chr17-75727853-T-C

Position:

• chr17-75727853-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP3_Strong PP5

The NM_000213.5(ITGB4):​c.467T>C​(p.Leu156Pro) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,328 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 predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ITGB4 NM_000213.5 missense, splice_region
• Scores: Splicing: ADA: 0.002745
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 8.01

Genes affected

ITGB4 (HGNC:6158): (integrin subunit beta 4) Integrins are heterodimers comprised of alpha and beta subunits, that are noncovalently associated transmembrane glycoprotein receptors. Different combinations of alpha and beta polypeptides form complexes that vary in their ligand-binding specificities. Integrins mediate cell-matrix or cell-cell adhesion, and transduced signals that regulate gene expression and cell growth. This gene encodes the integrin beta 4 subunit, a receptor for the laminins. This subunit tends to associate with alpha 6 subunit and is likely to play a pivotal role in the biology of invasive carcinoma. Mutations in this gene are associated with epidermolysis bullosa with pyloric atresia. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a domain VWFA (size 198) in uniprot entity ITB4_HUMAN there are 5 pathogenic changes around while only 0 benign (100%) in NM_000213.5
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.986
• PP5: Variant 17-75727853-T-C is Pathogenic according to our data. Variant chr17-75727853-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 14732.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ITGB4	NM_000213.5	c.467T>C	p.Leu156Pro	missense_variant, splice_region_variant	5/40	ENST00000200181.8	NP_000204.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ITGB4	ENST00000200181.8	c.467T>C	p.Leu156Pro	missense_variant, splice_region_variant	5/40	1	NM_000213.5	ENSP00000200181

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461328 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 726972

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Junctional epidermolysis bullosa with pyloric atresia Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Apr 01, 1998

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	29
DANN	Benign	0.96
DEOGEN2	Pathogenic	0.95	.;D;.;.;.
Eigen	Pathogenic	0.86
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.88	.;D;D;D;D
M_CAP	Pathogenic	0.44	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.5	H;H;H;H;.
MutationTaster	Benign	1.0	A;A;A;A;A
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-6.5	.;D;D;D;.
REVEL	Pathogenic	0.99
Sift	Pathogenic	0.0	.;D;D;D;.
Sift4G	Pathogenic	0.0	D;D;D;D;D
Polyphen		1.0	.;D;.;D;.
Vest4		0.96
MutPred		0.94		Gain of disorder (P = 0.0205);Gain of disorder (P = 0.0205);Gain of disorder (P = 0.0205);Gain of disorder (P = 0.0205);.;
MVP		0.99
MPC		1.3
ClinPred		1.0	D
GERP RS		5.3
Varity_R		0.97
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0027
dbscSNV1_RF	Benign	0.028
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

Other links and lift over

dbSNP: rs121912461; hg19: chr17-73723934;