NM_198999.3:c.2177C>G

Variant names:

• chr7-103374457-G-C
• rs150726851
• NM_198999.3:c.2177C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_198999.3(SLC26A5):​c.2177C>G​(p.Ala726Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,892 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A726V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SLC26A5 NM_198999.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.829
• Publications: 0 publications found

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]

SLC26A5 Gene-Disease associations (from GenCC):

• autosomal recessive nonsyndromic hearing loss 61

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), PanelApp Australia
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• nonsyndromic genetic hearing loss

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.10075739).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_198999.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC26A5	NM_198999.3	MANE Select	c.2177C>G	p.Ala726Gly	missense	Exon 20 of 20	NP_945350.1	P58743-1
	SLC26A5	NM_001167962.2		c.2081C>G	p.Ala694Gly	missense	Exon 19 of 19	NP_001161434.1	P58743-5
	SLC26A5	NM_206883.3		c.2041+2351C>G		intron	N/A	NP_996766.1	P58743-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC26A5	ENST00000306312.8	TSL:1 MANE Select	c.2177C>G	p.Ala726Gly	missense	Exon 20 of 20	ENSP00000304783.3	P58743-1
	SLC26A5	ENST00000393727.5	TSL:1	c.2183C>G	p.Ala728Gly	missense	Exon 18 of 18	ENSP00000377328.1	Q7Z7F4
	SLC26A5	ENST00000393723.2	TSL:1	c.2087C>G	p.Ala696Gly	missense	Exon 17 of 17	ENSP00000377324.1	P58743-6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460892 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726752

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33444

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86194

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53414

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4974

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112004

Other (OTH) AF: 0.00 AC: 0 AN: 60304

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.088
BayesDel_addAF	Benign	-0.054	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	7.0
DANN	Benign	0.94
DEOGEN2	Benign	0.15	T
Eigen	Benign	-1.0
Eigen_PC	Benign	-0.98
FATHMM_MKL	Benign	0.11	N
LIST_S2	Uncertain	0.86	D
M_CAP	Uncertain	0.12	D
MetaRNN	Benign	0.10	T
MetaSVM	Uncertain	-0.27	T
MutationAssessor	Benign	0.0	N
PhyloP100		0.83
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-0.71	N
REVEL	Benign	0.17
Sift	Uncertain	0.010	D
Sift4G	Uncertain	0.049	D
Polyphen		0.011	B
Vest4		0.16
MutPred		0.18		Loss of glycosylation at S729 (P = 0.1501)
MVP		0.68
MPC		0.13
ClinPred		0.054	T
GERP RS		1.9
Varity_R		0.065
gMVP		0.14
Mutation Taster		=85/15	polymorphism

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

Other links and lift over

dbSNP: rs150726851; hg19: chr7-103014904;