17-44377772-A-G

Position:

chr17-44377772-A-G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_000419.5(ITGA2B):c.2113T>C(p.Cys705Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000031 in 1,613,360 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 Pathogenic (★★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 30)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

ITGA2B
NM_000419.5 missense

Scores

Clinical Significance

Pathogenic reviewed by expert panel P:2

Conservation

PhyloP100: 7.06

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 Pathogenic. Variant got 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.993

PP5

Variant 17-44377772-A-G is Pathogenic according to our data. Variant chr17-44377772-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 953058.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
ITGA2B	NM_000419.5 linkuse as main transcript	c.2113T>C	p.Cys705Arg	missense_variant	21/30	ENST00000262407.6	NP_000410.2
ITGA2B	XM_011524749.2 linkuse as main transcript	c.2266T>C	p.Cys756Arg	missense_variant	21/29		XP_011523051.2
ITGA2B	XM_011524750.2 linkuse as main transcript	c.2266T>C	p.Cys756Arg	missense_variant	21/29		XP_011523052.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ITGA2B	ENST00000262407.6 linkuse as main transcript	c.2113T>C	p.Cys705Arg	missense_variant	21/30	1	NM_000419.5	ENSP00000262407	P1	P08514-1
ITGA2B	ENST00000648408.1 linkuse as main transcript	c.1546T>C	p.Cys516Arg	missense_variant	17/25			ENSP00000498119
ITGA2B	ENST00000592462.5 linkuse as main transcript	n.908T>C		non_coding_transcript_exon_variant	10/15	5

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152108

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:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251428

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135894

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:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461252

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

726936

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:

0.00000360

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152108

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74286

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

Bravo

AF:

0.00000756

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Glanzmann thrombasthenia

Pathogenic:1

Pathogenic, reviewed by expert panel

curation

ClinGen Platelet Disorders Variant Curation Expert Panel, ClinGen

Sep 06, 2020

The c.2113T>C (p.Cys705Arg) variant has been reported in at least 7 probands (3 homozygotes and 4 compound heterozygotes; PMIDs: 20020534, 12424194, 12083483, 25728920, 25539746, 9920835); at least two with a phenotype highly specific to GT (PMIDs: 9920835, 25539746). The variant cosegregated with disease in one of these probands and two additional relatives (PMID: 12424194). The variant is found at an extremely low frequency, with an the overall allele frequency on gnomAD is 0.000003977 (1/113,742 alleles in the non-Finnish European population). Multiple lines of computational evidence support a deleterious effect on the gene/gene product (REVEL score of 0.878). Expression in CHO cells was strongly attenuated, shown by immunoprecipitation and flow cytometry (~70% reduction), in cells coexpressing normal GPIIIa with the mutant GPIIb. In summary, this variant meets criteria to be classified as Pathogenic for GT. GT-specific criteria applied: PM2_Supporting, PM3_Strong, PP1_Moderate, PP3, and PP4_Strong. -

Glanzmann thrombasthenia 1

Pathogenic:1

Pathogenic, no assertion criteria provided

research

ISTH-SSC Genomics in Thrombosis and Hemostasis, KU Leuven, Center for Molecular and Vascular Biology

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.45

BayesDel_noAF

Pathogenic

0.41

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.45

Eigen

Pathogenic

0.87

Eigen_PC

Pathogenic

0.81

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.71

M_CAP

Pathogenic

0.47

MetaRNN

Pathogenic

0.99

MetaSVM

Uncertain

0.69

MutationAssessor

Pathogenic

3.5

MutationTaster

Benign

1.0

A;A

PrimateAI

Uncertain

0.73

PROVEAN

Pathogenic

-11

REVEL

Pathogenic

0.88

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.98

MutPred

0.94

Gain of MoRF binding (P = 0.0014);

MVP

0.91

MPC

1.3

ClinPred

1.0

GERP RS

5.6

Varity_R

0.99

gMVP

0.92

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