16-56865288-G-GGC

Position:

chr16-56865288-G-GGC

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_001126108.2(SLC12A3):c.56_57dup(p.Phe20AlafsTer8) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000248 in 1,613,834 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. G18G) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

SLC12A3
NM_001126108.2 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 1.05

Variant links:

Genes affected

SLC12A3 (HGNC:10912): (solute carrier family 12 member 3) This gene encodes a renal thiazide-sensitive sodium-chloride cotransporter that is important for electrolyte homeostasis. This cotransporter mediates sodium and chloride reabsorption in the distal convoluted tubule. Mutations in this gene cause Gitelman syndrome, a disease similar to Bartter's syndrome, that is characterized by hypokalemic alkalosis combined with hypomagnesemia, low urinary calcium, and increased renin activity associated with normal blood pressure. This cotransporter is the target for thiazide diuretics that are used for treating high blood pressure. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

SLC12A3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 345 pathogenic variants in the truncated region.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 16-56865288-G-GGC is Pathogenic according to our data. Variant chr16-56865288-G-GGC is described in ClinVar as [Likely_pathogenic]. Clinvar id is 851316.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
SLC12A3	NM_001126108.2 linkuse as main transcript	c.56_57dup	p.Phe20AlafsTer8	frameshift_variant	1/26	ENST00000563236.6
SLC12A3	NM_000339.3 linkuse as main transcript	c.56_57dup	p.Phe20AlafsTer8	frameshift_variant	1/26
SLC12A3	NM_001126107.2 linkuse as main transcript	c.56_57dup	p.Phe20AlafsTer8	frameshift_variant	1/26
SLC12A3	NM_001410896.1 linkuse as main transcript	c.56_57dup	p.Phe20AlafsTer8	frameshift_variant	1/26

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC12A3	ENST00000563236.6 linkuse as main transcript	c.56_57dup	p.Phe20AlafsTer8	frameshift_variant	1/26	1	NM_001126108.2	A1	P55017-1
SLC12A3	ENST00000438926.6 linkuse as main transcript	c.56_57dup	p.Phe20AlafsTer8	frameshift_variant	1/26	1		A1	P55017-2
SLC12A3	ENST00000566786.5 linkuse as main transcript	c.56_57dup	p.Phe20AlafsTer8	frameshift_variant	1/26	1		P4	P55017-3
SLC12A3	ENST00000262502.5 linkuse as main transcript	c.56_57dup	p.Phe20AlafsTer8	frameshift_variant	1/26	5		A1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250908

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135730

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461620

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727128

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

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:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152214

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000302

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Familial hypokalemia-hypomagnesemia

Pathogenic:2

Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 01, 2021	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	New York Genome Center	Jun 05, 2020	- -

Inborn genetic diseases

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

May 17, 2024

The c.56_57dupGC (p.F20Afs*8) alteration, located in exon 1 (coding exon 1) of the SLC12A3 gene, consists of a duplication of GC at position 56, causing a translational frameshift with a predicted alternate stop codon after 8 amino acids. The predicted stop codon occurs in the 5' end of the SLC12A3 gene. Premature termination codons in the 5’ end of a gene have been reported to escape nonsense-mediated mRNA decay and/or lead to re-initiation (Rivas, 2015; Lindeboom, 2016; Rhee, 2017). Direct evidence for this alteration is unavailable; however, premature termination codons are typically deleterious in nature. Based on data from gnomAD, the GCGC allele has an overall frequency of 0.001% (2/282296) total alleles studied. The highest observed frequency was 0.014% (1/7216) of Other alleles. This variant has been reported homozygous and in conjunction with another SLC12A3 variant in individuals genetically diagnosed with Gitelman syndrome; however, clinical details were limited (Blanchard, 2015; Alexandru, 2020). Based on the available evidence, this alteration is classified as likely pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 04, 2023

This sequence change creates a premature translational stop signal (p.Phe20Alafs*8) in the SLC12A3 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SLC12A3 are known to be pathogenic (PMID: 20848653, 22009145, 25841442). This variant is present in population databases (rs758683818, gnomAD 0.003%). This premature translational stop signal has been observed in individual(s) with clinical features of Gitelman syndrome (PMID: 31285285). ClinVar contains an entry for this variant (Variation ID: 851316). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over