7-107698083-T-G

Position:

• chr7-107698083-T-G

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_000441.2(SLC26A4):​c.1586T>G​(p.Ile529Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000206 in 1,457,854 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I529T) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: SLC26A4 NM_000441.2 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5 O:1
• Conservation: PhyloP100: 7.15

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 Pathogenic. Variant got 18 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_000441.2
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr7-107698083-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1687453.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.971
• PP5: Variant 7-107698083-T-G is Pathogenic according to our data. Variant chr7-107698083-T-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 189160.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC26A4	NM_000441.2	c.1586T>G	p.Ile529Ser	missense_variant	14/21	ENST00000644269.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC26A4	ENST00000644269.2	c.1586T>G	p.Ile529Ser	missense_variant	14/21		NM_000441.2	P1
SLC26A4	ENST00000477350.5	n.433T>G		non_coding_transcript_exon_variant	4/5	4
SLC26A4	ENST00000480841.5	n.435T>G		non_coding_transcript_exon_variant	5/8	3
SLC26A4	ENST00000644846.1	c.299T>G	p.Ile100Ser	missense_variant, NMD_transcript_variant	4/10

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000206 AC: 3 AN: 1457854 Hom.: 0 Cov.: 28 AF XY: 0.00000276 AC XY: 2 AN XY: 725542

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000756

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Autosomal recessive nonsyndromic hearing loss 4 Pathogenic:2 Other:1

Pathogenic, criteria provided, single submitter	clinical testing	Division of Hearing and Balance Research, National Hospital Organization Tokyo Medical Center	Jul 01, 2017	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Sep 05, 2021	- -
Affects, no assertion criteria provided	clinical testing;in vitro	National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center	Aug 20, 2019	in vitro experiment -

Pendred syndrome Pathogenic:2

Likely pathogenic, criteria provided, single submitter	literature only	Counsyl	Jan 29, 2015	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Sep 05, 2021	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Nov 10, 2023

This sequence change replaces isoleucine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 529 of the SLC26A4 protein (p.Ile529Ser). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with SLC26A4-related conditions (PMID: 17718863, 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: 189160). 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 95%. 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	0.77
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.46
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.60	D;D
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	.;D
M_CAP	Pathogenic	0.50	D
MetaRNN	Pathogenic	0.97	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.3	M;M
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.62	T
PROVEAN	Pathogenic	-5.5	D;.
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0010	D;.
Polyphen		0.98	D;D
Vest4		0.96
MutPred		0.86		Gain of disorder (P = 0.0039);Gain of disorder (P = 0.0039);
MVP		0.99
MPC		0.051
ClinPred		1.0	D
GERP RS		6.0
Varity_R		0.94
gMVP		0.82

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: rs786204739; hg19: chr7-107338528;