17-50077024-C-T

Variant names:

• chr17-50077024-C-T
• rs540704248
• NM_002204.4:c.1973C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PM5 PP3_Moderate

The NM_002204.4(ITGA3):​c.1973C>T​(p.Thr658Met) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,459,268 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T658R) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: ITGA3 NM_002204.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.70
• Publications: 1 publications found

Genes affected

ITGA3 (HGNC:6139): (integrin subunit alpha 3) The gene encodes a member of the integrin alpha chain family of proteins. Integrins are heterodimeric integral membrane proteins composed of an alpha chain and a beta chain that function as cell surface adhesion molecules. The encoded preproprotein is proteolytically processed to generate light and heavy chains that comprise the alpha 3 subunit. This subunit joins with a beta 1 subunit to form an integrin that interacts with extracellular matrix proteins including members of the laminin family. Expression of this gene may be correlated with breast cancer metastasis. [provided by RefSeq, Oct 2015]

ITGA3 Gene-Disease associations (from GenCC):

• epidermolysis bullosa, junctional 7, with interstitial lung disease and nephrotic syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, ClinGen, Ambry Genetics, Orphanet, G2P

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-50077024-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 209162.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.9

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002204.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ITGA3	NM_002204.4	MANE Select	c.1973C>T	p.Thr658Met	missense	Exon 15 of 26	NP_002195.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ITGA3	ENST00000320031.13	TSL:1 MANE Select	c.1973C>T	p.Thr658Met	missense	Exon 15 of 26	ENSP00000315190.8
	ITGA3	ENST00000007722.11	TSL:5	c.1973C>T	p.Thr658Met	missense	Exon 15 of 25	ENSP00000007722.7
	ITGA3	ENST00000506827.1	TSL:3	c.107C>T	p.Thr36Met	missense	Exon 2 of 7	ENSP00000426142.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000817 AC: 2 AN: 244760 AF XY: 0.0000150

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000915

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1459268 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 725594

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33454

American (AMR) AF: 0.00 AC: 0 AN: 44588

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26068

East Asian (EAS) AF: 0.00 AC: 0 AN: 39644

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86042

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52730

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1110702

Other (OTH) AF: 0.0000166 AC: 1 AN: 60280

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.00793067), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.35	T
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.89	D
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Benign	-0.39	T
MutationAssessor	Pathogenic	3.0	M
PhyloP100		3.7
PrimateAI	Uncertain	0.61	T
PROVEAN	Uncertain	-3.5	D
REVEL	Uncertain	0.39
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.75
MutPred		0.77		Gain of MoRF binding (P = 0.0792)
MVP		0.76
MPC		1.2
ClinPred		0.99	D
GERP RS		5.4
PromoterAI		-0.072	Neutral
Varity_R		0.53
gMVP		0.81
Mutation Taster		=48/52	disease causing

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

Other links and lift over

dbSNP: rs540704248; hg19: chr17-48154388;