13-20187970-G-A

Position:

• chr13-20187970-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_004004.6(GJB2):​c.*931C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0398 in 152,212 control chromosomes in the GnomAD database, including 171 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.040 (171 hom., cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: GJB2 NM_004004.6 3_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 0.883

Genes affected

GJB2 (HGNC:4284): (gap junction protein beta 2) This gene encodes a member of the gap junction protein family. The gap junctions were first characterized by electron microscopy as regionally specialized structures on plasma membranes of contacting adherent cells. These structures were shown to consist of cell-to-cell channels that facilitate the transfer of ions and small molecules between cells. The gap junction proteins, also known as connexins, purified from fractions of enriched gap junctions from different tissues differ. According to sequence similarities at the nucleotide and amino acid levels, the gap junction proteins are divided into two categories, alpha and beta. Mutations in this gene are responsible for as much as 50% of pre-lingual, recessive deafness. [provided by RefSeq, Oct 2008]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BP6: Variant 13-20187970-G-A is Benign according to our data. Variant chr13-20187970-G-A is described in ClinVar as [Benign]. Clinvar id is 311361.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.0588 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GJB2	NM_004004.6	c.*931C>T		3_prime_UTR_variant	2/2	ENST00000382848.5	NP_003995.2
GJB2	XM_011535049.3	c.*931C>T		3_prime_UTR_variant	2/2		XP_011533351.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GJB2	ENST00000382848	c.*931C>T		3_prime_UTR_variant	2/2	1	NM_004004.6	ENSP00000372299.4
GJB2	ENST00000382844	c.*931C>T		3_prime_UTR_variant	1/1			ENSP00000372295.1

Frequencies

GnomAD3 genomes AF: 0.0399 AC: 6061 AN: 152094 Hom.: 171 Cov.: 33

Gnomad AFR AF: 0.0106

Gnomad AMI AF: 0.00441

Gnomad AMR AF: 0.0464

Gnomad ASJ AF: 0.0352

Gnomad EAS AF: 0.00519

Gnomad SAS AF: 0.0251

Gnomad FIN AF: 0.0388

Gnomad MID AF: 0.0573

Gnomad NFE AF: 0.0604

Gnomad OTH AF: 0.0498

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 2 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

Gnomad4 AFR exome AF: 0.00

GnomAD4 genome AF: 0.0398 AC: 6061 AN: 152212 Hom.: 171 Cov.: 33 AF XY: 0.0384 AC XY: 2857 AN XY: 74414

Gnomad4 AFR AF: 0.0106

Gnomad4 AMR AF: 0.0463

Gnomad4 ASJ AF: 0.0352

Gnomad4 EAS AF: 0.00521

Gnomad4 SAS AF: 0.0251

Gnomad4 FIN AF: 0.0388

Gnomad4 NFE AF: 0.0604

Gnomad4 OTH AF: 0.0498

Alfa AF: 0.0496 Hom.: 44

Bravo AF: 0.0388

Asia WGS AF: 0.0140 AC: 50 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	May 13, 2021	- -

Ichthyosis, hystrix-like, with hearing loss Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Autosomal recessive nonsyndromic hearing loss 1A Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Autosomal dominant nonsyndromic hearing loss 3A Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	7.0
DANN	Benign	0.47

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: rs5030700; hg19: chr13-20762109;