rs1555065007

Variant names:

• chr11-95862029-C-T
• rs1555065007
• NM_016156.6:c.431G>A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_016156.6(MTMR2):​c.431G>A​(p.Arg144Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,428 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: MTMR2 NM_016156.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.51

Genes affected

MTMR2 (HGNC:7450): (myotubularin related protein 2) This gene is a member of the myotubularin family of phosphoinositide lipid phosphatases. The encoded protein possesses phosphatase activity towards phosphatidylinositol-3-phosphate and phosphatidylinositol-3,5-bisphosphate. Mutations in this gene are a cause of Charcot-Marie-Tooth disease type 4B, an autosomal recessive demyelinating neuropathy. Alternatively spliced transcript variants encoding multiple isoforms have been found for this gene. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MTMR2	NM_016156.6	c.431G>A	p.Arg144Gln	missense_variant	Exon 5 of 15	ENST00000346299.10	NP_057240.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MTMR2	ENST00000346299.10	c.431G>A	p.Arg144Gln	missense_variant	Exon 5 of 15	1	NM_016156.6	ENSP00000345752.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461428 Hom.: 0 Cov.: 30 AF XY: 0.00000413 AC XY: 3 AN XY: 727050

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease type 4 Uncertain:1

Oct 11, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine with glutamine at codon 144 of the MTMR2 protein (p.Arg144Gln). The arginine residue is highly conserved and there is a small physicochemical difference between arginine and glutamine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with MTMR2-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.53
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Uncertain	26
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.62	D;.;.;.;T
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	D;D;.;.;D
M_CAP	Uncertain	0.090	D
MetaRNN	Uncertain	0.47	T;T;T;T;T
MetaSVM	Uncertain	0.049	D
MutationAssessor	Benign	1.9	L;.;.;.;.
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-2.5	D;D;D;D;N
REVEL	Uncertain	0.40
Sift	Benign	0.032	D;D;D;D;D
Sift4G	Benign	0.087	T;T;T;T;.
Polyphen		0.18	B;.;.;.;.
Vest4		0.32
MutPred		0.46		Loss of phosphorylation at S142 (P = 0.0743);.;.;.;.;
MVP		0.84
MPC		0.37
ClinPred		0.91	D
GERP RS		6.1
Varity_R		0.65
gMVP		0.68

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs1555065007; hg19: chr11-95595193; COSMIC: COSV100656567; COSMIC: COSV100656567;