11-72106061-G-A

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2BP4_ModerateBS1_Supporting

The NM_001393500.2(TOMT):c.110G>A(p.Arg37Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000445 in 1,550,752 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/21 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 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000032 ( 1 hom. )

Consequence

TOMT
NM_001393500.2 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 2.65

Variant links:

Genes affected

TOMT (HGNC:55527): (transmembrane O-methyltransferase) This gene encodes a catechol-O-methyltransferase that catalyzes the transfer of a methyl group from S-adenosyl-L-methionine to a hydroxyl group of catechols and is essential for auditory and vestibular function. Mutations in this gene have been associated with nonsyndromic deafness. Readthrough transcription is observed across this gene and the adjacent leucine-rich repeat containing 51 gene. A third locus (GeneID:220074) is defined to represent the readthrough transcripts. [provided by RefSeq, Feb 2021]

TOMT links:

LRTOMT (HGNC:):

LRTOMT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.0838024).

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000158 (24/152310) while in subpopulation EAS AF= 0.00193 (10/5180). AF 95% confidence interval is 0.00105. There are 0 homozygotes in gnomad4. There are 10 alleles in male gnomad4 subpopulation. Median coverage is 32. 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/exons	MANE
TOMT	NM_001393500.2 linkuse as main transcript	c.110G>A	p.Arg37Gln	missense_variant	1/3	ENST00000541899.3
LRTOMT	NM_001145309.4 linkuse as main transcript	c.209G>A	p.Arg70Gln	missense_variant	7/9
LRTOMT	NM_001145308.5 linkuse as main transcript	c.209G>A	p.Arg70Gln	missense_variant	5/7
LRTOMT	NM_001145310.4 linkuse as main transcript	c.89G>A	p.Arg30Gln	missense_variant	7/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TOMT	ENST00000541899.3 linkuse as main transcript	c.110G>A	p.Arg37Gln	missense_variant	1/3	5	NM_001393500.2	P1

Frequencies

GnomAD3 genomes

AF:

0.000158

AC:

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000471

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.000479

GnomAD3 exomes

AF:

0.000129

AC:

AN:

154834

Hom.:

AF XY:

0.000109

AC XY:

AN XY:

82242

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000405

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00156

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000129

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000322

AC:

AN:

1398442

Hom.:

Cov.:

AF XY:

0.0000319

AC XY:

AN XY:

689798

show subpopulations

Gnomad4 AFR exome

AF:

0.0000316

Gnomad4 AMR exome

AF:

0.0000280

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000532

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.000372

Gnomad4 NFE exome

AF:

0.00000278

Gnomad4 OTH exome

AF:

0.0000345

GnomAD4 genome

AF:

0.000158

AC:

AN:

152310

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74468

show subpopulations

Gnomad4 AFR

AF:

0.000144

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000471

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.000474

Alfa

AF:

0.0000660

Hom.:

Bravo

AF:

0.0000718

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 22, 2023

The c.209G>A (p.R70Q) alteration is located in exon 5 (coding exon 3) of the LRTOMT gene. This alteration results from a G to A substitution at nucleotide position 209, causing the arginine (R) at amino acid position 70 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Autosomal recessive nonsyndromic hearing loss 63

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 05, 2021

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 70 of the LRTOMT protein (p.Arg70Gln). This variant is present in population databases (rs188715129, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with LRTOMT-related conditions. ClinVar contains an entry for this variant (Variation ID: 305991). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 22, 2019

The p.Arg70Gln variant in LRTOMT is classified as likely benign because it has been identified in 0.19% (24/12456) of East Asian chromosomes by gnomAD (http://gnomad.broadinstitute.org), and computational prediction tools predict that this variant does not impact the protein. ACMG/AMP Criteria applied: BS1_Supporting, BP4. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.094

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.18

Cadd

Benign

Dann

Uncertain

1.0

DEOGEN2

Benign

0.099

T;T;.

Eigen

Benign

0.14

Eigen_PC

Uncertain

0.22

FATHMM_MKL

Uncertain

0.82

LIST_S2

Benign

0.78

T;.;T

M_CAP

Benign

0.052

MetaRNN

Benign

0.084

T;T;T

MetaSVM

Benign

-0.39

MutationAssessor

Benign

1.2

L;L;.

MutationTaster

Benign

1.0

D;N;N;N

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-0.97

N;N;.

REVEL

Uncertain

0.36

Sift

Benign

0.19

T;T;.

Sift4G

Benign

0.31

T;T;.

Polyphen

0.82

P;P;.

Vest4

0.096

MVP

0.89

MPC

0.072

ClinPred

0.18

GERP RS

4.4

Varity_R

0.12

gMVP

0.41

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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