rs79775494
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP3_Moderate
The NM_000212.3(ITGB3):c.836A>T(p.Lys279Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000186 in 1,613,978 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 (★★★).
Frequency
Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)
Exomes 𝑓: 0.0000014 ( 0 hom. )
Consequence
ITGB3
NM_000212.3 missense
NM_000212.3 missense
Scores
5
9
4
Clinical Significance
Conservation
PhyloP100: 1.81
Genes affected
ITGB3 (HGNC:6156): (integrin subunit beta 3) The ITGB3 protein product is the integrin beta chain beta 3. Integrins are integral cell-surface proteins composed of an alpha chain and a beta chain. A given chain may combine with multiple partners resulting in different integrins. Integrin beta 3 is found along with the alpha IIb chain in platelets. Integrins are known to participate in cell adhesion as well as cell-surface mediated signalling. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
PM1
?
In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_000212.3
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.938
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
ITGB3 | NM_000212.3 | c.836A>T | p.Lys279Met | missense_variant | 6/15 | ENST00000559488.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
ITGB3 | ENST00000559488.7 | c.836A>T | p.Lys279Met | missense_variant | 6/15 | 1 | NM_000212.3 | P1 | |
ITGB3 | ENST00000571680.1 | c.836A>T | p.Lys279Met | missense_variant | 6/9 | 1 | |||
ITGB3 | ENST00000696963.1 | c.836A>T | p.Lys279Met | missense_variant | 6/14 |
Frequencies
GnomAD3 genomes ? AF: 0.00000657 AC: 1AN: 152194Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251402Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135882
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GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461784Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1AN XY: 727194
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ClinVar
Significance: Uncertain significance
Submissions summary: Pathogenic:1Uncertain:2
Revision: reviewed by expert panel
LINK: link
Submissions by phenotype
Glanzmann thrombasthenia 2 Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Mar 01, 2010 | - - |
Glanzmann thrombasthenia Uncertain:1
Uncertain significance, reviewed by expert panel | curation | ClinGen Platelet Disorders Variant Curation Expert Panel, ClinGen | Aug 17, 2021 | The ITGB3 missense variant NM_000212.3:c.836A>T replaces the lysine residue with a methionine residue (p.Lys279Met) and is absent from control population databases. The variant is predicted by in silico tools to be damaging to protein function. The functional impact has been assessed by flow cytometric detection of αIIb, β3, and αIIbβ3 positive cells following transient transfection of ITGB3 cDNA carrying this variant, showing a reduction in the number cells positive for the αIIbβ3 complex (estimated to be ~7% compared to wild type; PMID: 20020534). This variant has been observed in heterozygosity in an individual suspected to have Glanzmann's thrombasthenia (GT) (CabGT-24 in PMID: 20020534), however sufficient information to confirm if the individual's phenotype is specific for GT was not provided and the second ITGB3 variant identified in the individual is of uncertain significance and unknown phase. In summary, this variant is of uncertain significance and lacks sufficient evidence to be classified as pathogenic or benign for GT. GT-specific criteria applied: PS3_supporting, PM2_supporting, PP3. - |
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jun 24, 2023 | 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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt ITGB3 protein function. ClinVar contains an entry for this variant (Variation ID: 13568). This missense change has been observed in individual(s) with Glanzmann thrombasthenia (PMID: 20020534). This variant is present in population databases (rs79775494, gnomAD 0.007%). This sequence change replaces lysine, which is basic and polar, with methionine, which is neutral and non-polar, at codon 279 of the ITGB3 protein (p.Lys279Met). - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Uncertain
Dann
Uncertain
DEOGEN2
Uncertain
D;.
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Uncertain
D
LIST_S2
Uncertain
D;D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D
MetaSVM
Pathogenic
D
MutationAssessor
Uncertain
M;.
MutationTaster
Benign
A;A;A;A
PrimateAI
Uncertain
T
PROVEAN
Benign
N;.
Sift
Benign
T;.
Sift4G
Benign
T;T
Polyphen
D;.
Vest4
MutPred
Loss of catalytic residue at K279 (P = 5e-04);Loss of catalytic residue at K279 (P = 5e-04);
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at