X-150592616-T-G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1 PS1_Moderate PM2 PP5_Moderate

The NM_000252.3(MTM1):c.2T>G(p.Met1?) variant causes a start lost change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: MTM1 NM_000252.3 start_lost
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.22

Genes affected

MTM1 (HGNC:7448): (myotubularin 1) This gene encodes a dual-specificity phosphatase that acts on both phosphotyrosine and phosphoserine. It is required for muscle cell differentiation and mutations in this gene have been identified as being responsible for X-linked myotubular myopathy. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PS1: Another start lost variant in NM_000252.3 (MTM1) was described as [Pathogenic] in ClinVar as 158969
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-150592616-T-G is Pathogenic according to our data. Variant chrX-150592616-T-G is described in ClinVar as [Pathogenic]. Clinvar id is 158963.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-150592616-T-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MTM1	NM_000252.3	c.2T>G	p.Met1?	start_lost	2/15	ENST00000370396.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MTM1	ENST00000370396.7	c.2T>G	p.Met1?	start_lost	2/15	1	NM_000252.3	P1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Severe X-linked myotubular myopathy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Feb 08, 2013

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.70
Cadd	Benign	23
Dann	Uncertain	0.98
DEOGEN2	Uncertain	0.44	T;.
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	0.99	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Uncertain	0.74	D
MutationTaster	Benign	1.0	D;D;D;D
PROVEAN	Benign	-1.8	N;D
REVEL	Pathogenic	0.79
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.0060	D;D
Polyphen		0.46	P;.
Vest4		0.98
MutPred		0.98		Gain of MoRF binding (P = 0.0013);Gain of MoRF binding (P = 0.0013);
MVP		1.0
ClinPred		0.99	D
GERP RS		5.7
Varity_R		0.94
gMVP		0.95

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs587783817; hg19: chrX-149761078;