17-50077122-G-A

Variant names:

• chr17-50077122-G-A
• rs797045048
• NM_002204.4:c.2070+1G>A

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_002204.4(ITGA3):​c.2070+1G>A variant causes a splice donor, intron change. The variant allele was found at a frequency of 0.000000719 in 1,389,932 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: ITGA3 NM_002204.4 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 5.18
• Publications: 0 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: Pathogenic. The variant received 18 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-50077122-G-A is Pathogenic according to our data. Variant chr17-50077122-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 209163.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ITGA3	NM_002204.4	c.2070+1G>A		splice_donor_variant, intron_variant	Intron 15 of 25	ENST00000320031.13	NP_002195.1
ITGA3	XM_005257308.3	c.1665+1G>A		splice_donor_variant, intron_variant	Intron 13 of 23		XP_005257365.1
ITGA3	XM_047435922.1	c.2070+1G>A		splice_donor_variant, intron_variant	Intron 15 of 17		XP_047291878.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ITGA3	ENST00000320031.13	c.2070+1G>A		splice_donor_variant, intron_variant	Intron 15 of 25	1	NM_002204.4	ENSP00000315190.8

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.19e-7 AC: 1 AN: 1389932 Hom.: 0 Cov.: 32 AF XY: 0.00000146 AC XY: 1 AN XY: 682730

⚠️ 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: 31636

American (AMR) AF: 0.00 AC: 0 AN: 36082

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24482

East Asian (EAS) AF: 0.00 AC: 0 AN: 36312

South Asian (SAS) AF: 0.0000126 AC: 1 AN: 79588

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48552

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5614

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1070340

Other (OTH) AF: 0.00 AC: 0 AN: 57326

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000108 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Epidermolysis bullosa, junctional 7, with interstitial lung disease and nephrotic syndrome Pathogenic:2

Nov 04, 2014

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This splice site variant is categorized as deleterious according to ACMG guidelines (PMID:18414213) and was found once in our laboratory in trans with a missense variant [T658R] in a 20-year-old male with cleft lip, short stature, hypothyroidism, small right kidney, polycystic kidney disease, chronic renal insufficiency, abnormal findings on lung imaging, hyperlipidemia and skin anomalies (rash, lichen planus, discolored teeth) -

Jan 01, 2024

Daryl Scott Lab, Baylor College of Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PVS1, PM2 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.24
CADD	Pathogenic	34
DANN	Uncertain	0.99
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		5.2
GERP RS		5.3
PromoterAI		-0.088	Neutral
Mutation Taster		=2/98	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.93
SpliceAI score (max)		0.99		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.42		Position offset: -40
DS_DL_spliceai		0.99		Position offset: -1

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

Other links and lift over

dbSNP: rs797045048; hg19: chr17-48154486; COSMIC: COSV99144064; COSMIC: COSV99144064;