rs794726676

Variant names:

• chr17-75755758-TG-T
• rs794726676
• NM_000213.5:c.4620delG

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PP5_Moderate

The NM_000213.5(ITGB4):​c.4620delG​(p.Thr1542HisfsTer5) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000753 in 1,460,562 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: ITGB4 NM_000213.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.39
• Publications: 0 publications found

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]

GALK1 (HGNC:4118): (galactokinase 1) Galactokinase is a major enzyme for the metabolism of galactose and its deficiency causes congenital cataracts during infancy and presenile cataracts in the adult population. [provided by RefSeq, Jul 2008]

GALK1 Gene-Disease associations (from GenCC):

• galactokinase deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, G2P, Myriad Women’s Health, Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 17-75755758-TG-T is Pathogenic according to our data. Variant chr17-75755758-TG-T is described in ClinVar as Pathogenic. ClinVar VariationId is 14731.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000213.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ITGB4	NM_000213.5	MANE Select	c.4620delG	p.Thr1542HisfsTer5	frameshift	Exon 35 of 40	NP_000204.3
	ITGB4	NM_001005619.2		c.4569delG	p.Thr1525HisfsTer5	frameshift	Exon 35 of 40	NP_001005619.1
	ITGB4	NM_001005731.3		c.4410delG	p.Thr1472HisfsTer5	frameshift	Exon 34 of 39	NP_001005731.1	P16144-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ITGB4	ENST00000200181.8	TSL:1 MANE Select	c.4620delG	p.Thr1542HisfsTer5	frameshift	Exon 35 of 40	ENSP00000200181.3	P16144-1
	ITGB4	ENST00000449880.7	TSL:1	c.4569delG	p.Thr1525HisfsTer5	frameshift	Exon 35 of 40	ENSP00000400217.2	P16144-3
	ITGB4	ENST00000450894.7	TSL:1	c.4410delG	p.Thr1472HisfsTer5	frameshift	Exon 34 of 39	ENSP00000405536.3	P16144-2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000753 AC: 11 AN: 1460562 Hom.: 0 Cov.: 33 AF XY: 0.00000550 AC XY: 4 AN XY: 726644

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26124

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52216

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5752

European-Non Finnish (NFE) AF: 0.00000989 AC: 11 AN: 1111948

Other (OTH) AF: 0.00 AC: 0 AN: 60380

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Junctional epidermolysis bullosa with pyloric atresia (1)
1	-	-	Junctional epidermolysis bullosa with pyloric atresia;C5676956:Epidermolysis bullosa, junctional 5A, intermediate (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		3.4
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs794726676; hg19: chr17-73751839;