3-48466657-TG-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1 PS1_Moderate PM2 PP5_Moderate

The NM_033629.6(TREX1):c.5del(p.Gly2?) variant causes a frameshift, start lost change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TREX1 NM_033629.6 frameshift, start_lost
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.40

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]

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-TREX1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 69 pathogenic variants in the truncated region.
• PS1: Another start lost variant in NM_033629.6 (TREX1) was described as [Conflicting_classifications_of_pathogenicity] in ClinVar as 931952
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-48466657-TG-T is Pathogenic according to our data. Variant chr3-48466657-TG-T is described in ClinVar as [Pathogenic]. Clinvar id is 1455316.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TREX1	NM_033629.6	c.5del	p.Gly2?	frameshift_variant, start_lost	2/2	ENST00000625293.3
ATRIP	NM_130384.3	c.*1106del		3_prime_UTR_variant	13/13	ENST00000320211.10
ATRIP-TREX1	NR_153405.1	n.3314del		non_coding_transcript_exon_variant	15/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TREX1	ENST00000625293.3	c.5del	p.Gly2?	frameshift_variant, start_lost	2/2		NM_033629.6	P1
ATRIP	ENST00000320211.10	c.*1106del		3_prime_UTR_variant	13/13	1	NM_130384.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Jan 18, 2024

This sequence change creates a premature translational stop signal (p.Gly2Alafs*63) in the TREX1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 313 amino acid(s) of the TREX1 protein. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TREX1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1455316). This variant disrupts a region of the TREX1 protein in which other variant(s) (p.Arg164*) have been determined to be pathogenic (PMID: 16845398, 25604658). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: chr3-48508056;