chr20-50935231-T-C

Position:

• chr20-50935231-T-C

Variant summary

Our verdict is Benign. Variant got -15 ACMG points: 2P and 17B. PM2 BP4_Strong BP6_Very_Strong BP7 BS1

The NM_003859.3(DPM1):​c.684A>G​(p.Pro228=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000418 in 1,578,484 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. P228P) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000069 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000039 (0 hom.)
• Consequence: DPM1 NM_003859.3 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 0.195

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 Benign. Variant got -15 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.55).
• BP6: Variant 20-50935231-T-C is Benign according to our data. Variant chr20-50935231-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 464507.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.195 with no splicing effect.
• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.0000394 (57/1448132) while in subpopulation MID AF= 0.000707 (4/5660). AF 95% confidence interval is 0.000305. There are 0 homozygotes in gnomad4_exome. There are 31 alleles in male gnomad4_exome subpopulation. Median coverage is 27. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DPM1	NM_003859.3	c.684A>G	p.Pro228=	synonymous_variant	9/9	ENST00000371588.10
ADNP-AS1	NR_110008.1	n.149+3782T>C		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DPM1	ENST00000371588.10	c.684A>G	p.Pro228=	synonymous_variant	9/9	1	NM_003859.3	P1
ADNP-AS1	ENST00000558899.2	n.149+3782T>C		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes AF: 0.0000691 AC: 9 AN: 130280 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000264

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000735

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: 0.0000154

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000403 AC: 10 AN: 247978 Hom.: 0 AF XY: 0.0000447 AC XY: 6 AN XY: 134174

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000886

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000336

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000443

Gnomad OTH exome AF: 0.000165

GnomAD4 exome AF: 0.0000394 AC: 57 AN: 1448132 Hom.: 0 Cov.: 27 AF XY: 0.0000430 AC XY: 31 AN XY: 721408

Gnomad4 AFR exome AF: 0.000488

Gnomad4 AMR exome AF: 0.0000898

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000117

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000164

Gnomad4 OTH exome AF: 0.000234

GnomAD4 genome AF: 0.0000690 AC: 9 AN: 130352 Hom.: 0 Cov.: 33 AF XY: 0.0000787 AC XY: 5 AN XY: 63550

Gnomad4 AFR AF: 0.000263

Gnomad4 AMR AF: 0.0000735

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000154

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000868 Hom.: 0

Bravo AF: 0.0000340

EpiCase AF: 0.00

EpiControl AF: 0.0000594

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Apr 04, 2017

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Congenital disorder of glycosylation type 1E Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 06, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.55
CADD	Benign	9.3
DANN	Benign	0.58
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs369538517; hg19: chr20-49551768;