10-68416755-T-G

Variant summary

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

The NM_001080449.3(DNA2):c.3068A>C(p.Tyr1023Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: DNA2 NM_001080449.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.68

Genes affected

DNA2 (HGNC:2939): (DNA replication helicase/nuclease 2) This gene encodes a member of the DNA2/NAM7 helicase family. The encoded protein is a conserved helicase/nuclease involved in the maintenance of mitochondrial and nuclear DNA stability. Mutations in this gene are associated with autosomal dominant progressive external ophthalmoplegia-6 (PEOA6) and Seckel syndrome 8. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Sep 2014]

ACMG classification

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/exons	MANE	UniProt
DNA2	NM_001080449.3	c.3068A>C	p.Tyr1023Ser	missense_variant	20/21	ENST00000358410.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNA2	ENST00000358410.8	c.3068A>C	p.Tyr1023Ser	missense_variant	20/21	1	NM_001080449.3	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 31

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

Invitae

Feb 28, 2023

This sequence change replaces tyrosine, which is neutral and polar, with serine, which is neutral and polar, at codon 1023 of the DNA2 protein (p.Tyr1023Ser). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DNA2-related conditions. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on DNA2 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	0.26
BayesDel_addAF	Uncertain	0.089	D
BayesDel_noAF	Benign	-0.11
Cadd	Uncertain	24
Dann	Benign	0.91
DEOGEN2	Benign	0.025	T;T
Eigen	Uncertain	0.20
Eigen_PC	Benign	0.15
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Uncertain	0.12	D
MetaRNN	Uncertain	0.71	D;D
MetaSVM	Benign	-0.47	T
MutationTaster	Benign	1.0	D;D;N
PrimateAI	Benign	0.41	T
PROVEAN	Pathogenic	-5.4	D;D
REVEL	Uncertain	0.54
Sift	Uncertain	0.0030	D;T
Sift4G	Uncertain	0.015	D;T
Polyphen		0.98	D;D
Vest4		0.61
MutPred		0.52		.;Gain of disorder (P = 0.0063);
MVP		0.79
ClinPred		0.96	D
GERP RS		3.9
Varity_R		0.18
gMVP		0.58

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr10-70176512;