chr3-184243924-G-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_005787.6(ALG3):c.799C>A(p.Gln267Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000248 in 1,613,950 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

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

Exomes 𝑓: 0.000026 ( 0 hom. )

Consequence

ALG3
NM_005787.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.99

Variant links:

Genes affected

ALG3 (HGNC:23056): (ALG3 alpha-1,3- mannosyltransferase) This gene encodes a member of the ALG3 family. The encoded protein catalyses the addition of the first dol-P-Man derived mannose in an alpha 1,3 linkage to Man5GlcNAc2-PP-Dol. Defects in this gene have been associated with congenital disorder of glycosylation type Id (CDG-Id) characterized by abnormal N-glycosylation. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Nov 2008]

ALG3 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG3	NM_005787.6 link	c.799C>A	p.Gln267Lys	missense_variant	Exon 6 of 9	ENST00000397676.8	NP_005778.1	Q92685-1
ALG3	NM_001006941.2 link	c.655C>A	p.Gln219Lys	missense_variant	Exon 6 of 9		NP_001006942.1	Q92685-2
ALG3	NR_024533.1 link	n.730C>A		non_coding_transcript_exon_variant	Exon 5 of 8
ALG3	NR_024534.1 link	n.793C>A		non_coding_transcript_exon_variant	Exon 6 of 9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALG3	ENST00000397676.8 link	c.799C>A	p.Gln267Lys	missense_variant	Exon 6 of 9	1	NM_005787.6	ENSP00000380793.3		Q92685-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152250

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000413

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000684

AC:

AN:

248416

Hom.:

AF XY:

0.0000814

AC XY:

AN XY:

135076

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000556

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000260

AC:

AN:

1461582

Hom.:

Cov.:

AF XY:

0.0000275

AC XY:

AN XY:

727070

show subpopulations

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:

0.000394

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152368

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74506

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000882

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.0000910

AC:

Asia WGS

AF:

0.000866

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

ALG3-congenital disorder of glycosylation

Uncertain:1

Jan 13, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this variant is a rare missense change with uncertain impact on protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant is present in population databases (rs528154210, ExAC 0.07%) but has not been reported in the literature in individuals with a ALG3-related disease. This sequence change replaces glutamine with lysine at codon 267 of the ALG3 protein (p.Gln267Lys). The glutamine residue is moderately conserved and there is a small physicochemical difference between glutamine and lysine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Uncertain

0.076

BayesDel_noAF

Pathogenic

0.23

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.63

D;.;.

Eigen

Uncertain

0.64

Eigen_PC

Pathogenic

0.68

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.94

D;D;D

M_CAP

Benign

0.052

MetaRNN

Uncertain

0.62

D;D;D

MetaSVM

Uncertain

0.30

MutationAssessor

Benign

1.9

L;.;.

PrimateAI

Uncertain

0.64

PROVEAN

Uncertain

-2.5

N;N;N

REVEL

Pathogenic

0.79

Sift

Benign

1.0

T;T;T

Sift4G

Benign

0.11

T;T;T

Polyphen

1.0

D;.;B

Vest4

0.79

MutPred

0.59

Gain of methylation at Q267 (P = 0.0053);.;.;

MVP

0.96

MPC

0.50

ClinPred

0.36

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.62

gMVP

0.81

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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