1-155140023-T-G

Position:

chr1-155140023-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 6P and 1B. PM1PM2PP3_ModerateBS1_Supporting

The NM_153741.2(DPM3):c.218A>C(p.Glu73Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0000731 in 1,613,868 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000079 ( 0 hom. )

Consequence

DPM3
NM_153741.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 7.00

Variant links:

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]

DPM3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM1

In a chain Dolichol-phosphate mannosyltransferase subunit 3 (size 91) in uniprot entity DPM3_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_153741.2

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.914

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.0000794 (116/1461662) while in subpopulation NFE AF= 0.0000944 (105/1111988). AF 95% confidence interval is 0.0000795. There are 0 homozygotes in gnomad4_exome. There are 43 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
DPM3	NM_153741.2 linkuse as main transcript	c.218A>C	p.Glu73Ala	missense_variant	2/2	ENST00000368400.5	NP_714963.1
DPM3	NM_018973.4 linkuse as main transcript	c.308A>C	p.Glu103Ala	missense_variant	1/1		NP_061846.2
DPM3	XM_017001498.2 linkuse as main transcript	c.218A>C	p.Glu73Ala	missense_variant	2/2		XP_016856987.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DPM3	ENST00000368400.5 linkuse as main transcript	c.218A>C	p.Glu73Ala	missense_variant	2/2	1	NM_153741.2	ENSP00000357385	P1	Q9P2X0-1
DPM3	ENST00000368399.1 linkuse as main transcript	c.308A>C	p.Glu103Ala	missense_variant	1/1			ENSP00000357384		Q9P2X0-2
DPM3	ENST00000341298.3 linkuse as main transcript	c.218A>C	p.Glu73Ala	missense_variant	2/2	2		ENSP00000344338	P1	Q9P2X0-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000718

AC:

AN:

250788

Hom.:

AF XY:

0.0000663

AC XY:

AN XY:

135660

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.0000994

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000141

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000794

AC:

116

AN:

1461662

Hom.:

Cov.:

AF XY:

0.0000591

AC XY:

AN XY:

727136

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.000115

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000944

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74356

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000113

Hom.:

Bravo

AF:

0.0000340

ExAC

AF:

0.0000576

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000178

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 25, 2023

The c.218A>C (p.E73A) alteration is located in exon 2 (coding exon 1) of the DPM3 gene. This alteration results from a A to C substitution at nucleotide position 218, causing the glutamic acid (E) at amino acid position 73 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

DPM3-congenital disorder of glycosylation

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 17, 2022

This sequence change replaces glutamic acid, which is acidic and polar, with alanine, which is neutral and non-polar, at codon 73 of the DPM3 protein (p.Glu73Ala). This variant is present in population databases (rs745807155, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with DPM3-related conditions. ClinVar contains an entry for this variant (Variation ID: 582811). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.37

BayesDel_addAF

Uncertain

0.072

BayesDel_noAF

Uncertain

0.11

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.90

.;D;D

Eigen

Pathogenic

0.73

Eigen_PC

Uncertain

0.66

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.89

D;.;D

M_CAP

Uncertain

0.28

MetaRNN

Pathogenic

0.91

D;D;D

MetaSVM

Uncertain

0.19

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.62

PROVEAN

Pathogenic

-5.7

D;D;D

REVEL

Pathogenic

0.73

Sift

Uncertain

0.0030

D;D;D

Sift4G

Uncertain

0.013

D;D;D

Polyphen

1.0

.;D;D

Vest4

0.84

MVP

0.92

MPC

0.99

ClinPred

0.94

GERP RS

4.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.94

gMVP

0.87

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over