NM_004086.3:c.22G>A

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_004086.3(COCH):c.22G>A(p.Ala8Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000133 in 1,613,378 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00013 ( 0 hom. )

Consequence

COCH
NM_004086.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 0.0240

Variant links:

Genes affected

COCH (HGNC:2180): (cochlin) The protein encoded by this gene is highly conserved in human, mouse, and chicken, showing 94% and 79% amino acid identity of human to mouse and chicken sequences, respectively. Hybridization to this gene was detected in spindle-shaped cells located along nerve fibers between the auditory ganglion and sensory epithelium. These cells accompany neurites at the habenula perforata, the opening through which neurites extend to innervate hair cells. This and the pattern of expression of this gene in chicken inner ear paralleled the histologic findings of acidophilic deposits, consistent with mucopolysaccharide ground substance, in temporal bones from DFNA9 (autosomal dominant nonsyndromic sensorineural deafness 9) patients. Mutations that cause DFNA9 have been reported in this gene. Alternative splicing results in multiple transcript variants encoding the same protein. Additional splice variants encoding distinct isoforms have been described but their biological validities have not been demonstrated. [provided by RefSeq, Oct 2008]

COCH links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.025682867).

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000204 (31/152192) while in subpopulation AMR AF= 0.000523 (8/15292). AF 95% confidence interval is 0.00026. There are 0 homozygotes in gnomad4. There are 17 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COCH	NM_004086.3 link	c.22G>A	p.Ala8Thr	missense_variant	Exon 2 of 12	ENST00000396618.9	NP_004077.1	O43405-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COCH	ENST00000396618.9 link	c.22G>A	p.Ala8Thr	missense_variant	Exon 2 of 12	1	NM_004086.3	ENSP00000379862.3		O43405-1

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00220

Gnomad AMR

AF:

0.000523

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000168

AC:

AN:

250406

Hom.:

AF XY:

0.000177

AC XY:

AN XY:

135610

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000202

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000301

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000125

AC:

183

AN:

1461186

Hom.:

Cov.:

AF XY:

0.000144

AC XY:

105

AN XY:

726964

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000179

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000464

Gnomad4 FIN exome

AF:

0.0000189

Gnomad4 NFE exome

AF:

0.000147

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.000204

AC:

AN:

152192

Hom.:

Cov.:

AF XY:

0.000229

AC XY:

AN XY:

74334

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000523

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000165

Hom.:

Bravo

AF:

0.000234

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000173

AC:

EpiCase

AF:

0.000545

EpiControl

AF:

0.000415

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Dec 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 8 of the COCH protein (p.Ala8Thr). This variant is present in population databases (rs200935305, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with COCH-related conditions. ClinVar contains an entry for this variant (Variation ID: 667098). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt COCH protein function with a negative predictive value of 95%. 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. -

Jan 17, 2023

Athena Diagnostics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Available data are insufficient to determine the clinical significance of the variant at this time. The frequency of this variant in the general population is uninformative in assessment of its pathogenicity (http://gnomad.broadinstitute.org). Computational tools predict that this variant is not damaging. -

Inborn genetic diseases

Uncertain:1

Jun 17, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.22G>A (p.A8T) alteration is located in exon 2 (coding exon 1) of the COCH gene. This alteration results from a G to A substitution at nucleotide position 22, causing the alanine (A) at amino acid position 8 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not specified

Benign:1

Jun 28, 2018

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Ala8Thr variant in COCH is likely benign because it is present in 0.02% (2 0/65614) of European chromosomes by the Exome Aggregation Consortium (ExAC, http ://exac.broadinstitute.org), and computational prediction tools and conservation analyses suggest that this variant may not impact the protein. Of note, marmose t and squirrel monkey have a threonine (Thr) at this position. ACMG/AMP Criteria applied: BS1, BS4. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.33

BayesDel_noAF

Benign

-0.41

CADD

Benign

DANN

Benign

0.88

DEOGEN2

Benign

0.048

.;T;T;.;.;.;T;T

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.085

LIST_S2

Benign

0.27

T;.;.;T;T;T;T;T

M_CAP

Benign

0.079

MetaRNN

Benign

0.026

T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.94

MutationAssessor

Benign

0.0

.;N;N;.;N;.;.;N

PrimateAI

Uncertain

0.52

PROVEAN

Benign

0.47

N;N;.;.;N;N;N;.

REVEL

Benign

0.034

Sift

Benign

0.16

T;T;.;.;T;T;T;.

Sift4G

Benign

0.64

T;T;.;.;T;T;.;.

Polyphen

0.0020

.;B;B;.;.;.;.;B

Vest4

0.046

MVP

0.77

MPC

0.20

ClinPred

0.012

GERP RS

2.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.025

gMVP

0.16

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.12

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over