2-27312575-CG-C

Position:

• chr2-27312575-CG-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_002437.5(MPV17):​c.293del​(p.Pro98ArgfsTer4) variant causes a frameshift change. The variant allele was found at a frequency of 0.000000684 in 1,461,774 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: MPV17 NM_002437.5 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 5.45

Genes affected

MPV17 (HGNC:7224): (mitochondrial inner membrane protein MPV17) This gene encodes a mitochondrial inner membrane protein that is implicated in the metabolism of reactive oxygen species. Mutations in this gene have been associated with the hepatocerebral form of mitochondrial DNA depletion syndrome (MDDS). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-27312575-CG-C is Pathogenic according to our data. Variant chr2-27312575-CG-C is described in ClinVar as [Pathogenic]. Clinvar id is 522374.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-27312575-CG-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MPV17	NM_002437.5	c.293del	p.Pro98ArgfsTer4	frameshift_variant	5/8	ENST00000380044.6	NP_002428.1
MPV17	XM_005264326.5	c.293del	p.Pro98ArgfsTer4	frameshift_variant	5/8		XP_005264383.1
MPV17	XM_017004151.2	c.245del	p.Pro82ArgfsTer4	frameshift_variant	5/8		XP_016859640.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MPV17	ENST00000380044.6	c.293del	p.Pro98ArgfsTer4	frameshift_variant	5/8	1	NM_002437.5	ENSP00000369383	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461774 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727182

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 03, 2021

For these reasons, this variant has been classified as Pathogenic. This variant has been observed in individual(s) with mitochondrial DNA depletion syndrome (PMID: 29282788). ClinVar contains an entry for this variant (Variation ID: 522374). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Pro98Argfs*4) in the MPV17 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in MPV17 are known to be pathogenic (PMID: 23714749). -

Mitochondrial DNA depletion syndrome 6 (hepatocerebral type) Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine

Dec 01, 2017

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1553383480; hg19: chr2-27535442;