rs1554359670

Positions:

• chr7-107694650-C-A
• chr7-107694650-C-G
• chr7-107694650-C-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000441.2(SLC26A4):​c.1371C>A​(p.Asn457Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000411 in 1,461,340 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 (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: SLC26A4 NM_000441.2 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 2.82

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 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.979
• PP5: Variant 7-107694650-C-A is Pathogenic according to our data. Variant chr7-107694650-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 550172.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC26A4	NM_000441.2	c.1371C>A	p.Asn457Lys	missense_variant	12/21	ENST00000644269.2	NP_000432.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC26A4	ENST00000644269.2	c.1371C>A	p.Asn457Lys	missense_variant	12/21		NM_000441.2	ENSP00000494017.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000411 AC: 6 AN: 1461340 Hom.: 0 Cov.: 30 AF XY: 0.00000413 AC XY: 3 AN XY: 727002

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: 0.00000540

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Autosomal recessive nonsyndromic hearing loss 4 Pathogenic:1 Other:1

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Nov 19, 2023	- -
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 -

Pendred syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Counsyl

Dec 21, 2016

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 06, 2023

This sequence change replaces asparagine, which is neutral and polar, with lysine, which is basic and polar, at codon 457 of the SLC26A4 protein (p.Asn457Lys). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with Pendred syndrome and deafness (PMID: 12676893, 20597900). 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: 550172). 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 have shown that this missense change affects SLC26A4 function (PMID: 31599023). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.89	D;D
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.94	.;D
M_CAP	Uncertain	0.28	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.3	M;M
PrimateAI	Uncertain	0.70	T
PROVEAN	Pathogenic	-6.0	D;.
REVEL	Pathogenic	0.78
Sift	Pathogenic	0.0	D;.
Sift4G	Uncertain	0.0020	D;.
Polyphen		1.0	D;D
Vest4		0.94
MutPred		0.92		Gain of ubiquitination at N457 (P = 0.0267);Gain of ubiquitination at N457 (P = 0.0267);
MVP		1.0
MPC		0.076
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.97
gMVP		0.83

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: rs1554359670; hg19: chr7-107335095; COSMIC: COSV55920263;