NM_057176.3:c.1A>T

Variant names:

• chr1-54999187-A-T
• rs74315284
• NM_057176.3:c.1A>T

Variant summary

Our verdict is Pathogenic. Variant got 20 ACMG points: 20P and 0B. PVS1 PS1_Moderate PM2 PP5_Very_Strong

The NM_057176.3(BSND):​c.1A>T​(p.Met1?) variant causes a initiator codon change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,720 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 Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: BSND NM_057176.3 initiator_codon
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 8.12

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]

ACMG classification

Verdict is Pathogenic. Variant got 20 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 16 pathogenic variants. Next in-frame start position is after 26 codons. Genomic position: 54999262. Lost 0.079 part of the original CDS.
• PS1: Another start lost variant in NM_057176.3 (BSND) was described as [Likely_pathogenic] in ClinVar as 4384
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-54999187-A-T is Pathogenic according to our data. Variant chr1-54999187-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 4380.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-54999187-A-T is described in Lovd as [Pathogenic]. Variant chr1-54999187-A-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BSND	NM_057176.3	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 4	ENST00000651561.1	NP_476517.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BSND	ENST00000651561.1	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 4		NM_057176.3	ENSP00000498282.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251270 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135846

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461720 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727170

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: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Sep 05, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 4380). This sequence change affects the initiator methionine of the BSND mRNA. The next in-frame methionine is located at codon 26. This variant is present in population databases (rs74315284, gnomAD 0.0009%). Disruption of the initiator codon has been observed in individuals with Bartter syndrome (PMID: 11687798, 16773427). This variant is also known as A1T. This variant disrupts a region of the BSND protein in which other variant(s) (p.Ile12Thr) have been determined to be pathogenic (PMID: 19646679, 21541222). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

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Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

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Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Bartter disease type 4A Pathogenic:2

Nov 01, 2001

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Jan 24, 2022

Institute of Human Genetics, University Hospital Muenster

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG categories: PVS1,PM2,PP5 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.43
CADD	Uncertain	25
DANN	Uncertain	0.98
DEOGEN2	Pathogenic	0.89	D
Eigen	Uncertain	0.51
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.89	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	0.94	D
PROVEAN	Uncertain	-2.7	D
REVEL	Pathogenic	0.87
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.80	P
Vest4		0.94
MutPred		1.0		Loss of methylation at K5 (P = 0.0878);
MVP		0.89
ClinPred		0.99	D
GERP RS		4.2
Varity_R		0.88
gMVP		0.62

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: rs74315284; hg19: chr1-55464860;