20-50935173-A-G

Position:

• chr20-50935173-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_003859.3(DPM1):​c.742T>C​(p.Ser248Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000275 in 1,456,680 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 Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: DPM1 NM_003859.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 8.71

Genes affected

DPM1 (HGNC:3005): (dolichyl-phosphate mannosyltransferase subunit 1, catalytic) 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. Human DPM1 lacks a carboxy-terminal transmembrane domain and signal sequence and is regulated by DPM2. Mutations in this gene are associated with congenital disorder of glycosylation type Ie. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2015]

ADNP-AS1 (HGNC:51227): (ADNP antisense RNA 1)

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.879
• PP5: Variant 20-50935173-A-G is Pathogenic according to our data. Variant chr20-50935173-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 100634.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DPM1	NM_003859.3	c.742T>C	p.Ser248Pro	missense_variant	9/9	ENST00000371588.10
ADNP-AS1	NR_110008.1	n.149+3724A>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DPM1	ENST00000371588.10	c.742T>C	p.Ser248Pro	missense_variant	9/9	1	NM_003859.3	P1
ADNP-AS1	ENST00000558899.2	n.149+3724A>G		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000275 AC: 4 AN: 1456680 Hom.: 0 Cov.: 28 AF XY: 0.00000138 AC XY: 1 AN XY: 725124

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: 0.00000361

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000688 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital disorder of glycosylation type 1E Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Nov 01, 2021	The DPM1 c.847T>C (p.Ser283Pro) variant, also known as c.742T>C (p.Ser248Pro), is a missense variant that has been reported in at least two studies and is found in four individuals with congenital disorder of glycosylation, including in three in a homozygous state and one in a compound heterozygous state (Garcia-Silva et al. 2004; Medrano et al. 2019). This variant is not found in the Genome Aggregation Database, version 2.1.1 and version 3.1.1, and is in a region of good sequencing coverage, so the variant is presumed to be rare. Analysis of the p.Ser283Pro variant in knockdown zebrafish found that the variant partially reduced DPM1 function, which authors suggest is consistent with a milder phenotype (Ardiccioni et al. 2015). Based on the evidence, the p.Ser283Pro variant is classified as likely pathogenic for congenital disorder of glycosylation. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jan 01, 2004	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.77
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.35
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.39	T;T
Eigen	Benign	0.15
Eigen_PC	Uncertain	0.24
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D
M_CAP	Uncertain	0.10	D
MetaRNN	Pathogenic	0.88	D;D
MetaSVM	Uncertain	-0.12	T
MutationAssessor	Uncertain	2.2	M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-1.8	N;N
REVEL	Pathogenic	0.65
Sift	Benign	0.11	T;T
Sift4G	Benign	0.16	T;T
Polyphen		0.26	B;.
Vest4		0.84
MutPred		0.79		Gain of helix (P = 0.062);.;
MVP		0.97
MPC		0.41
ClinPred		0.91	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.51
gMVP		0.92

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

Other links and lift over

dbSNP: rs587777114; hg19: chr20-49551710;