chr17-75751900-A-G

Position:

• chr17-75751900-A-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_000213.5(ITGB4):​c.3794-274A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00213 in 518,836 control chromosomes in the GnomAD database, including 10 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0050 (7 hom., cov: 33)
  • Exomes 𝑓: 0.00095 (3 hom.)
• Consequence: ITGB4 NM_000213.5 intron
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 0.0260

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).
• BP6: Variant 17-75751900-A-G is Benign according to our data. Variant chr17-75751900-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 1215254.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00495 (754/152290) while in subpopulation AFR AF= 0.0166 (690/41562). AF 95% confidence interval is 0.0156. There are 7 homozygotes in gnomad4. There are 349 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 7 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ITGB4	NM_000213.5	c.3794-274A>G		intron_variant		ENST00000200181.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ITGB4	ENST00000200181.8	c.3794-274A>G		intron_variant		1	NM_000213.5

Frequencies

GnomAD3 genomes AF: 0.00496 AC: 755 AN: 152172 Hom.: 7 Cov.: 33

Gnomad AFR AF: 0.0167

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00131

Gnomad ASJ AF: 0.00548

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000250

Gnomad OTH AF: 0.00382

GnomAD4 exome AF: 0.000952 AC: 349 AN: 366546 Hom.: 3 AF XY: 0.000866 AC XY: 169 AN XY: 195238

Gnomad4 AFR exome AF: 0.0170

Gnomad4 AMR exome AF: 0.00112

Gnomad4 ASJ exome AF: 0.00560

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000653

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000204

Gnomad4 OTH exome AF: 0.00173

GnomAD4 genome AF: 0.00495 AC: 754 AN: 152290 Hom.: 7 Cov.: 33 AF XY: 0.00469 AC XY: 349 AN XY: 74470

Gnomad4 AFR AF: 0.0166

Gnomad4 AMR AF: 0.00131

Gnomad4 ASJ AF: 0.00548

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000250

Gnomad4 OTH AF: 0.00378

Alfa AF: 0.00402 Hom.: 0

Bravo AF: 0.00552

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 19, 2018	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	0.98
DANN	Benign	0.35

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

Other links and lift over

dbSNP: rs144072734; hg19: chr17-73747981;