Software version is: 2.0.1.post596+ae089ad