22-46335804-G-T

Variant names:

• chr22-46335804-G-T
• rs751248771
• NM_018006.5:c.40G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_018006.5(TRMU):​c.40G>T​(p.Gly14Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000142 in 1,409,422 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G14S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: TRMU NM_018006.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.01
• Publications: 0 publications found

Genes affected

TRMU (HGNC:25481): (tRNA mitochondrial 2-thiouridylase) This nuclear gene encodes a mitochondrial tRNA-modifying enzyme. The encoded protein catalyzes the 2-thiolation of uridine on the wobble positions of tRNA(Lys), tRNA(Glu), and tRNA(Gln), resulting in the formation of 5-taurinomethyl-2-thiouridine moieties. Mutations in this gene may cause transient infantile liver failure. Polymorphisms in this gene may also influence the severity of deafness caused by mitochondrial 12S ribosomal RNA mutations. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

TRMU Gene-Disease associations (from GenCC):

• acute infantile liver failure due to synthesis defect of mtDNA-encoded proteins

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)
• Leigh syndrome

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• mitochondrial myopathy with reversible cytochrome C oxidase deficiency

  Inheritance: Mitochondrial Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.993

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018006.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRMU	NM_018006.5	MANE Select	c.40G>T	p.Gly14Cys	missense	Exon 1 of 11	NP_060476.2
	TRMU	NM_001282782.2		c.-196G>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 10	NP_001269711.1
	TRMU	NM_001282783.2		c.-215G>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 10	NP_001269712.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRMU	ENST00000645190.1	MANE Select	c.40G>T	p.Gly14Cys	missense	Exon 1 of 11	ENSP00000496496.1
	TRMU	ENST00000381019.3	TSL:1	c.40G>T	p.Gly14Cys	missense	Exon 1 of 10	ENSP00000370407.3
	TRMU	ENST00000441818.5	TSL:1	n.40G>T		non_coding_transcript_exon	Exon 1 of 10	ENSP00000393014.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000142 AC: 2 AN: 1409422 Hom.: 0 Cov.: 31 AF XY: 0.00000143 AC XY: 1 AN XY: 697876

African (AFR) AF: 0.00 AC: 0 AN: 32248

American (AMR) AF: 0.00 AC: 0 AN: 38362

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25410

East Asian (EAS) AF: 0.00 AC: 0 AN: 36912

South Asian (SAS) AF: 0.00 AC: 0 AN: 81202

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40068

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5710

European-Non Finnish (NFE) AF: 0.00000183 AC: 2 AN: 1090852

Other (OTH) AF: 0.00 AC: 0 AN: 58658

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.84
BayesDel_addAF	Pathogenic	0.59	D
BayesDel_noAF	Pathogenic	0.61
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.54	D
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.6	H
PhyloP100		8.0
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-7.3	D
REVEL	Pathogenic	0.99
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.91
MutPred		0.96		Loss of glycosylation at S12 (P = 0.1656)
MVP		0.84
MPC		0.50
ClinPred		1.0	D
GERP RS		4.5
PromoterAI		-0.015	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.97
gMVP		0.93
Mutation Taster		=9/91	disease causing

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

Other links and lift over

dbSNP: rs751248771; hg19: chr22-46731701;