rs121909725

Variant names:

• chr2-27322448-C-A
• rs121909725
• NM_002437.5:c.70G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Strong

The NM_002437.5(MPV17):​c.70G>T​(p.Gly24Trp) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MPV17 NM_002437.5 missense, splice_region
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 3.82
• Publications: 5 publications found

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]

MPV17 Gene-Disease associations (from GenCC):

• mitochondrial disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• mitochondrial DNA depletion syndrome 6 (hepatocerebral type)

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics, Orphanet
• Charcot-Marie-Tooth disease, axonal, type 2EE

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM1: In a chain Mitochondrial inner membrane protein Mpv17 (size 175) in uniprot entity MPV17_HUMAN there are 23 pathogenic changes around while only 5 benign (82%) in NM_002437.5
• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. Scorers claiming Uncertain: max_spliceai. No scorers claiming Benign.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002437.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MPV17	NM_002437.5	MANE Select	c.70G>T	p.Gly24Trp	missense splice_region	Exon 2 of 8	NP_002428.1	P39210

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MPV17	ENST00000380044.6	TSL:1 MANE Select	c.70G>T	p.Gly24Trp	missense splice_region	Exon 2 of 8	ENSP00000369383.1	P39210
	MPV17	ENST00000233545.6	TSL:1	c.70G>T	p.Gly24Trp	missense splice_region	Exon 1 of 7	ENSP00000233545.2	P39210
	MPV17	ENST00000403262.6	TSL:1	c.70G>T	p.Gly24Trp	missense splice_region	Exon 2 of 8	ENSP00000385671.1	B5MCF8

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	1	-	Mitochondrial DNA depletion syndrome 6 (hepatocerebral type) (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Uncertain	0.031	T
BayesDel_noAF	Pathogenic	0.52
CADD	Pathogenic	36
DANN	Uncertain	0.99
DEOGEN2	Benign	0.041	T
Eigen	Pathogenic	0.83
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Benign	0.33	T
M_CAP	Pathogenic	0.48	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Pathogenic	1.1	D
PhyloP100		3.8
PROVEAN	Benign	-0.41	N
REVEL	Uncertain	0.51
Sift	Benign	0.14	T
Sift4G	Uncertain	0.060	T
Vest4		0.56
MutPred		0.47		Loss of helix (P = 0.0376)
MVP		0.78
ClinPred		1.0	D
GERP RS		4.7
PromoterAI		-0.081	Neutral
Varity_R		0.85
Mutation Taster		=3/97	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.96
Splicevardb		2.0
SpliceAI score (max)		0.26		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.26		Position offset: 13

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs121909725; hg19: chr2-27545315;