1-155140035-TC-T

Position:

• chr1-155140035-TC-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_153741.2(DPM3):​c.205del​(p.Asp69ThrfsTer17) variant causes a frameshift change. The variant allele was found at a frequency of 0.000000684 in 1,461,700 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DPM3 NM_153741.2 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.24

Genes affected

DPM3 (HGNC:3007): (dolichyl-phosphate mannosyltransferase subunit 3, regulatory) Dolichol-phosphate mannose (Dol-P-Man) serves as a donor of mannosyl residues on the lumenal side of the endoplasmic reticulum (ER). Lack of Dol-P-Man results in defective surface expression of GPI-anchored proteins. Dol-P-Man is synthesized from GDP-mannose and dolichol-phosphate on the cytosolic side of the ER by the enzyme dolichyl-phosphate mannosyltransferase. The protein encoded by this gene is a subunit of dolichyl-phosphate mannosyltransferase and acts as a stabilizer subunit of the dolichyl-phosphate mannosyltransferase complex. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.265 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-155140035-TC-T is Pathogenic according to our data. Variant chr1-155140035-TC-T is described in ClinVar as [Pathogenic]. Clinvar id is 2762867.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DPM3	NM_153741.2	c.205del	p.Asp69ThrfsTer17	frameshift_variant	2/2	ENST00000368400.5	NP_714963.1
DPM3	NM_018973.4	c.295del	p.Asp99ThrfsTer17	frameshift_variant	1/1		NP_061846.2
DPM3	XM_017001498.2	c.205del	p.Asp69ThrfsTer17	frameshift_variant	2/2		XP_016856987.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DPM3	ENST00000368400.5	c.205del	p.Asp69ThrfsTer17	frameshift_variant	2/2	1	NM_153741.2	ENSP00000357385	P1
DPM3	ENST00000368399.1	c.295del	p.Asp99ThrfsTer17	frameshift_variant	1/1			ENSP00000357384
DPM3	ENST00000341298.3	c.205del	p.Asp69ThrfsTer17	frameshift_variant	2/2	2		ENSP00000344338	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461700 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727160

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

DPM3-congenital disorder of glycosylation Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 12, 2024

This sequence change creates a premature translational stop signal (p.Asp69Thrfs*17) in the DPM3 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 24 amino acid(s) of the DPM3 protein. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DPM3-related conditions. This variant disrupts a region of the DPM3 protein in which other variant(s) (Leu85*) have been determined to be pathogenic (PMID: 31469168; Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

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: chr1-155112511;