rs113107733

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 1P and 5B. PP2BP4_StrongBS1_Supporting

The NM_033629.6(TREX1):c.679G>A(p.Gly227Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000137 in 1,614,152 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00047 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00010 ( 0 hom. )

Consequence

TREX1
NM_033629.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5B:2

Conservation

PhyloP100: 0.470

Publications

9 publications found

Variant links:

Genes affected

TREX1 (HGNC:12269): (three prime repair exonuclease 1) This gene encodes a nuclear protein with 3' exonuclease activity. The encoded protein may play a role in DNA repair and serve as a proofreading function for DNA polymerase. Mutations in this gene result in Aicardi-Goutieres syndrome, chilblain lupus, Cree encephalitis, and other diseases of the immune system. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2012]

TREX1 links:

ATRIP (HGNC:33499): (ATR interacting protein) This gene encodes an essential component of the DNA damage checkpoint. The encoded protein binds to single-stranded DNA coated with replication protein A. The protein also interacts with the ataxia telangiectasia and Rad3 related protein kinase, resulting in its accumulation at intranuclear foci induced by DNA damage. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2012]

ATRIP Gene-Disease associations (from GenCC):

breast cancer
Inheritance: AD Classification: MODERATE Submitted by: G2P
Seckel syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ATRIP links:

ATRIP-TREX1 (HGNC:):

ATRIP-TREX1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 7 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Trascript score misZ: 0.29847 (below the threshold of 3.09). GenCC associations: The gene is linked to Aicardi-Goutieres syndrome 1, Aicardi-Goutieres syndrome, retinal vasculopathy with cerebral leukoencephalopathy and systemic manifestations, chilblain lupus 1, systemic lupus erythematosus, familial chilblain lupus.

BP4

Computational evidence support a benign effect (MetaRNN=0.0098694265).

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000466 (71/152318) while in subpopulation AFR AF = 0.00164 (68/41558). AF 95% confidence interval is 0.00132. There are 0 homozygotes in GnomAd4. There are 38 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TREX1	NM_033629.6 link	c.679G>A	p.Gly227Ser	missense_variant	Exon 2 of 2	ENST00000625293.3	NP_338599.1	Q9NSU2-3
ATRIP	NM_130384.3 link	c.*1780G>A		3_prime_UTR_variant	Exon 13 of 13	ENST00000320211.10	NP_569055.1	Q8WXE1-1A0A024R2U4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TREX1	ENST00000625293.3 link	c.679G>A	p.Gly227Ser	missense_variant	Exon 2 of 2	6	NM_033629.6	ENSP00000486676.2		Q9NSU2-3
ATRIP	ENST00000320211.10 link	c.*1780G>A		3_prime_UTR_variant	Exon 13 of 13	1	NM_130384.3	ENSP00000323099.3		Q8WXE1-1

Frequencies

GnomAD3 genomes

AF:

0.000466

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00164

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:

0.0000294

Gnomad OTH

AF:

0.000479

GnomAD2 exomes

AF:

0.000127

AC:

AN:

251158

AF XY:

0.000125

show subpopulations

Gnomad AFR exome

AF:

0.00142

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.0000352

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000103

AC:

150

AN:

1461834

Hom.:

Cov.:

AF XY:

0.000120

AC XY:

AN XY:

727220

show subpopulations

African (AFR)

AF:

0.00284

AC:

AN:

33480

American (AMR)

AF:

0.0000671

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.000104

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53364

Middle Eastern (MID)

AF:

0.000867

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000153

AC:

AN:

1112010

Other (OTH)

AF:

0.000331

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000466

AC:

AN:

152318

Hom.:

Cov.:

AF XY:

0.000510

AC XY:

AN XY:

74478

show subpopulations

African (AFR)

AF:

0.00164

AC:

AN:

41558

American (AMR)

AF:

0.00

AC:

AN:

15312

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68026

Other (OTH)

AF:

0.000474

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000233

Hom.:

Bravo

AF:

0.000589

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000148

AC:

Asia WGS

AF:

0.00115

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Jul 23, 2024

Mayo Clinic Laboratories, Mayo Clinic

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BP4 -

Apr 16, 2018

Athena Diagnostics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

not specified

Uncertain:1Benign:1

Mar 19, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: TREX1 c.679G>A (p.Gly227Ser) results in a non-conservative amino acid change located in the Exonuclease, RNase T/DNA polymerase III domain (IPR013520) of the encoded protein sequence. Two of three in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00013 in 251158 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in TREX1 causing Aicardi-Goutieres Syndrome 1-AR (0.00013 vs 0.011), allowing no conclusion about variant significance. c.679G>A has been reported in the literature in one individual affected with SLE, without strong evidence for causality (Lee_2019). These report(s) do not provide unequivocal conclusions about association of the variant with Aicardi-Goutieres Syndrome 1-AR. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 31585108). ClinVar contains an entry for this variant (Variation ID: 586840). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Clinical Genetics, Academic Medical Center

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

TREX1-related disorder

Uncertain:1

Sep 24, 2024

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The TREX1 c.679G>A variant is predicted to result in the amino acid substitution p.Gly227Ser. This variant has been reported in cis with a second variant c.904G>C, p.Ala302Pro in an individual with systemic lupus erythematosus (referred to as G227S+A247P on alternate transcript NM_033629, table S2, Lee-Kirsch et al. 2007. PubMed ID: 17660818). This variant is reported in 0.14% of alleles in individuals of African descent in gnomAD. Although we suspect that this variant may be benign, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Chilblain lupus 1;C0796126:Aicardi-Goutieres syndrome 1;C1860518:Retinal vasculopathy with cerebral leukoencephalopathy and systemic manifestations

Uncertain:1

Jan 06, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 227 of the TREX1 protein (p.Gly227Ser). This variant is present in population databases (rs113107733, gnomAD 0.1%). This missense change has been observed in individual(s) with systemic lupus erythematosus (PMID: 17660818). ClinVar contains an entry for this variant (Variation ID: 586840). An algorithm developed to predict the effect of missense changes on protein structure and function outputs the following: PolyPhen-2: "Benign". The serine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.059

BayesDel_addAF

Benign

-0.37

BayesDel_noAF

Benign

-0.34

CADD

Benign

6.4

(source)

DANN

Benign

0.85

DEOGEN2

Benign

0.0063

T;T;.;T;T;T

Eigen

Benign

-1.2

Eigen_PC

Benign

-0.99

FATHMM_MKL

Benign

0.025

LIST_S2

Benign

0.44

.;T;T;.;.;T

M_CAP

Benign

0.031

MetaRNN

Benign

0.0099

T;T;T;T;T;T

MetaSVM

Benign

-0.52

PhyloP100

0.47

PrimateAI

Benign

0.32

PROVEAN

Benign

1.6

N;.;N;.;.;N

REVEL

Benign

0.22

Sift

Benign

1.0

T;.;T;.;.;T

Sift4G

Benign

1.0

T;.;T;.;.;T

Vest4

0.10

MVP

0.49

ClinPred

0.0088

GERP RS

-0.32

Varity_R

0.034

gMVP

0.13

Mutation Taster

=96/4

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over