NM_012123.4:c.1430G>A

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1PM5PP5

The NM_012123.4(MTO1):c.1430G>A(p.Arg477His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000148 in 1,614,060 control chromosomes in the GnomAD database, with no homozygous occurrence. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R477C) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.00027 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00014 ( 0 hom. )

Consequence

MTO1
NM_012123.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:7U:1

Conservation

PhyloP100: 9.54

Publications

14 publications found

Variant links:

Genes affected

MTO1 (HGNC:19261): (mitochondrial tRNA translation optimization 1) This gene encodes a mitochondrial protein thought to be involved in mitochondrial tRNA modification. The encoded protein may also play a role in the expression of the non-syndromic and aminoglycoside-induced deafness phenotypes associated with a specific mutation in the mitochondrial 12S rRNA gene. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

MTO1 Gene-Disease associations (from GenCC):

mitochondrial disease
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
mitochondrial hypertrophic cardiomyopathy with lactic acidosis due to MTO1 deficiency
Inheritance: AR, Unknown Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, G2P

MTO1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_012123.4

PM5

Other missense variant is known to change same aminoacid residue: Variant chr6-73482208-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 488553.Status of the report is criteria_provided_single_submitter, 1 stars.

PP5

Variant 6-73482209-G-A is Pathogenic according to our data. Variant chr6-73482209-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 89037.We mark this variant Pathogenic, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MTO1	NM_012123.4 link	c.1430G>A	p.Arg477His	missense_variant	Exon 8 of 12	ENST00000498286.6	NP_036255.2	Q9Y2Z2-4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MTO1	ENST00000498286.6 link	c.1430G>A	p.Arg477His	missense_variant	Exon 8 of 12	1	NM_012123.4	ENSP00000419561.2		Q9Y2Z2-4

Frequencies

GnomAD3 genomes

AF:

0.000270

AC:

AN:

152052

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000967

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000755

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000426

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000167

AC:

AN:

251480

AF XY:

0.000177

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000739

Gnomad NFE exome

AF:

0.000202

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000135

AC:

198

AN:

1461890

Hom.:

Cov.:

AF XY:

0.000154

AC XY:

112

AN XY:

727248

show subpopulations

African (AFR)

AF:

0.0000597

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.000580

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000145

AC:

161

AN:

1112008

Other (OTH)

AF:

0.0000662

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

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:

0.000269

AC:

AN:

152170

Hom.:

Cov.:

AF XY:

0.000255

AC XY:

AN XY:

74406

show subpopulations

African (AFR)

AF:

0.0000964

AC:

AN:

41508

American (AMR)

AF:

0.00

AC:

AN:

15258

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.000755

AC:

AN:

10592

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000426

AC:

AN:

68016

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.482

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:

0.000258

Hom.:

Bravo

AF:

0.000144

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.000231

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:7Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Mitochondrial hypertrophic cardiomyopathy with lactic acidosis due to MTO1 deficiency

Pathogenic:4

Jan 08, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 477 of the MTO1 protein (p.Arg477His). This variant is present in population databases (rs201544686, gnomAD 0.08%). This missense change has been observed in individuals with combined oxidative phosphorylation deficiency (PMID: 23929671, 29331171, 29440775). ClinVar contains an entry for this variant (Variation ID: 89037). 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) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on MTO1 protein function. Experimental studies have shown that this missense change affects MTO1 function (PMID: 23929671). For these reasons, this variant has been classified as Pathogenic. -

Nov 08, 2017

Institute of Human Genetics Munich, TUM University Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 01, 2013

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Aug 16, 2019

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was classified as: Pathogenic. The following ACMG criteria were applied in classifying this variant: PS1,PM2,PM3,PS3,PP3. -

not provided

Pathogenic:3

Dec 03, 2015

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

MTO1: PM2, PM3, PM5 -

Feb 16, 2025

Laboratory of Genetics, Children's Clinical University Hospital Latvia

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Uncertain:1

May 16, 2022

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1550G>A (p.R517H) alteration is located in exon 9 (coding exon 9) of the MTO1 gene. This alteration results from a G to A substitution at nucleotide position 1550, causing the arginine (R) at amino acid position 517 to be replaced by a histidine (H). Based on data from gnomAD, the A allele has an overall frequency of 0.02% (52/282870) total alleles studied. The highest observed frequency was 0.07% (18/25122) of European (Finnish) alleles. This alteration has been detected in conjunction with a second MTO1 variant in multiple patients with combined oxidative phosphorylation deficiency (Baruffini, 2013; Kamps, 2018; O'Byrne, 2018). This amino acid position is highly conserved in available vertebrate species. Functional studies in yeast show this variant has a moderate effect on oxidative growth and respiratory activity (Baruffini, 2013). This alteration is predicted to be deleterious by in silico analysis. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Pathogenic

0.29

BayesDel_noAF

Pathogenic

0.50

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.73

.;.;.;D;T

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

1.0

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Pathogenic

1.0

D;D;D;D;D

M_CAP

Pathogenic

0.72

MetaRNN

Uncertain

0.67

D;D;D;D;D

MetaSVM

Uncertain

0.72

MutationAssessor

Pathogenic

4.4

.;.;.;H;.

PhyloP100

9.5

PrimateAI

Uncertain

0.62

PROVEAN

Pathogenic

-4.5

D;D;D;D;D

REVEL

Pathogenic

0.89

Sift

Uncertain

0.0010

D;D;D;D;D

Sift4G

Pathogenic

0.0010

D;D;D;D;D

Polyphen

1.0

D;D;.;D;.

Vest4

0.95

MVP

0.92

MPC

0.97

ClinPred

0.99

GERP RS

5.5

Varity_R

0.58

gMVP

0.91

Mutation Taster

=0/100

disease causing (ClinVar)

(source)

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

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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