7-107690169-T-C

Position:

• chr7-107690169-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 6P and 1B. PM1 PP3_Strong BS2_Supporting

The NM_000441.2(SLC26A4):​c.1195T>C​(p.Ser399Pro) variant causes a missense change. The variant allele was found at a frequency of 0.0000954 in 1,613,456 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00010 (2 hom.)
• Consequence: SLC26A4 NM_000441.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:9 O:1
• Conservation: PhyloP100: 5.43

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a transmembrane_region Helical (size 20) in uniprot entity S26A4_HUMAN there are 6 pathogenic changes around while only 0 benign (100%) in NM_000441.2
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.949
• BS2: High Homozygotes in GnomAdExome4 at 2 AR geneVariant has number of homozygotes lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC26A4	NM_000441.2	c.1195T>C	p.Ser399Pro	missense_variant	10/21	ENST00000644269.2	NP_000432.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC26A4	ENST00000644269.2	c.1195T>C	p.Ser399Pro	missense_variant	10/21		NM_000441.2	ENSP00000494017	P1

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152168 Hom.: 0 Cov.: 32

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: 0.000829

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.000131 AC: 33 AN: 251032 Hom.: 0 AF XY: 0.000162 AC XY: 22 AN XY: 135634

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.0000993

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000882

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000441

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000999 AC: 146 AN: 1461288 Hom.: 2 Cov.: 30 AF XY: 0.000107 AC XY: 78 AN XY: 726994

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: 0.000916

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000396

Gnomad4 OTH exome AF: 0.000199

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152168 Hom.: 0 Cov.: 32 AF XY: 0.0000807 AC XY: 6 AN XY: 74338

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000829

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.000956

Alfa AF: 0.0000668 Hom.: 0

Bravo AF: 0.0000227

ExAC AF: 0.000123 AC: 15

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:9 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Autosomal recessive nonsyndromic hearing loss 4 Uncertain:3 Other:1

Affects, no assertion criteria provided	in vitro;literature only	National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center	Aug 20, 2019	in vitro experiment -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	Mar 29, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 27, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Pendred syndrome Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 27, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Nov 09, 2021	NM_000441.1(SLC26A4):c.1195T>C(S399P) is a missense variant classified as a variant of uncertain significance in the context of Pendred syndrome. S399P has been observed in a case with relevant disease (PMID: 16283880). Functional assessments of this variant are available in the literature (PMID: 31599023). S399P has been observed in population frequency databases (gnomAD: SAS 0.09%). In summary, there is insufficient evidence to classify NM_000441.1(SLC26A4):c.1195T>C(S399P) as pathogenic or benign. Please note: this variant was assessed in the context of healthy population screening. -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 31, 2022	This sequence change replaces serine, which is neutral and polar, with proline, which is neutral and non-polar, at codon 399 of the SLC26A4 protein (p.Ser399Pro). This variant is present in population databases (rs747431002, gnomAD 0.09%). This missense change has been observed in individual(s) with non-syndromic deafness (PMID: 16283880). ClinVar contains an entry for this variant (Variation ID: 554065). 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. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on SLC26A4 function (PMID: 31599023). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Mar 21, 2023	Identified in the heterozygous state in individuals with nonsyndromic hearing loss, and no second SLC26A4 variant was identified (Hutchin et al., 2005; Adhikary et al., 2015); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Published functional studies demonstrate impaired I-/Cl- antiport activities, but no effect on the HCO3-/Cl- antiport activities (Wasano et al., 2020); This variant is associated with the following publications: (PMID: 34426522, 26188157, 33199029, 35186384, 31599023, 16283880, 27771369) -

Pendred syndrome;C3538946:Autosomal recessive nonsyndromic hearing loss 4 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Feb 28, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.65	D;D
Eigen	Uncertain	0.52
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.82	.;T
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.95	D;D
MetaSVM	Uncertain	0.70	D
MutationAssessor	Benign	1.5	L;L
MutationTaster	Benign	0.99	D
PrimateAI	Uncertain	0.53	T
PROVEAN	Uncertain	-2.5	D;.
REVEL	Pathogenic	0.84
Sift	Uncertain	0.019	D;.
Sift4G	Uncertain	0.025	D;.
Polyphen		1.0	D;D
Vest4		0.81
MutPred		0.89		Loss of glycosylation at S399 (P = 0.0835);Loss of glycosylation at S399 (P = 0.0835);
MVP		0.98
MPC		0.075
ClinPred		0.71	D
GERP RS		5.6
Varity_R		0.83
gMVP		0.93

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: rs747431002; hg19: chr7-107330614; COSMIC: COSV99707197; COSMIC: COSV99707197;