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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
chr4:99318134 (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.

G>A / G>T
Variation Type
SNV Single Nucleotide Variation
A=0.000004 (1/264690, TOPMED)
A=0.000004 (1/251402, GnomAD_exome)
A=0.00000 (0/14050, ALFA) (+ 2 more)
T=0.00000 (0/14050, ALFA)
T=0.000 (0/326, HapMap)
Clinical Significance
Not Reported in ClinVar
Gene : Consequence
ADH1B : Missense Variant
1 citation
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.

Genomic Placements
Sequence name Change
GRCh38.p13 chr 4 NC_000004.12:g.99318134G>A
GRCh38.p13 chr 4 NC_000004.12:g.99318134G>T
GRCh37.p13 chr 4 NC_000004.11:g.100239291G>A
GRCh37.p13 chr 4 NC_000004.11:g.100239291G>T
ADH1B RefSeqGene NG_011435.1:g.8282C>T
ADH1B RefSeqGene NG_011435.1:g.8282C>A
Gene: ADH1B, alcohol dehydrogenase 1B (class I), beta polypeptide (minus strand)
Molecule type Change Amino acid[Codon] SO Term
ADH1B transcript variant 1 NM_000668.6:c.171C>T N [AAC] > N [AAT] Coding Sequence Variant
all-trans-retinol dehydrogenase [NAD(+)] ADH1B isoform 1 NP_000659.2:p.Asn57= N (Asn) > N (Asn) Synonymous Variant
ADH1B transcript variant 1 NM_000668.6:c.171C>A N [AAC] > K [AAA] Coding Sequence Variant
all-trans-retinol dehydrogenase [NAD(+)] ADH1B isoform 1 NP_000659.2:p.Asn57Lys N (Asn) > K (Lys) Missense Variant
ADH1B transcript variant 2 NM_001286650.2:c.51C>T N [AAC] > N [AAT] Coding Sequence Variant
all-trans-retinol dehydrogenase [NAD(+)] ADH1B isoform 2 NP_001273579.1:p.Asn17= N (Asn) > N (Asn) Synonymous Variant
ADH1B transcript variant 2 NM_001286650.2:c.51C>A N [AAC] > K [AAA] Coding Sequence Variant
all-trans-retinol dehydrogenase [NAD(+)] ADH1B isoform 2 NP_001273579.1:p.Asn17Lys N (Asn) > K (Lys) Missense Variant

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 14050 G=1.00000 A=0.00000, T=0.00000
European Sub 9690 G=1.0000 A=0.0000, T=0.0000
African Sub 2898 G=1.0000 A=0.0000, T=0.0000
African Others Sub 114 G=1.000 A=0.000, T=0.000
African American Sub 2784 G=1.0000 A=0.0000, T=0.0000
Asian Sub 112 G=1.000 A=0.000, T=0.000
East Asian Sub 86 G=1.00 A=0.00, T=0.00
Other Asian Sub 26 G=1.00 A=0.00, T=0.00
Latin American 1 Sub 146 G=1.000 A=0.000, T=0.000
Latin American 2 Sub 610 G=1.000 A=0.000, T=0.000
South Asian Sub 98 G=1.00 A=0.00, T=0.00
Other Sub 496 G=1.000 A=0.000, T=0.000


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
TopMed Global Study-wide 264690 G=0.999996 A=0.000004
gnomAD - Exomes Global Study-wide 251402 G=0.999996 A=0.000004
gnomAD - Exomes European Sub 135348 G=0.999993 A=0.000007
gnomAD - Exomes Asian Sub 49004 G=1.00000 A=0.00000
gnomAD - Exomes American Sub 34586 G=1.00000 A=0.00000
gnomAD - Exomes African Sub 16256 G=1.00000 A=0.00000
gnomAD - Exomes Ashkenazi Jewish Sub 10076 G=1.00000 A=0.00000
gnomAD - Exomes Other Sub 6132 G=1.0000 A=0.0000
HapMap Global Study-wide 326 G=1.000 T=0.000
HapMap American Sub 120 G=1.000 T=0.000
HapMap African Sub 118 G=1.000 T=0.000
HapMap Asian Sub 88 G=1.00 T=0.00

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 G= A T
GRCh38.p13 chr 4 NC_000004.12:g.99318134= NC_000004.12:g.99318134G>A NC_000004.12:g.99318134G>T
GRCh37.p13 chr 4 NC_000004.11:g.100239291= NC_000004.11:g.100239291G>A NC_000004.11:g.100239291G>T
ADH1B RefSeqGene NG_011435.1:g.8282= NG_011435.1:g.8282C>T NG_011435.1:g.8282C>A
ADH1B transcript variant 1 NM_000668.6:c.171= NM_000668.6:c.171C>T NM_000668.6:c.171C>A
ADH1B transcript variant 1 NM_000668.5:c.171= NM_000668.5:c.171C>T NM_000668.5:c.171C>A
ADH1B transcript NM_000668.4:c.171= NM_000668.4:c.171C>T NM_000668.4:c.171C>A
ADH1B transcript variant 2 NM_001286650.2:c.51= NM_001286650.2:c.51C>T NM_001286650.2:c.51C>A
ADH1B transcript variant 2 NM_001286650.1:c.51= NM_001286650.1:c.51C>T NM_001286650.1:c.51C>A
all-trans-retinol dehydrogenase [NAD(+)] ADH1B isoform 1 NP_000659.2:p.Asn57= NP_000659.2:p.Asn57= NP_000659.2:p.Asn57Lys
all-trans-retinol dehydrogenase [NAD(+)] ADH1B isoform 2 NP_001273579.1:p.Asn17= NP_001273579.1:p.Asn17= NP_001273579.1:p.Asn17Lys

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#.

5 SubSNP, 4 Frequency submissions
No Submitter Submission ID Date (Build)
1 SNP500CANCER ss5586191 Mar 31, 2003 (113)
2 AFFY ss74812277 Aug 16, 2007 (128)
3 GNOMAD ss2734649187 Nov 08, 2017 (151)
4 TOPMED ss3437253031 Nov 08, 2017 (151)
5 TOPMED ss4624658256 Apr 26, 2021 (155)
6 gnomAD - Exomes NC_000004.11 - 100239291 Jul 13, 2019 (153)
7 HapMap NC_000004.12 - 99318134 Apr 26, 2020 (154)
8 TopMed NC_000004.12 - 99318134 Apr 26, 2021 (155)
9 ALFA NC_000004.12 - 99318134 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)
rs3181447 Jul 03, 2002 (106)
rs4134507 Nov 14, 2002 (109)
rs4986814 Apr 07, 2003 (113)
rs52833169 Sep 21, 2007 (128)
Added to this RefSNP Cluster:
Submission IDs Observation SPDI Canonical SPDI Source RSIDs
3757123, ss2734649187 NC_000004.11:100239290:G:A NC_000004.12:99318133:G:A (self)
462035812, 7611940811, ss4624658256 NC_000004.12:99318133:G:A NC_000004.12:99318133:G:A
2670347, 288818527, 7611940811, ss3437253031 NC_000004.12:99318133:G:T NC_000004.12:99318133:G:T (self)
ss5586191, ss74812277 NT_016354.19:24787011:G:T NC_000004.12:99318133:G:T (self)

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

1 citation for rs1041969
PMID Title Author Year Journal
19193628 ADH single nucleotide polymorphism associations with alcohol metabolism in vivo. Birley AJ et al. 2009 Human molecular genetics

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

Genome context:
Select flank length:

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