X-150598600-G-T

Position:

• chrX-150598600-G-T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2 PM5 PP3_Strong PP5_Moderate

The NM_000252.3(MTM1):​c.145G>T​(p.Val49Phe) variant causes a missense 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V49I) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 23)
• Consequence: MTM1 NM_000252.3 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 6.84

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 10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrX-150598600-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 158939.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=1, Uncertain_significance=1}.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.983
• PP5: Variant X-150598600-G-T is Pathogenic according to our data. Variant chrX-150598600-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 158940.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-150598600-G-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MTM1	NM_000252.3	c.145G>T	p.Val49Phe	missense_variant	4/15	ENST00000370396.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MTM1	ENST00000370396.7	c.145G>T	p.Val49Phe	missense_variant	4/15	1	NM_000252.3	P1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 23

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
AlphaMissense	Pathogenic	0.68
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.52
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D;.
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Pathogenic	0.97	D;D
M_CAP	Pathogenic	0.92	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	0.80	D
MutationAssessor	Uncertain	2.7	M;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-4.5	D;D
REVEL	Pathogenic	0.88
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.0020	D;D
Polyphen		1.0	D;.
Vest4		0.93
MutPred		0.89		Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);
MVP		1.0
MPC		1.8
ClinPred		0.99	D
GERP RS		5.6
Varity_R		0.99
gMVP		0.96

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.45		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.45		Position offset: -8

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

Publications

LitVar

Other links and lift over

dbSNP: rs587783796; hg19: chrX-149767064; COSMIC: COSV100080387; COSMIC: COSV100080387;