chr1-109603388-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_001377295.2(GNAT2):ā€‹c.1031T>Cā€‹(p.Ile344Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000137 in 1,605,572 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (ā˜…ā˜…).

Frequency

Genomes: š‘“ 0.0000066 ( 0 hom., cov: 32)
Exomes š‘“: 0.000014 ( 0 hom. )

Consequence

GNAT2
NM_001377295.2 missense

Scores

11
7
1

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 9.22
Variant links:
Genes affected
GNAT2 (HGNC:4394): (G protein subunit alpha transducin 2) Transducin is a 3-subunit guanine nucleotide-binding protein (G protein) which stimulates the coupling of rhodopsin and cGMP-phoshodiesterase during visual impulses. The transducin alpha subunits in rods and cones are encoded by separate genes. This gene encodes the alpha subunit in cones. [provided by RefSeq, Jul 2008]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2
Very rare variant in population databases, with high coverage;
PP3
MetaRNN computational evidence supports a deleterious effect, 0.928

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE UniProt
GNAT2NM_001377295.2 linkuse as main transcriptc.1031T>C p.Ile344Thr missense_variant 9/9 ENST00000679935.1
GNAT2NM_001379232.1 linkuse as main transcriptc.1031T>C p.Ile344Thr missense_variant 9/9
GNAT2NM_005272.5 linkuse as main transcriptc.1031T>C p.Ile344Thr missense_variant 8/8

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Appris UniProt
GNAT2ENST00000679935.1 linkuse as main transcriptc.1031T>C p.Ile344Thr missense_variant 9/9 NM_001377295.2 P1
GNAT2ENST00000351050.8 linkuse as main transcriptc.1031T>C p.Ile344Thr missense_variant 8/81 P1

Frequencies

GnomAD3 genomes
AF:
0.00000657
AC:
1
AN:
152166
Hom.:
0
Cov.:
32
show subpopulations
Gnomad AFR
AF:
0.00
Gnomad AMI
AF:
0.00
Gnomad AMR
AF:
0.00
Gnomad ASJ
AF:
0.00
Gnomad EAS
AF:
0.00
Gnomad SAS
AF:
0.00
Gnomad FIN
AF:
0.00
Gnomad MID
AF:
0.00
Gnomad NFE
AF:
0.0000147
Gnomad OTH
AF:
0.00
GnomAD3 exomes
AF:
0.0000119
AC:
3
AN:
251296
Hom.:
0
AF XY:
0.00000736
AC XY:
1
AN XY:
135820
show subpopulations
Gnomad AFR exome
AF:
0.00
Gnomad AMR exome
AF:
0.00
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.00
Gnomad SAS exome
AF:
0.00
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.0000264
Gnomad OTH exome
AF:
0.00
GnomAD4 exome
AF:
0.0000144
AC:
21
AN:
1453406
Hom.:
0
Cov.:
27
AF XY:
0.00000967
AC XY:
7
AN XY:
723560
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.0000190
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
AF:
0.00000657
AC:
1
AN:
152166
Hom.:
0
Cov.:
32
AF XY:
0.0000135
AC XY:
1
AN XY:
74340
show subpopulations
Gnomad4 AFR
AF:
0.00
Gnomad4 AMR
AF:
0.00
Gnomad4 ASJ
AF:
0.00
Gnomad4 EAS
AF:
0.00
Gnomad4 SAS
AF:
0.00
Gnomad4 FIN
AF:
0.00
Gnomad4 NFE
AF:
0.0000147
Gnomad4 OTH
AF:
0.00
Alfa
AF:
0.0000494
Hom.:
0
Bravo
AF:
0.0000151
ExAC
AF:
0.00000824
AC:
1
EpiCase
AF:
0.0000545
EpiControl
AF:
0.0000593

ClinVar

Significance: Uncertain significance
Submissions summary: Uncertain:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

Inborn genetic diseases Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingAmbry GeneticsMar 02, 2023The c.1031T>C (p.I344T) alteration is located in exon 8 (coding exon 8) of the GNAT2 gene. This alteration results from a T to C substitution at nucleotide position 1031, causing the isoleucine (I) at amino acid position 344 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -
not provided Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpMay 16, 2022This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 344 of the GNAT2 protein (p.Ile344Thr). This variant is present in population databases (rs753014058, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with GNAT2-related conditions. ClinVar contains an entry for this variant (Variation ID: 1058578). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Achromatopsia 4 Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingGenome-Nilou LabApr 11, 2023- -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
0.98
BayesDel_addAF
Pathogenic
0.38
D
BayesDel_noAF
Pathogenic
0.38
CADD
Pathogenic
26
DANN
Uncertain
1.0
DEOGEN2
Pathogenic
0.82
D
Eigen
Pathogenic
0.90
Eigen_PC
Pathogenic
0.85
FATHMM_MKL
Pathogenic
0.99
D
LIST_S2
Uncertain
0.96
D
M_CAP
Uncertain
0.15
D
MetaRNN
Pathogenic
0.93
D
MetaSVM
Uncertain
0.58
D
MutationAssessor
Uncertain
2.7
M
MutationTaster
Benign
1.0
D
PrimateAI
Pathogenic
0.90
D
PROVEAN
Uncertain
-4.3
D
REVEL
Pathogenic
0.92
Sift
Pathogenic
0.0
D
Sift4G
Uncertain
0.012
D
Polyphen
1.0
D
Vest4
0.94
MVP
0.96
MPC
1.1
ClinPred
1.0
D
GERP RS
5.5
Varity_R
0.88
gMVP
0.83

Splicing

Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
0.010
Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs753014058; hg19: chr1-110146010; API