NM_014874.4:c.957C>T

Variant names:

Variant summary

Our verdict is Benign. The variant received -15 ACMG points: 1P and 16B. PP3BP6_Very_StrongBS1BS2

The NM_014874.4(MFN2):c.957C>T(p.Gly319Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0102 in 1,614,198 control chromosomes in the GnomAD database, including 126 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0068 ( 6 hom., cov: 32)

Exomes 𝑓: 0.011 ( 120 hom. )

Consequence

MFN2
NM_014874.4 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts U:1B:10

Conservation

PhyloP100: 1.33

Publications

6 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

neuropathy, hereditary motor and sensory, type 6A
Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
Charcot-Marie-Tooth disease, axonal, autosomal recessive, type 2a2b;
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
axonal hereditary motor and sensory neuropathy
Inheritance: SD Classification: DEFINITIVE Submitted by: ClinGen
Charcot-Marie-Tooth disease type 2A2
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
hereditary motor and sensory neuropathy type 6
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
multiple symmetric lipomatosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
severe early-onset axonal neuropathy due to MFN2 deficiency
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

MFN2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -15 ACMG points.

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

BP6

Variant 1-12001541-C-T is Benign according to our data. Variant chr1-12001541-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 138212.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00681 (1038/152336) while in subpopulation NFE AF = 0.0112 (763/68036). AF 95% confidence interval is 0.0106. There are 6 homozygotes in GnomAd4. There are 505 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 6 AD,AR,SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MFN2	NM_014874.4 link	c.957C>T	p.Gly319Gly	synonymous_variant	Exon 9 of 19	ENST00000235329.10	NP_055689.1	O95140-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MFN2	ENST00000235329.10 link	c.957C>T	p.Gly319Gly	synonymous_variant	Exon 9 of 19	1	NM_014874.4	ENSP00000235329.5		O95140-1

Frequencies

GnomAD3 genomes

AF:

0.00682

AC:

1038

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00207

Gnomad AMI

AF:

0.00658

Gnomad AMR

AF:

0.00517

Gnomad ASJ

AF:

0.00173

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.00538

Gnomad FIN

AF:

0.00546

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.0112

Gnomad OTH

AF:

0.00525

GnomAD2 exomes

AF:

0.00762

AC:

1916

AN:

251422

AF XY:

0.00799

show subpopulations

Gnomad AFR exome

AF:

0.00203

Gnomad AMR exome

AF:

0.00289

Gnomad ASJ exome

AF:

0.00268

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00633

Gnomad NFE exome

AF:

0.0122

Gnomad OTH exome

AF:

0.00734

GnomAD4 exome

AF:

0.0106

AC:

15458

AN:

1461862

Hom.:

120

Cov.:

AF XY:

0.0105

AC XY:

7624

AN XY:

727240

show subpopulations

African (AFR)

AF:

0.00173

AC:

AN:

33478

American (AMR)

AF:

0.00318

AC:

142

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00184

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00599

AC:

517

AN:

86256

European-Finnish (FIN)

AF:

0.00631

AC:

337

AN:

53412

Middle Eastern (MID)

AF:

0.00347

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.0125

AC:

13867

AN:

1112002

Other (OTH)

AF:

0.00777

AC:

469

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

945

1891

2836

3782

4727

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

512

1024

1536

2048

2560

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00681

AC:

1038

AN:

152336

Hom.:

Cov.:

AF XY:

0.00678

AC XY:

505

AN XY:

74500

show subpopulations

African (AFR)

AF:

0.00207

AC:

AN:

41578

American (AMR)

AF:

0.00516

AC:

AN:

15296

Ashkenazi Jewish (ASJ)

AF:

0.00173

AC:

AN:

3470

East Asian (EAS)

AF:

0.000386

AC:

AN:

5186

South Asian (SAS)

AF:

0.00538

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00546

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0112

AC:

763

AN:

68036

Other (OTH)

AF:

0.00520

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

Heterozygous variant carriers

122

182

243

304

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00944

Hom.:

Bravo

AF:

0.00620

Asia WGS

AF:

0.00144

AC:

AN:

3478

EpiCase

AF:

0.0111

EpiControl

AF:

0.0108

ClinVar

Significance: Benign/Likely benign

Submissions summary: Uncertain:1Benign:10

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:3

Jan 19, 2024

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 26, 2013

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inherited Neuropathy Consortium

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:literature only

- -

not provided

Benign:3

May 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

MFN2: PP3, BS1, BS2 -

Nov 09, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Charcot-Marie-Tooth disease type 2

Benign:2

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Charcot-Marie-Tooth disease

Benign:1

Molecular Genetics Laboratory, London Health Sciences Centre

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Hereditary motor and sensory neuropathy with optic atrophy

Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.33

CADD

Benign

(source)

DANN

Benign

0.74

PhyloP100

1.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.74

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.74

Position offset: -2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over