1-39844104-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_017646.6(TRIT1):c.1231G>T(p.Ala411Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A411V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TRIT1 NM_017646.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.73

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29922593).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TRIT1	NM_017646.6	c.1231G>T	p.Ala411Ser	missense_variant	10/11	ENST00000316891.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TRIT1	ENST00000316891.10	c.1231G>T	p.Ala411Ser	missense_variant	10/11	1	NM_017646.6	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Oct 14, 2022

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.083	T
BayesDel_noAF	Benign	-0.36
Cadd	Benign	19
Dann	Uncertain	1.0
Eigen	Uncertain	0.23
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.89	D;D;D;D;D
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.30	T;T;T;T;T
MetaSVM	Benign	-0.85	T
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-0.26	N;.;N;N;N
REVEL	Benign	0.14
Sift	Benign	0.17	T;.;T;T;D
Sift4G	Uncertain	0.058	T;T;T;T;D
Polyphen		0.84, 0.16, 0.12	.;P;B;B;.
Vest4		0.46
MutPred		0.29		.;.;Gain of disorder (P = 0.0287);.;.;
MVP		0.57
MPC		0.29
ClinPred		0.70	D
GERP RS		6.0
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.6
Varity_R		0.10
gMVP		0.10

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.14		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-40309776;