Genetic Variant TREX2:p.Arg217Cys (chrX-153444782-G-A) – ACMG Classification: Likely_benign (-6 pts)

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_080701.4(TREX2):c.649C>T(p.Arg217Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000125 in 1,195,999 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 4 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000088 ( 0 hom., 0 hem., cov: 25)

Exomes 𝑓: 0.000013 ( 0 hom. 4 hem. )

Consequence

TREX2
NM_080701.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.938

Variant links:

Genes affected

TREX2 (HGNC:12270): (three prime repair exonuclease 2) This gene encodes a nuclear protein with 3' to 5' exonuclease activity. The encoded protein participates in double-stranded DNA break repair, and may interact with DNA polymerase delta. [provided by RefSeq, Nov 2012]

TREX2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0817869).

BS2

High Hemizygotes in GnomAdExome4 at 4 gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TREX2	NM_080701.4 link	c.649C>T	p.Arg217Cys	missense_variant	Exon 2 of 2	ENST00000370231.3	NP_542432.2	Q9BQ50-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TREX2	ENST00000370231.3 link	c.649C>T	p.Arg217Cys	missense_variant	Exon 2 of 2	5	NM_080701.4	ENSP00000359251.2		Q9BQ50-2

Frequencies

GnomAD3 genomes

AF:

0.00000883

AC:

AN:

113258

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

35408

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000188

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000207

AC:

AN:

145037

Hom.:

AF XY:

0.0000218

AC XY:

AN XY:

45789

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000861

Gnomad SAS exome

AF:

0.0000628

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000264

GnomAD4 exome

AF:

0.0000129

AC:

AN:

1082741

Hom.:

Cov.:

AF XY:

0.0000113

AC XY:

AN XY:

353897

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000193

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000156

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000883

AC:

AN:

113258

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

35408

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000188

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000149

AC:

ExAC

AF:

0.0000168

AC:

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.649C>T (p.R217C) alteration is located in exon 2 (coding exon 1) of the TREX2 gene. This alteration results from a C to T substitution at nucleotide position 649, causing the arginine (R) at amino acid position 217 to be replaced by a cysteine (C). 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

0.095

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.82

CADD

Benign

8.0

DANN

Benign

0.92

DEOGEN2

Uncertain

0.43

.;.;T;.;.;T;T

FATHMM_MKL

Benign

0.26

LIST_S2

Benign

0.55

T;.;T;.;.;.;.

M_CAP

Benign

0.015

MetaRNN

Benign

0.082

T;T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.26

.;.;N;.;.;N;N

PrimateAI

Benign

0.34

PROVEAN

Benign

-2.1

N;N;.;N;N;D;D

REVEL

Benign

0.046

Sift

Benign

0.11

T;T;.;T;T;T;T

Sift4G

Benign

0.14

T;T;T;T;T;T;T

Polyphen

0.0020

.;.;B;.;.;B;B

Vest4

0.11

MVP

0.095

MPC

0.025

ClinPred

0.021

GERP RS

2.2

Varity_R

0.15

gMVP

0.57

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