1-11981920-GTTTT-GTTTTTTTTT

Variant names:

• chr1-11981920-G-GTTTTT
• rs34602102
• NM_014874.4:c.-149-42_-149-38dupTTTTT

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS2

The NM_014874.4(MFN2):​c.-149-42_-149-38dupTTTTT variant causes a intron change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. There are indicators that this mutation may affect the branch point..

• Frequency:
  • Genomes: 𝑓 0.00018 (2 hom., cov: 0)
  • Failed GnomAD Quality Control
• Consequence: MFN2 NM_014874.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.194
• Publications: 0 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BS2: High Homozygotes in GnomAd4 at 2 AD,AR,SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MFN2	NM_014874.4	c.-149-42_-149-38dupTTTTT		intron_variant	Intron 1 of 18	ENST00000235329.10	NP_055689.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MFN2	ENST00000235329.10	c.-149-42_-149-38dupTTTTT		intron_variant	Intron 1 of 18	1	NM_014874.4	ENSP00000235329.5

Frequencies

GnomAD3 genomes AF: 0.000181 AC: 25 AN: 138002 Hom.: 2 Cov.: 0

Gnomad AFR AF: 0.000309

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000142

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000668

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000107

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

African (AFR) AC: 0 AN: 0

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AC: 0 AN: 0

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AC: 0 AN: 0

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AC: 0 AN: 0

Other (OTH) AC: 0 AN: 0

GnomAD4 genome AF: 0.000181 AC: 25 AN: 138008 Hom.: 2 Cov.: 0 AF XY: 0.000181 AC XY: 12 AN XY: 66270

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.000309 AC: 11 AN: 35612

American (AMR) AF: 0.000142 AC: 2 AN: 14060

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3376

East Asian (EAS) AF: 0.00 AC: 0 AN: 4708

South Asian (SAS) AF: 0.00 AC: 0 AN: 4436

European-Finnish (FIN) AF: 0.000668 AC: 5 AN: 7482

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 262

European-Non Finnish (NFE) AF: 0.000107 AC: 7 AN: 65292

Other (OTH) AF: 0.00 AC: 0 AN: 1896

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000058), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 244

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.19
BranchPoint Hunter		3.0
Mutation Taster		=100/0	polymorphism

Splicing

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

Other links and lift over

dbSNP: rs34602102; hg19: chr1-12041977;