chr7-103374422-T-A

Position:

• chr7-103374422-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_198999.3(SLC26A5):​c.2212A>T​(p.Thr738Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,449,826 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SLC26A5 NM_198999.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.12

Genes affected

SLC26A5 (HGNC:9359): (solute carrier family 26 member 5) This gene encodes a member of the SLC26A/SulP transporter family. The protein functions as a molecular motor in motile outer hair cells (OHCs) of the cochlea, inducing changes in cell length that act to amplify sound levels. The transmembrane protein is an incomplete anion transporter, and does not allow anions to cross the cell membrane but instead undergoes a conformational change in response to changes in intracellular Cl- levels that results in a change in cell length. The protein functions at microsecond rates, which is several orders of magnitude faster than conventional molecular motor proteins. Mutations in this gene are potential candidates for causing neurosensory deafness. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Nov 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.10847497).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC26A5	NM_198999.3	c.2212A>T	p.Thr738Ser	missense_variant	20/20	ENST00000306312.8	NP_945350.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC26A5	ENST00000306312.8	c.2212A>T	p.Thr738Ser	missense_variant	20/20	1	NM_198999.3	ENSP00000304783	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000138 AC: 2 AN: 1449826 Hom.: 0 Cov.: 32 AF XY: 0.00000139 AC XY: 1 AN XY: 720810

Gnomad4 AFR exome AF: 0.0000606

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 04, 2023

This sequence change replaces threonine, which is neutral and polar, with serine, which is neutral and polar, at codon 738 of the SLC26A5 protein (p.Thr738Ser). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SLC26A5-related conditions. ClinVar contains an entry for this variant (Variation ID: 1373410). 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 not expected to disrupt SLC26A5 protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.081
BayesDel_addAF	Benign	-0.093	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	17
DANN	Uncertain	0.98
DEOGEN2	Benign	0.18	.;T;.;T;.;T;.
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.28
FATHMM_MKL	Benign	0.090	N
LIST_S2	Benign	0.67	.;T;T;T;T;.;T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.11	T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.19	T
MutationAssessor	Benign	0.0	.;N;.;.;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N;N;N
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-0.46	N;N;N;.;N;N;N
REVEL	Benign	0.25
Sift	Uncertain	0.027	D;D;D;.;D;D;D
Sift4G	Benign	1.0	T;T;T;T;T;T;T
Polyphen		0.16	.;B;.;.;.;.;.
Vest4		0.14
MutPred		0.19		.;Loss of glycosylation at T738 (P = 0.095);.;.;.;.;.;
MVP		0.81
MPC		0.15
ClinPred		0.092	T
GERP RS		4.3
Varity_R		0.063
gMVP		0.29

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: rs200923483; hg19: chr7-103014869;