1-54999208-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1PM2PM5PP3_StrongPP5_Very_Strong

The NM_057176.3(BSND):c.22C>T(p.Arg8Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000248 in 1,614,140 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R8L) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000023 ( 0 hom. )

Consequence

BSND
NM_057176.3 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 3.17

Variant links:

Genes affected

BSND (HGNC:16512): (barttin CLCNK type accessory subunit beta) This gene encodes an essential beta subunit for CLC chloride channels. These heteromeric channels localize to basolateral membranes of renal tubules and of potassium-secreting epithelia of the inner ear. Mutations in this gene have been associated with Bartter syndrome with sensorineural deafness. [provided by RefSeq, Jul 2008]

BSND links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PM1

In a transmembrane_region Helical (size 20) in uniprot entity BSND_HUMAN there are 9 pathogenic changes around while only 1 benign (90%) in NM_057176.3

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-54999208-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 2910107.Status of the report is criteria_provided_single_submitter, 1 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.962

PP5

Variant 1-54999208-C-T is Pathogenic according to our data. Variant chr1-54999208-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 4381.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-54999208-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BSND	NM_057176.3 linkuse as main transcript	c.22C>T	p.Arg8Trp	missense_variant	1/4	ENST00000651561.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BSND	ENST00000651561.1 linkuse as main transcript	c.22C>T	p.Arg8Trp	missense_variant	1/4		NM_057176.3	P1

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000579

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251414

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135896

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

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:

0.0000226

AC:

AN:

1461838

Hom.:

Cov.:

AF XY:

0.0000179

AC XY:

AN XY:

727226

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000270

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152302

Hom.:

Cov.:

AF XY:

0.0000537

AC XY:

AN XY:

74470

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000580

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000554

Hom.:

Bravo

AF:

0.0000264

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Bartter syndrome

Pathogenic:2

Likely pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Nov 07, 2022	Variant summary: BSND c.22C>T (p.Arg8Trp) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 251414 control chromosomes. c.22C>T has been reported in the literature as a homozygous genotype in individuals with clinically diagnosed Bartter Syndrome, Type 4a (example:Birkenhger_2001 and Wang_2017 etc.). These data indicate that the variant is likely to be associated with disease. Several publications reports experimental evidence evaluating an impact on protein function demonstrating that this variant nearly abolishes CIS -K1 activation ans is not capable of switching human CIC-K channels to an active conformation (example: Janssen_2009 and Waldegger_2002 etc.) . Another variant at the same locus p.R8L has also been shown to have similar effect (Waldegger_2002) and multiple other variants affecting the same codon have been reported in association with Bartter syndrome (p.R8G, p.R8L). Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Bartter disease type 4A

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Nov 01, 2001

- -

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Invitae

Nov 10, 2023

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 8 of the BSND protein (p.Arg8Trp). This variant is present in population databases (rs74315285, gnomAD 0.06%). This missense change has been observed in individuals with Bartter syndrome with sensorineural deafness (PMID: 11687798, 29254190, 35709690). ClinVar contains an entry for this variant (Variation ID: 4381). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt BSND protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects BSND function (PMID: 18776122). This variant disrupts the p.Arg8 amino acid residue in BSND. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 29986705, 30174009). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.76

BayesDel_addAF

Pathogenic

0.44

BayesDel_noAF

Pathogenic

0.40

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Pathogenic

0.90

Eigen

Uncertain

0.60

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.89

M_CAP

Pathogenic

0.45

MetaRNN

Pathogenic

0.96

MetaSVM

Pathogenic

0.97

MutationAssessor

Benign

0.81

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.64

PROVEAN

Pathogenic

-7.5

REVEL

Pathogenic

0.92

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.89

MVP

0.98

MPC

0.45

ClinPred

1.0

GERP RS

4.4

Varity_R

0.84

gMVP

0.94

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

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