rs56017519

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1PM2PP3

The NM_000441.2(SLC26A4):c.1730T>C(p.Val577Ala) variant causes a missense change. The variant allele was found at a frequency of 0.00000435 in 1,607,936 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

SLC26A4
NM_000441.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 6.17

Variant links:

Genes affected

SLC26A4 (HGNC:8818): (solute carrier family 26 member 4) Mutations in this gene are associated with Pendred syndrome, the most common form of syndromic deafness, an autosomal-recessive disease. It is highly homologous to the SLC26A3 gene; they have similar genomic structures and this gene is located 3' of the SLC26A3 gene. The encoded protein has homology to sulfate transporters. [provided by RefSeq, Jul 2008]

SLC26A4 links:

SLC26A4 (HGNC:):

SLC26A4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM1

In a domain STAS (size 194) in uniprot entity S26A4_HUMAN there are 17 pathogenic changes around while only 4 benign (81%) in NM_000441.2

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.833

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC26A4	NM_000441.2 linkuse as main transcript	c.1730T>C	p.Val577Ala	missense_variant	16/21	ENST00000644269.2	NP_000432.1	O43511-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
SLC26A4	ENST00000644269.2 linkuse as main transcript	c.1730T>C	p.Val577Ala	missense_variant	16/21		NM_000441.2	ENSP00000494017.1	O43511-1
SLC26A4	ENST00000480841.5 linkuse as main transcript	n.579T>C		non_coding_transcript_exon_variant	7/8	3
SLC26A4	ENST00000644846.1 linkuse as main transcript	n.440T>C		non_coding_transcript_exon_variant	6/10			ENSP00000494344.1	A0A2R8Y4W7
SLC26A4	ENST00000492030.2 linkuse as main transcript	n.91-704T>C		intron_variant		5

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152056

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251110

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135692

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000412

AC:

AN:

1455880

Hom.:

Cov.:

AF XY:

0.00000276

AC XY:

AN XY:

724738

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000452

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152056

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74252

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Dec 13, 2023

Variant summary: SLC26A4 c.1730T>C (p.Val577Ala) results in a non-conservative amino acid change located in the STAS domain of the encoded protein sequence. Four of four 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 251110 control chromosomes. c.1730T>C has been reported in the literature in individuals affected with suspected Pendred Syndrome and hearing loss (Tesolin_2021, Roesch_2018, Likar_2018). These reports do not provide unequivocal conclusions about association of the variant with Pendred Syndrome. A functional study with variant-transfected cells showed severe loss in ion transport function, complete retention in the ER and dramatic reduction of expression (Roesch_2018). The following publications have been ascertained in the context of this evaluation (PMID: 29293505, 29320412, 34680964). Three submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Pendred syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Sep 05, 2021

- -

Autosomal recessive nonsyndromic hearing loss 4

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Sep 05, 2021

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jan 22, 2015

- -

Hearing impairment

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Mar 27, 2015

- -

SLC26A4-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Aug 01, 2024

The SLC26A4 c.1730T>C variant is predicted to result in the amino acid substitution p.Val577Ala. This variant was reported alone or together with additional one or two variants in SLC26A4 in individuals with non-syndromic hearing loss (Table 2,3, Likar et al. 2018. PubMed ID: 29293505; Roesch et al. 2018. PubMed ID: 29320412; Tesolin et al. 2021. PubMed ID: 34680964). In vitro functional studies show significant protein function reduction compared to wild type (76% reduction) (Table 3, Roesch et al. 2018. PubMed ID: 29320412). This variant is reported in 0.00088% of alleles in individuals of European (Non-Finnish) descent in gnomAD. Although we suspect that this variant is pathogenic, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Pathogenic

0.35

BayesDel_noAF

Pathogenic

0.26

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.51

D;D

Eigen

Pathogenic

0.79

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.80

.;T

M_CAP

Uncertain

0.21

MetaRNN

Pathogenic

0.83

D;D

MetaSVM

Uncertain

0.76

MutationAssessor

Uncertain

2.1

M;M

PrimateAI

Uncertain

0.75

PROVEAN

Uncertain

-3.5

D;.

REVEL

Pathogenic

0.81

Sift

Uncertain

0.0030

D;.

Sift4G

Uncertain

0.012

D;.

Polyphen

1.0

D;D

Vest4

0.84

MutPred

0.50

Loss of stability (P = 0.0516);Loss of stability (P = 0.0516);

MVP

0.97

MPC

0.075

ClinPred

0.97

GERP RS

5.7

Varity_R

0.80

gMVP

0.76

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