17-44372401-C-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM1BP4_ModerateBS1_Supporting

The NM_000419.5(ITGA2B):c.3083G>A(p.Arg1028Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000403 in 1,613,952 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000036 ( 0 hom. )

Consequence

ITGA2B
NM_000419.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.65

Variant links:

Genes affected

ITGA2B (HGNC:6138): (integrin subunit alpha 2b) This gene encodes a member of the integrin alpha chain family of proteins. The encoded preproprotein is proteolytically processed to generate light and heavy chains that associate through disulfide linkages to form a subunit of the alpha-IIb/beta-3 integrin cell adhesion receptor. This receptor plays a crucial role in the blood coagulation system, by mediating platelet aggregation. Mutations in this gene are associated with platelet-type bleeding disorders, which are characterized by a failure of platelet aggregation, including Glanzmann thrombasthenia. [provided by RefSeq, Jan 2016]

ITGA2B links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PM1

In a chain Integrin alpha-IIb light chain, form 1 (size 148) in uniprot entity ITA2B_HUMAN there are 7 pathogenic changes around while only 2 benign (78%) in NM_000419.5

BP4

Computational evidence support a benign effect (MetaRNN=0.22474512).

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.0000789 (12/152094) while in subpopulation SAS AF= 0.00166 (8/4820). AF 95% confidence interval is 0.000825. There are 0 homozygotes in gnomad4. There are 10 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
ITGA2B	NM_000419.5 linkuse as main transcript	c.3083G>A	p.Arg1028Gln	missense_variant	30/30	ENST00000262407.6
ITGA2B	XM_011524749.2 linkuse as main transcript	c.3134G>A	p.Arg1045Gln	missense_variant	29/29
ITGA2B	XM_011524750.2 linkuse as main transcript	c.3119G>A	p.Arg1040Gln	missense_variant	29/29

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ITGA2B	ENST00000262407.6 linkuse as main transcript	c.3083G>A	p.Arg1028Gln	missense_variant	30/30	1	NM_000419.5	P1	P08514-1
ITGA2B	ENST00000648408.1 linkuse as main transcript	c.2399G>A	p.Arg800Gln	missense_variant	25/25
ITGA2B	ENST00000587295.5 linkuse as main transcript	c.278G>A	p.Arg93Gln	missense_variant	3/3	3

Frequencies

GnomAD3 genomes

AF:

0.0000790

AC:

AN:

151976

Hom.:

Cov.:

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:

0.00166

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000955

AC:

AN:

251306

Hom.:

AF XY:

0.000162

AC XY:

AN XY:

135880

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:

0.000751

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000363

AC:

AN:

1461858

Hom.:

Cov.:

AF XY:

0.0000591

AC XY:

AN XY:

727228

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:

0.000533

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000789

AC:

AN:

152094

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74334

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:

0.00166

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000108

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.000115

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Glanzmann thrombasthenia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 20, 2022

This variant has not been reported in the literature in individuals affected with ITGA2B-related conditions. 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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant is present in population databases (rs773819905, gnomAD 0.08%). This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 1028 of the ITGA2B protein (p.Arg1028Gln). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.21

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.28

Cadd

Uncertain

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.68

Eigen

Uncertain

0.32

Eigen_PC

Uncertain

0.23

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.78

M_CAP

Uncertain

0.23

MetaRNN

Benign

0.22

MetaSVM

Uncertain

0.54

MutationAssessor

Benign

1.7

MutationTaster

Benign

0.99

D;D

PrimateAI

Benign

0.33

PROVEAN

Uncertain

-2.5

REVEL

Uncertain

0.61

Sift

Uncertain

0.0040

Sift4G

Uncertain

0.037

Polyphen

1.0

Vest4

0.31

MutPred

0.56

Loss of glycosylation at P1029 (P = 0.1149);

MVP

0.79

MPC

0.76

ClinPred

0.57

GERP RS

3.5

Varity_R

0.69

gMVP

0.65

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over