8-17299877-CAC-TAG

Variant names:

• chr8-17299877-CAC-TAG
• NM_004686.5:c.1966_1968delGTGinsCTA
• MTMR7 p.Val656Leu

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_004686.5(MTMR7):​c.1966_1968delGTGinsCTA​(p.Val656Leu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MTMR7 NM_004686.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.15
• Publications: 0 publications found

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]

VPS37A Gene-Disease associations (from GenCC):

• hereditary spastic paraplegia 53

  Inheritance: AR Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• complex hereditary spastic paraplegia

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004686.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MTMR7	NM_004686.5	MANE Select	c.1966_1968delGTGinsCTA	p.Val656Leu	missense	N/A	NP_004677.3
	VPS37A	NM_001363173.2		c.1194+13450_1194+13452delCACinsTAG		intron	N/A	NP_001350102.1	Q8NEZ2-1
	VPS37A	NM_001363172.2		c.906+13450_906+13452delCACinsTAG		intron	N/A	NP_001350101.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MTMR7	ENST00000180173.10	TSL:1 MANE Select	c.1966_1968delGTGinsCTA	p.Val656Leu	missense	N/A	ENSP00000180173.4	Q9Y216-1
	MTMR7	ENST00000915631.1		c.1843_1845delGTGinsCTA	p.Val615Leu	missense	N/A	ENSP00000585690.1
	MTMR7	ENST00000915632.1		c.1723_1725delGTGinsCTA	p.Val575Leu	missense	N/A	ENSP00000585691.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		5.2

Splicing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr8-17157386;