rs139449947

Variant names:

• chr6-73482463-G-A
• rs139449947
• NM_012123.4:c.1480G>A
• MTO1 p.Gly494Ser

Variant summary

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

The NM_012123.4(MTO1):​c.1480G>A​(p.Gly494Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000129 in 1,612,506 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00011 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00013 (0 hom.)
• Consequence: MTO1 NM_012123.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 5.03
• Publications: 28 publications found

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: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet

ACMG classification

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_012123.4. 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
	MTO1	NM_012123.4	MANE Select	c.1480G>A	p.Gly494Ser	missense	Exon 9 of 12	NP_036255.2	Q9Y2Z2-4
	MTO1	NM_001123226.2		c.1600G>A	p.Gly534Ser	missense	Exon 10 of 13	NP_001116698.1	Q9Y2Z2-6
	MTO1	NM_133645.3		c.1555G>A	p.Gly519Ser	missense	Exon 10 of 13	NP_598400.1	Q9Y2Z2-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MTO1	ENST00000498286.6	TSL:1 MANE Select	c.1480G>A	p.Gly494Ser	missense	Exon 9 of 12	ENSP00000419561.2	Q9Y2Z2-4
	MTO1	ENST00000415954.6	TSL:1	c.1600G>A	p.Gly534Ser	missense	Exon 10 of 13	ENSP00000402038.2	Q9Y2Z2-6
	MTO1	ENST00000370300.8	TSL:1	c.1555G>A	p.Gly519Ser	missense	Exon 10 of 13	ENSP00000359323.4	Q9Y2Z2-1

Frequencies

GnomAD3 genomes AF: 0.000105 AC: 16 AN: 152144 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

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: 0.000176

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.0000959 AC: 24 AN: 250290 AF XY: 0.0000886

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.0000879

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000168

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000131 AC: 192 AN: 1460244 Hom.: 0 Cov.: 31 AF XY: 0.000128 AC XY: 93 AN XY: 726470

African (AFR) AF: 0.00 AC: 0 AN: 33358

American (AMR) AF: 0.0000677 AC: 3 AN: 44306

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26066

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.00 AC: 0 AN: 86092

European-Finnish (FIN) AF: 0.0000374 AC: 2 AN: 53406

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5406

European-Non Finnish (NFE) AF: 0.000162 AC: 180 AN: 1111626

Other (OTH) AF: 0.000116 AC: 7 AN: 60296

GnomAD4 genome AF: 0.000105 AC: 16 AN: 152262 Hom.: 0 Cov.: 32 AF XY: 0.0000806 AC XY: 6 AN XY: 74442

African (AFR) AF: 0.0000241 AC: 1 AN: 41560

American (AMR) AF: 0.000131 AC: 2 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.00 AC: 0 AN: 4818

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10606

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000176 AC: 12 AN: 68026

Other (OTH) AF: 0.000473 AC: 1 AN: 2114

Alfa AF: 0.000159 Hom.: 0

Bravo AF: 0.000132

EpiCase AF: 0.0000545

EpiControl AF: 0.000415

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Inborn genetic diseases (1)
-	1	-	Mitochondrial hypertrophic cardiomyopathy with lactic acidosis due to MTO1 deficiency (1)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.64	D
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.022	T
MetaRNN	Uncertain	0.64	D
MetaSVM	Uncertain	0.29	D
MutationAssessor	Pathogenic	3.3	M
PhyloP100		5.0
PrimateAI	Benign	0.48	T
PROVEAN	Pathogenic	-5.1	D
REVEL	Uncertain	0.43
Sift	Uncertain	0.0080	D
Sift4G	Uncertain	0.060	T
Varity_R		0.67
gMVP		0.80
Mutation Taster		=41/59	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs139449947;

hg19: chr6-74192186;