Genetic Variant TOMM20L:p.Arg79Trp (chr14-58402734-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_207377.3(TOMM20L):c.235C>T(p.Arg79Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000149 in 1,613,252 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00018 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00015 ( 0 hom. )

Consequence

TOMM20L
NM_207377.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.36

Variant links:

Genes affected

TOMM20L (HGNC:33752): (translocase of outer mitochondrial membrane 20 like) Predicted to enable mitochondrion targeting sequence binding activity. Predicted to contribute to protein transmembrane transporter activity. Predicted to be involved in protein import into mitochondrial matrix and tRNA import into mitochondrion. Predicted to be integral component of membrane. Predicted to be part of mitochondrial outer membrane translocase complex. Predicted to be integral component of mitochondrial outer membrane. [provided by Alliance of Genome Resources, Apr 2022]

TOMM20L links:

ENSG00000258378 (HGNC:):

ENSG00000258378 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TOMM20L	NM_207377.3 link	c.235C>T	p.Arg79Trp	missense_variant	Exon 3 of 5	ENST00000360945.7	NP_997260.1	Q6UXN7
TOMM20L	XM_011536742.4 link	c.259C>T	p.Arg87Trp	missense_variant	Exon 3 of 5		XP_011535044.1
TOMM20L	XM_011536743.3 link	c.259C>T	p.Arg87Trp	missense_variant	Exon 3 of 5		XP_011535045.1
TOMM20L	XM_011536744.4 link	c.137-4592C>T		intron_variant	Intron 1 of 2		XP_011535046.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TOMM20L	ENST00000360945.7 link	c.235C>T	p.Arg79Trp	missense_variant	Exon 3 of 5	1	NM_207377.3	ENSP00000354204.2	Q6UXN7
TOMM20L	ENST00000557754.1 link	n.181-4592C>T		intron_variant	Intron 2 of 3	1		ENSP00000451683.1	G3V4A4
ENSG00000258378	ENST00000556734.1 link	n.374+3804C>T		intron_variant	Intron 1 of 1	3

Frequencies

GnomAD3 genomes

AF:

0.000178

AC:

AN:

152100

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00259

Gnomad EAS

AF:

0.00115

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000132

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000219

AC:

AN:

251184

Hom.:

AF XY:

0.000214

AC XY:

AN XY:

135746

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00288

Gnomad EAS exome

AF:

0.000544

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000114

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000146

AC:

213

AN:

1461032

Hom.:

Cov.:

AF XY:

0.000169

AC XY:

123

AN XY:

726876

show subpopulations

Gnomad4 AFR exome

AF:

0.0000598

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00260

Gnomad4 EAS exome

AF:

0.000530

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.0000945

Gnomad4 OTH exome

AF:

0.000248

GnomAD4 genome

AF:

0.000177

AC:

AN:

152220

Hom.:

Cov.:

AF XY:

0.000202

AC XY:

AN XY:

74438

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00259

Gnomad4 EAS

AF:

0.00116

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000256

Hom.:

Bravo

AF:

0.000159

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.000206

AC:

Asia WGS

AF:

0.00115

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000178

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 12, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.235C>T (p.R79W) alteration is located in exon 3 (coding exon 3) of the TOMM20L gene. This alteration results from a C to T substitution at nucleotide position 235, causing the arginine (R) at amino acid position 79 to be replaced by a tryptophan (W). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.32

BayesDel_noAF

Benign

-0.37

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.098

Eigen

Uncertain

0.35

Eigen_PC

Uncertain

0.38

FATHMM_MKL

Uncertain

0.91

LIST_S2

Benign

0.68

M_CAP

Benign

0.035

MetaRNN

Benign

0.025

MetaSVM

Benign

-0.96

MutationAssessor

Benign

1.2

PrimateAI

Benign

0.21

PROVEAN

Uncertain

-2.8

REVEL

Benign

0.16

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.0020

Polyphen

0.99

Vest4

0.35

MVP

0.45

MPC

1.3

ClinPred

0.23

GERP RS

4.7

Varity_R

0.54

gMVP

0.28

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.23

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.23

Position offset: 27

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