10-68416702-AG-A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PVS1_Moderate PM2 PP5

The ENST00000440722.2(DNA2):c.1084del(p.Phe364SerfsTer8) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (no stars).

• Frequency: Genomes: not found (cov: 31)
• Consequence: DNA2 ENST00000440722.2 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 9.41

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 5 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. Fraction of 0.0372 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-68416702-AG-A is Pathogenic according to our data. Variant chr10-68416702-AG-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 143932.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr10-68416702-AG-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DNA2	NM_001080449.3	c.3114+6del		splice_donor_region_variant, intron_variant		ENST00000358410.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNA2	ENST00000358410.8	c.3114+6del		splice_donor_region_variant, intron_variant		1	NM_001080449.3	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Ateleiotic dwarfism Pathogenic:1

Likely pathogenic, no assertion criteria provided

research

Department Of Translational Genomics (developmental Genetics Section), King Faisal Specialist Hospital & Research Centre

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Seckel syndrome 8 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Feb 01, 2014

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Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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

Other links and lift over

dbSNP: rs587777614; hg19: chr10-70176459;