12-53191947-A-G

Position:

• chr12-53191947-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000889.3(ITGB7):​c.2228T>C​(p.Val743Ala) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,459,416 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ITGB7 NM_000889.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.14

Genes affected

ITGB7 (HGNC:6162): (integrin subunit beta 7) This gene encodes a protein that is a member of the integrin superfamily. Members of this family are adhesion receptors that function in signaling from the extracellular matrix to the cell. Integrins are heterodimeric integral membrane proteins composed of an alpha chain and a beta chain. The encoded protein forms dimers with an alpha4 chain or an alphaE chain and plays a role in leukocyte adhesion. Dimerization with alpha4 forms a homing receptor for migration of lymphocytes to the intestinal mucosa and Peyer's patches. Dimerization with alphaE permits binding to the ligand epithelial cadherin, a calcium-dependent adhesion molecule. Alternate splicing results in multiple transcript variants. Additional alternatively spliced transcript variants of this gene have been described, but their full-length nature is not known. [provided by RefSeq, Sep 2013]

ZNF740 (HGNC:27465): (zinc finger protein 740) Enables sequence-specific double-stranded DNA binding activity. Predicted to be involved in regulation of transcription by RNA polymerase II. Predicted to be located in nucleus. Predicted to be part of chromatin. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ITGB7	NM_000889.3	c.2228T>C	p.Val743Ala	missense_variant	15/16	ENST00000267082.10
ZNF740	NM_001004304.4	c.*4357A>G		3_prime_UTR_variant	7/7	ENST00000416904.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ITGB7	ENST00000267082.10	c.2228T>C	p.Val743Ala	missense_variant	15/16	1	NM_000889.3	P1
ZNF740	ENST00000416904.5	c.*4357A>G		3_prime_UTR_variant	7/7	1	NM_001004304.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459416 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726058

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: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 01, 2023

The c.2228T>C (p.V743A) alteration is located in exon 15 (coding exon 13) of the ITGB7 gene. This alteration results from a T to C substitution at nucleotide position 2228, causing the valine (V) at amino acid position 743 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.14
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.48	T;T;.
Eigen	Benign	0.15
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Uncertain	0.96	D
M_CAP	Pathogenic	0.34	D
MetaRNN	Uncertain	0.50	D;D;D
MetaSVM	Uncertain	-0.13	T
MutationAssessor	Benign	0.76	N;N;.
MutationTaster	Benign	0.98	D;D;N;N
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-2.3	N;N;.
REVEL	Uncertain	0.63
Sift	Uncertain	0.0010	D;D;.
Sift4G	Uncertain	0.0030	D;D;D
Polyphen		0.30	B;B;.
Vest4		0.56
MutPred		0.50		Loss of stability (P = 0.1016);Loss of stability (P = 0.1016);.;
MVP		0.91
MPC		0.91
ClinPred		0.77	D
GERP RS		3.7
Varity_R		0.20
gMVP		0.58

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1941967720; hg19: chr12-53585731;