rs148971770

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 3P and 4B. PM1PP2BP4_Strong

The NM_138691.3(TMC1):c.1705A>G(p.Thr569Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000191 in 1,613,398 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. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. T569T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00019 ( 0 hom. )

Consequence

TMC1
NM_138691.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 2.08

Publications

2 publications found

Variant links:

Genes affected

TMC1 (HGNC:16513): (transmembrane channel like 1) This gene is considered a member of a gene family predicted to encode transmembrane proteins. The specific function of this gene is unknown; however, it is known to be required for normal function of cochlear hair cells. Mutations in this gene have been associated with progressive postlingual hearing loss and profound prelingual deafness. [provided by RefSeq, Jul 2008]

TMC1 Gene-Disease associations (from GenCC):

autosomal recessive nonsyndromic hearing loss 7
Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics, PanelApp Australia
nonsyndromic genetic hearing loss
Inheritance: SD, AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, ClinGen
autosomal dominant nonsyndromic hearing loss 36
Inheritance: AD, AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), PanelApp Australia
autosomal dominant nonsyndromic hearing loss
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
hearing loss, autosomal recessive
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

TMC1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 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, 5 uncertain in NM_138691.3

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 27 curated pathogenic missense variants (we use a threshold of 10). The gene has 8 curated benign missense variants. Gene score misZ: 0.85843 (below the threshold of 3.09). Trascript score misZ: 1.5687 (below the threshold of 3.09). GenCC associations: The gene is linked to nonsyndromic genetic hearing loss, autosomal recessive nonsyndromic hearing loss 7, autosomal dominant nonsyndromic hearing loss 36, hearing loss, autosomal recessive, autosomal dominant nonsyndromic hearing loss.

BP4

Computational evidence support a benign effect (MetaRNN=0.036177695).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMC1	NM_138691.3 link	c.1705A>G	p.Thr569Ala	missense_variant	Exon 19 of 24	ENST00000297784.10	NP_619636.2
TMC1	XM_017014256.2 link	c.1708A>G	p.Thr570Ala	missense_variant	Exon 16 of 21		XP_016869745.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMC1	ENST00000297784.10 link	c.1705A>G	p.Thr569Ala	missense_variant	Exon 19 of 24	1	NM_138691.3	ENSP00000297784.6

Frequencies

GnomAD3 genomes

AF:

0.000164

AC:

AN:

152126

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.000289

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

GnomAD2 exomes

AF:

0.000219

AC:

AN:

251340

AF XY:

0.000272

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000924

Gnomad NFE exome

AF:

0.000431

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000194

AC:

283

AN:

1461154

Hom.:

Cov.:

AF XY:

0.000210

AC XY:

153

AN XY:

726900

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33442

American (AMR)

AF:

0.000112

AC:

AN:

44702

Ashkenazi Jewish (ASJ)

AF:

0.000268

AC:

AN:

26098

East Asian (EAS)

AF:

0.00

AC:

AN:

39690

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.0000562

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.000520

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.000234

AC:

260

AN:

1111430

Other (OTH)

AF:

0.0000828

AC:

AN:

60360

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.420

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000164

AC:

AN:

152244

Hom.:

Cov.:

AF XY:

0.000201

AC XY:

AN XY:

74456

show subpopulations

African (AFR)

AF:

0.0000481

AC:

AN:

41538

American (AMR)

AF:

0.000131

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.000289

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000294

AC:

AN:

68022

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000693

Hom.:

Bravo

AF:

0.000128

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ExAC

AF:

0.000255

AC:

EpiCase

AF:

0.000436

EpiControl

AF:

0.000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Oct 08, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Identified as a heterozygous variant in a family with autosomal dominant hearing loss; the family harbored a variant in another gene thought to be causative of the hearing loss (PMID: 31655630); In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 31655630) -

Jun 13, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 569 of the TMC1 protein (p.Thr569Ala). This variant is present in population databases (rs148971770, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with TMC1-related conditions. ClinVar contains an entry for this variant (Variation ID: 229317). 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 TMC1 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. -

not specified

Uncertain:1

Nov 24, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant classified as Uncertain Significance - Favor Benign. The p.Thr569Ala var iant in TMC1 has not been previously identified in individuals with hearing loss , but has been identified in 29/66722 European chromosomes by the Exome Aggregat ion Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs148971770). Comput ational prediction tools and conservation analysis suggest that the p.Thr569Ala variant may not impact the protein, though this information is not predictive en ough to rule out pathogenicity. In summary, while the clinical significance of t he p.Thr569Ala variant is uncertain, these data suggest that it is more likely t o be benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.087

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.48

CADD

Benign

(source)

DANN

Benign

0.77

DEOGEN2

Benign

0.11

T;T;.;T;.

Eigen

Benign

-0.71

Eigen_PC

Benign

-0.47

FATHMM_MKL

Benign

0.36

LIST_S2

Benign

0.55

.;.;T;T;T

M_CAP

Benign

0.021

MetaRNN

Benign

0.036

T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-1.7

N;N;.;N;.

PhyloP100

2.1

PrimateAI

Uncertain

0.70

PROVEAN

Benign

1.8

N;.;.;N;.

REVEL

Benign

0.12

Sift

Benign

0.48

T;.;.;T;.

Sift4G

Benign

1.0

T;.;.;T;.

Polyphen

0.0050

B;B;.;B;.

Vest4

0.33

MutPred

0.42

Loss of helix (P = 0.1706);Loss of helix (P = 0.1706);.;Loss of helix (P = 0.1706);.;

MVP

0.52

MPC

0.17

ClinPred

0.051

GERP RS

6.2

Varity_R

0.10

gMVP

0.69

Mutation Taster

=81/19

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over