2-27309945-G-T

Variant names:

• chr2-27309945-G-T
• rs121909722
• NM_002437.5:c.498C>A

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1 PM2 PP5

The NM_002437.5(MPV17):​c.498C>A​(p.Asn166Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. N166N) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MPV17 NM_002437.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 3.79
• Publications: 7 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: Uncertain_significance. The variant received 5 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
• PP5: Variant 2-27309945-G-T is Pathogenic according to our data. Variant chr2-27309945-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 16161.Status of the report is no_assertion_criteria_provided, 0 stars.

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.498C>A	p.Asn166Lys	missense	Exon 8 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.498C>A	p.Asn166Lys	missense	Exon 8 of 8	ENSP00000369383.1	P39210
	MPV17	ENST00000233545.6	TSL:1	c.498C>A	p.Asn166Lys	missense	Exon 7 of 7	ENSP00000233545.2	P39210
	MPV17	ENST00000911060.1		c.648C>A	p.Asn216Lys	missense	Exon 10 of 10	ENSP00000581119.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

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

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.032	T
BayesDel_noAF	Uncertain	0.0
CADD	Uncertain	25
DANN	Uncertain	1.0
Eigen	Uncertain	0.21
Eigen_PC	Uncertain	0.23
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.36	T
M_CAP	Pathogenic	0.42	D
MetaRNN	Uncertain	0.61	D
MetaSVM	Uncertain	-0.13	T
PhyloP100		3.8
PROVEAN	Benign	-0.55	N
REVEL	Uncertain	0.42
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.18	T
Polyphen		0.42	B
Vest4		0.38
MutPred		0.51		Loss of sheet (P = 0.1501)
MVP		0.46
ClinPred		1.0	D
GERP RS		4.2
Varity_R		0.95
Mutation Taster		=1/99	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs121909722; hg19: chr2-27532813;