chr8-17299900-C-A

Variant names:

• chr8-17299900-C-A
• NM_004686.5:c.1945G>T

Variant summary

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

The NM_004686.5(MTMR7):​c.1945G>T​(p.Asp649Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MTMR7 NM_004686.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.38

Genes affected

MTMR7 (HGNC:7454): (myotubularin related protein 7) This gene encodes a member of the myotubularin family of tyrosine/dual-specificity phosphatases. The encoded protein is characterized by four distinct domains that are conserved among all members of the myotubularin family: the glucosyltransferase, Rab-like GTPase activator and myotubularins domain, the Rac-induced recruitment domain, the protein tyrosine phosphatases and dual-specificity phosphatases domain and the suppressor of variegation 3-9, enhancer-of-zeste, and trithorax interaction domain. This protein dephosphorylates the target substrates phosphatidylinositol 3-phosphate and inositol 1,3-bisphosphate. A pseudogene of this gene is found on chromosome 5. [provided by RefSeq, Mar 2009]

VPS37A (HGNC:24928): (VPS37A subunit of ESCRT-I) This gene belongs to the VPS37 family, and encodes a component of the ESCRT-I (endosomal sorting complex required for transport I) protein complex, required for the sorting of ubiquitinated transmembrane proteins into internal vesicles of multivesicular bodies. Expression of this gene is downregulated in hepatocellular carcinoma, and mutations in this gene are associated with autosomal recessive spastic paraplegia-53. A related pseudogene has been identified on chromosome 5. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Dec 2012]

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
MTMR7	NM_004686.5	c.1945G>T	p.Asp649Tyr	missense_variant	Exon 14 of 14	ENST00000180173.10	NP_004677.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MTMR7	ENST00000180173.10	c.1945G>T	p.Asp649Tyr	missense_variant	Exon 14 of 14	1	NM_004686.5	ENSP00000180173.4
VPS37A	ENST00000520997.1	n.245C>A		non_coding_transcript_exon_variant	Exon 3 of 3	3
VPS37A	ENST00000521162.5	n.587C>A		non_coding_transcript_exon_variant	Exon 3 of 3	2
VPS37A	ENST00000519515.1	n.52+1742C>A		intron_variant	Intron 1 of 1	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Aug 08, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1945G>T (p.D649Y) alteration is located in exon 14 (coding exon 14) of the MTMR7 gene. This alteration results from a G to T substitution at nucleotide position 1945, causing the aspartic acid (D) at amino acid position 649 to be replaced by a tyrosine (Y). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.27
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.14	T
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D
M_CAP	Uncertain	0.28	D
MetaRNN	Uncertain	0.71	D
MetaSVM	Uncertain	0.63	D
MutationAssessor	Benign	0.90	L
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-0.80	N
REVEL	Uncertain	0.57
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.028	D
Polyphen		0.93	P
Vest4		0.65
MutPred		0.15		Gain of phosphorylation at D649 (P = 0.0174);
MVP		0.94
MPC		0.17
ClinPred		0.86	D
GERP RS		4.9
Varity_R		0.46
gMVP		0.44

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr8-17157409;