chr1-39844110-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2PP3PP5_Very_Strong

The NM_017646.6(TRIT1):c.1225G>A(p.Glu409Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000372 in 1,613,160 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

TRIT1
NM_017646.6 missense

Scores

Clinical Significance

Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 6.77

Variant links:

Genes affected

TRIT1 (HGNC:20286): (tRNA isopentenyltransferase 1) This gene encodes a protein that that is targeted to the mitochondrion and modifies transfer RNAs (tRNAs) by adding a dimethylallyl group onto the adenine at position 37. This modification is important for maintaining the correct reading frame during protein translation. This gene is considered a tumor suppressor and its expression can decrease cell growth. Alternative splicing results in multiple transcripts variants, most of which are likely non-functional. [provided by RefSeq, Aug 2015]

TRIT1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.768

PP5

Variant 1-39844110-C-T is Pathogenic according to our data. Variant chr1-39844110-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1201174.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRIT1	NM_017646.6 link	c.1225G>A	p.Glu409Lys	missense_variant	Exon 10 of 11	ENST00000316891.10	NP_060116.2	Q9H3H1-1Q53F11Q3T7C7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TRIT1	ENST00000316891.10 link	c.1225G>A	p.Glu409Lys	missense_variant	Exon 10 of 11	1	NM_017646.6	ENSP00000321810.5	Q9H3H1-1
TRIT1	ENST00000372818.5 link	c.1147G>A	p.Glu383Lys	missense_variant	Exon 9 of 10	1		ENSP00000361905.1	Q9H3H1-4
TRIT1	ENST00000462797.5 link	n.*65G>A		non_coding_transcript_exon_variant	Exon 9 of 10	5		ENSP00000473773.1	S4R2Z0
TRIT1	ENST00000462797.5 link	n.*65G>A		3_prime_UTR_variant	Exon 9 of 10	5		ENSP00000473773.1	S4R2Z0

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152210

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251306

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135812

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1460950

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

726862

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152210

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74342

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000936

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 14, 2023	This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 409 of the TRIT1 protein (p.Glu409Lys). This variant is present in population databases (rs764506732, gnomAD 0.008%). This missense change has been observed in individual(s) with TRIT1-related conditions (PMID: 32948376). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. This variant is also known as c.979G>A (p.Glu327Lys). ClinVar contains an entry for this variant (Variation ID: 1201174). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt TRIT1 protein function with a positive predictive value of 80%. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jan 27, 2025	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 36768505, Cheon (2022)_ article, 32948376) -

Combined oxidative phosphorylation deficiency 35

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Neuberg Centre For Genomic Medicine, NCGM

May 20, 2023

The observed missense variant c.1225G>A(p.Glu409Lys) in TRIT1 gene has been reported previously in compound heterozygousstate in siblings with Combined oxidative phosphorylation deficiency (Yoo S, et al., 2021). Protein structure analysis revealed thatthis variant disrupts the conformation and electrostatic charge of the zinc-finger motif in the tRNA isopentenyltransferase (IPT),impairing binding of the mutant IPT to specific DNA sequences (Yoo S, et al., 2021).The c.1225G>A variant has 0.001% allele frequencyin gnomAD Exomes. This variant has been reported to the ClinVar database as Likely Pathogenic. Multiple lines of computationalevidence (Polyphen, SIFT and Mutation Taster) predict a damaging effect on protein structure and function for this variant. Theamino acid Glutamine at position 409 is changed to a Lysine changing protein sequence and it might alter its composition andphysico-chemical properties. The amino acid change p.Glu409Lys in TRIT1 is predicted as conserved by GERP++ and PhyloP across100 vertebrates. For these reasons, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.88

BayesDel_addAF

Uncertain

0.16

BayesDel_noAF

Pathogenic

0.17

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.078

.;.;T;.;.

Eigen

Uncertain

0.58

Eigen_PC

Uncertain

0.51

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D;D;D;D

M_CAP

Benign

0.043

MetaRNN

Pathogenic

0.77

D;D;D;D;D

MetaSVM

Benign

-0.52

MutationAssessor

Uncertain

2.6

.;.;M;.;.

PrimateAI

Uncertain

0.76

PROVEAN

Benign

-2.3

N;.;N;N;D

REVEL

Uncertain

0.36

Sift

Uncertain

0.0050

D;.;D;D;D

Sift4G

Uncertain

0.015

D;D;T;T;D

Polyphen

1.0, 1.0, 0.99

.;D;D;D;.

Vest4

0.89

MutPred

0.54

.;.;Gain of MoRF binding (P = 0.0021);.;.;

MVP

0.71

MPC

0.95

ClinPred

0.90

GERP RS

5.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.36

gMVP

0.69

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

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