13-20138815-G-A

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_021954.4(GJA3):c.*3166C>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 0.0219 in 152,190 control chromosomes in the GnomAD database, including 101 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.022 (101 hom., cov: 32)
  • Failed GnomAD Quality Control
• Consequence: GJA3 NM_021954.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -1.25

Genes affected

GJA3 (HGNC:4277): (gap junction protein alpha 3) The protein encoded by this gene is a connexin and is a component of lens fiber gap junctions. Defects in this gene are a cause of zonular pulverulent cataract type 3 (CZP3). [provided by RefSeq, Jan 2010]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 13-20138815-G-A is Benign according to our data. Variant chr13-20138815-G-A is described in ClinVar as [Benign]. Clinvar id is 311287.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0617 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GJA3	NM_021954.4	c.*3166C>T		3_prime_UTR_variant	2/2	ENST00000241125.4
GJA3	XM_011535048.3	c.*3166C>T		3_prime_UTR_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GJA3	ENST00000241125.4	c.*3166C>T		3_prime_UTR_variant	2/2	3	NM_021954.4	P1

Frequencies

GnomAD3 genomes AF: 0.0219 AC: 3324 AN: 152072 Hom.: 101 Cov.: 32

Gnomad AFR AF: 0.0635

Gnomad AMI AF: 0.0879

Gnomad AMR AF: 0.0171

Gnomad ASJ AF: 0.0239

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.000189

Gnomad MID AF: 0.0570

Gnomad NFE AF: 0.00271

Gnomad OTH AF: 0.0306

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

GnomAD4 genome AF: 0.0219 AC: 3338 AN: 152190 Hom.: 101 Cov.: 32 AF XY: 0.0208 AC XY: 1549 AN XY: 74422

Gnomad4 AFR AF: 0.0637

Gnomad4 AMR AF: 0.0171

Gnomad4 ASJ AF: 0.0239

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.000189

Gnomad4 NFE AF: 0.00269

Gnomad4 OTH AF: 0.0303

Alfa AF: 0.0111 Hom.: 5

Bravo AF: 0.0264

Asia WGS AF: 0.00664 AC: 23 AN: 3476

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cataract 14 multiple types Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
Cadd	Benign	0.52
Dann	Benign	0.37

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: rs74035923; hg19: chr13-20712954;