NM_012123.4:c.1934_1935delGCinsAT

Variant names:

• chr6-73500590-GC-AT
• NM_012123.4:c.1934_1935delGCinsAT
• MTO1 p.Arg645His

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM5

The NM_012123.4(MTO1):​c.1934_1935delGCinsAT​(p.Arg645His) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R645S) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MTO1 NM_012123.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.04
• Publications: 0 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]

EEF1A1 (HGNC:3189): (eukaryotic translation elongation factor 1 alpha 1) This gene encodes an isoform of the alpha subunit of the elongation factor-1 complex, which is responsible for the enzymatic delivery of aminoacyl tRNAs to the ribosome. This isoform (alpha 1) is expressed in brain, placenta, lung, liver, kidney, and pancreas, and the other isoform (alpha 2) is expressed in brain, heart and skeletal muscle. This isoform is identified as an autoantigen in 66% of patients with Felty syndrome. This gene has been found to have multiple copies on many chromosomes, some of which, if not all, represent different pseudogenes. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM5: Other missense variant is known to change same aminoacid residue: Variant chr6-73500589-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 402215.

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.1934_1935delGCinsAT	p.Arg645His	missense	N/A	NP_036255.2	Q9Y2Z2-4
	MTO1	NM_001123226.2		c.2054_2055delGCinsAT	p.Arg685His	missense	N/A	NP_001116698.1	Q9Y2Z2-6
	MTO1	NM_133645.3		c.2009_2010delGCinsAT	p.Arg670His	missense	N/A	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.1934_1935delGCinsAT	p.Arg645His	missense	N/A	ENSP00000419561.2	Q9Y2Z2-4
	MTO1	ENST00000415954.6	TSL:1	c.2054_2055delGCinsAT	p.Arg685His	missense	N/A	ENSP00000402038.2	Q9Y2Z2-6
	MTO1	ENST00000370300.8	TSL:1	c.2009_2010delGCinsAT	p.Arg670His	missense	N/A	ENSP00000359323.4	Q9Y2Z2-1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		6.0

Splicing

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

hg19: chr6-74210313;