rs397516431

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP3_Moderate

The NM_000441.2(SLC26A4):ā€‹c.697G>Cā€‹(p.Val233Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000421 in 1,613,880 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: š‘“ 0.000039 ( 0 hom., cov: 30)
Exomes š‘“: 0.000042 ( 0 hom. )

Consequence

SLC26A4
NM_000441.2 missense

Scores

6
11
2

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:8

Conservation

PhyloP100: 7.25
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]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM1
In a transmembrane_region Helical (size 20) in uniprot entity S26A4_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000441.2
PM2
Very rare variant in population databases, with high coverage;
PP3
MetaRNN computational evidence supports a deleterious effect, 0.885

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
SLC26A4NM_000441.2 linkuse as main transcriptc.697G>C p.Val233Leu missense_variant 6/21 ENST00000644269.2 NP_000432.1

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
SLC26A4ENST00000644269.2 linkuse as main transcriptc.697G>C p.Val233Leu missense_variant 6/21 NM_000441.2 ENSP00000494017 P1O43511-1

Frequencies

GnomAD3 genomes
AF:
0.0000395
AC:
6
AN:
152086
Hom.:
0
Cov.:
30
show subpopulations
Gnomad AFR
AF:
0.00
Gnomad AMI
AF:
0.00
Gnomad AMR
AF:
0.0000655
Gnomad ASJ
AF:
0.00
Gnomad EAS
AF:
0.000962
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:
0.000103
AC:
26
AN:
251476
Hom.:
0
AF XY:
0.0000956
AC XY:
13
AN XY:
135916
show subpopulations
Gnomad AFR exome
AF:
0.00
Gnomad AMR exome
AF:
0.00
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.00141
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:
0.0000424
AC:
62
AN:
1461794
Hom.:
0
Cov.:
31
AF XY:
0.0000358
AC XY:
26
AN XY:
727206
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.0000224
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00141
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.00
Gnomad4 OTH exome
AF:
0.0000828
GnomAD4 genome
AF:
0.0000395
AC:
6
AN:
152086
Hom.:
0
Cov.:
30
AF XY:
0.0000404
AC XY:
3
AN XY:
74298
show subpopulations
Gnomad4 AFR
AF:
0.00
Gnomad4 AMR
AF:
0.0000655
Gnomad4 ASJ
AF:
0.00
Gnomad4 EAS
AF:
0.000962
Gnomad4 SAS
AF:
0.00
Gnomad4 FIN
AF:
0.00
Gnomad4 NFE
AF:
0.00
Gnomad4 OTH
AF:
0.00
Bravo
AF:
0.0000491
ExAC
AF:
0.0000247
AC:
3
Asia WGS
AF:
0.000289
AC:
1
AN:
3478

ClinVar

Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:2Uncertain:8
Revision: criteria provided, conflicting classifications
LINK: link

Submissions by phenotype

not provided Pathogenic:1Uncertain:2
Uncertain significance, criteria provided, single submitterclinical testingGeneDxMar 08, 2024In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 28215547, 35640668, 33159754, 34170635, 30245029, 33199029, 28576516, 34752165, 30235673, 37017887, 17443271, 33907123, 30579095, 29605365, 31581539, 32459320, 26886089) -
Likely pathogenic, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpJan 21, 2024This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 233 of the SLC26A4 protein (p.Val233Leu). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individual(s) with congenital hypothyroidism and/or deafness (PMID: 17443271, 25788563, 26886089, 28215547, 32459320, 34170635). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 43564). 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 SLC26A4 protein function with a positive predictive value of 80%. 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. -
Uncertain significance, criteria provided, single submitterclinical testingRevvity Omics, RevvityDec 10, 2020- -
Pendred syndrome Uncertain:3
Uncertain significance, no assertion criteria providedclinical testingNatera, Inc.Sep 16, 2020- -
Uncertain significance, criteria provided, single submitterclinical testingCounsylNov 14, 2017- -
Uncertain significance, criteria provided, single submitterclinical testingGenome-Nilou LabSep 05, 2021- -
Autosomal recessive nonsyndromic hearing loss 4 Pathogenic:1Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingGenome-Nilou LabSep 05, 2021- -
Likely pathogenic, no assertion criteria providedresearchPrecision Medicine Center, Zhengzhou University-- -
not specified Uncertain:2
Uncertain significance, criteria provided, single submitterclinical testingLaboratory for Molecular Medicine, Mass General Brigham Personalized MedicineMar 08, 2011Variant classified as Uncertain Significance - Favor Pathogenic. The Val233Leu v ariant in SLC26A4 has been reported as a compound heterozygous variant with anot her pathogenic variant in a Chinese proband with hearing loss and enlarged vesti bular aqueduct (EVA) and was absent in 200 race matched control chromosomes (Hu, 2007). However, it was not reported whether this variant was in trans with the second SLC26A4 variant. Furthermore, computational analyses (biochemical amino a cid properties, homology, PolyPhen, SIFT, AlignGVGD) do not provide strong suppo rt for or against pathogenicity. In summary, the clinical significance of this v ariant cannot be determined with certainty at this time. -
Uncertain significance, criteria provided, single submitterclinical testingWomen's Health and Genetics/Laboratory Corporation of America, LabCorpApr 03, 2023Variant summary: SLC26A4 c.697G>C (p.Val233Leu) results in a conservative amino acid change located in the SLC26A/SulP transporter domain (IPR011547) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0001 in 251476 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in SLC26A4 causing Pendred Syndrome (0.0001 vs 0.0035), allowing no conclusion about variant significance. c.697G>C has been reported in the literature as a compound heterozygous genotype in individuals affected with enlarged vestibular aqueduct (EVA) (example, Hu_2007, Tian_2021) as well as a non-informative genotype in settings of multigene panel testing for hearing loss, congenital hypothyroidism (CH) (example, Nishio_2015, Fan_2017, Chen_2022, Yamaguchi_2020). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation (VUS, n=4; Likely pathogenic, n=1). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
0.40
BayesDel_addAF
Uncertain
0.093
D
BayesDel_noAF
Pathogenic
0.33
CADD
Pathogenic
27
DANN
Uncertain
1.0
DEOGEN2
Uncertain
0.65
D;D
Eigen
Uncertain
0.60
Eigen_PC
Uncertain
0.63
FATHMM_MKL
Pathogenic
0.98
D
LIST_S2
Pathogenic
0.98
.;D
M_CAP
Pathogenic
0.36
D
MetaRNN
Pathogenic
0.89
D;D
MetaSVM
Uncertain
0.52
D
MutationAssessor
Benign
1.5
L;L
MutationTaster
Benign
1.0
D
PrimateAI
Uncertain
0.71
T
PROVEAN
Uncertain
-2.5
D;.
REVEL
Pathogenic
0.78
Sift
Uncertain
0.0080
D;.
Sift4G
Uncertain
0.0090
D;.
Polyphen
0.99
D;D
Vest4
0.93
MutPred
0.89
Loss of catalytic residue at Q235 (P = 0.1485);Loss of catalytic residue at Q235 (P = 0.1485);
MVP
0.97
MPC
0.061
ClinPred
0.26
T
GERP RS
5.4
Varity_R
0.76
gMVP
0.89

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.

Other links and lift over

dbSNP: rs397516431; hg19: chr7-107315486; API