1-12004858-C-G

Position:

• chr1-12004858-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP5_Moderate

The NM_014874.4(MFN2):​c.1426C>G​(p.Arg476Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R476P) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MFN2 NM_014874.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.21

Genes affected

MFN2 (HGNC:16877): (mitofusin 2) This gene encodes a mitochondrial membrane protein that participates in mitochondrial fusion and contributes to the maintenance and operation of the mitochondrial network. This protein is involved in the regulation of vascular smooth muscle cell proliferation, and it may play a role in the pathophysiology of obesity. Mutations in this gene cause Charcot-Marie-Tooth disease type 2A2, and hereditary motor and sensory neuropathy VI, which are both disorders of the peripheral nervous system. Defects in this gene have also been associated with early-onset stroke. Two transcript variants encoding the same protein have been identified. [provided by RefSeq, Jul 2008]

MFN2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MFN2. . Gene score misZ 1.6575 (greater than the threshold 3.09). Trascript score misZ 3.2174 (greater than threshold 3.09). GenCC has associacion of gene with Charcot-Marie-Tooth disease type 2A2, axonal hereditary motor and sensory neuropathy, hereditary motor and sensory neuropathy type 6, Charcot-Marie-Tooth disease, axonal, autosomal recessive, type 2a2b;, multiple symmetric lipomatosis, severe early-onset axonal neuropathy due to MFN2 deficiency.
• PP5: Variant 1-12004858-C-G is Pathogenic according to our data. Variant chr1-12004858-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 523025.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MFN2	NM_014874.4	c.1426C>G	p.Arg476Gly	missense_variant	14/19	ENST00000235329.10	NP_055689.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MFN2	ENST00000235329.10	c.1426C>G	p.Arg476Gly	missense_variant	14/19	1	NM_014874.4	ENSP00000235329.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease type 2A2 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Genomic Research Center, Shahid Beheshti University of Medical Sciences

Dec 18, 2017

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.64	D;D
Eigen	Benign	0.17
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.90	D;.
M_CAP	Uncertain	0.13	D
MetaRNN	Uncertain	0.44	T;T
MetaSVM	Uncertain	-0.019	T
MutationAssessor	Uncertain	2.3	M;M
PrimateAI	Uncertain	0.66	T
PROVEAN	Uncertain	-2.6	D;D
REVEL	Uncertain	0.46
Sift	Uncertain	0.0060	D;D
Sift4G	Uncertain	0.033	D;D
Polyphen		0.016	B;B
Vest4		0.58
MutPred		0.40		Loss of sheet (P = 0.0063);Loss of sheet (P = 0.0063);
MVP		0.82
MPC		0.42
ClinPred		0.97	D
GERP RS		5.8
Varity_R		0.34
gMVP		0.63

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

LitVar

Other links and lift over

dbSNP: rs1266361856; hg19: chr1-12064915;