rs201975029

Positions:

chr16-5078843-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 4P and 4B. PM2PM5BP4_Strong

The NM_019109.5(ALG1):c.827G>A(p.Arg276Gln) variant causes a missense change. The variant allele was found at a frequency of 0.000772 in 1,611,896 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R276W) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.00045 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00081 ( 0 hom. )

Consequence

ALG1
NM_019109.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2B:2

Conservation

PhyloP100: 7.03

Variant links:

Genes affected

ALG1 (HGNC:18294): (ALG1 chitobiosyldiphosphodolichol beta-mannosyltransferase) The enzyme encoded by this gene catalyzes the first mannosylation step in the biosynthesis of lipid-linked oligosaccharides. This gene is mutated in congenital disorder of glycosylation type Ik. [provided by RefSeq, Dec 2008]

ALG1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr16-5078842-C-T is described in Lovd as [Pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.06585652).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
ALG1	NM_019109.5 linkuse as main transcript	c.827G>A	p.Arg276Gln	missense_variant	7/13	ENST00000262374.10	NP_061982.3
ALG1	NM_001330504.2 linkuse as main transcript	c.494G>A	p.Arg165Gln	missense_variant	7/13		NP_001317433.1
ALG1	XM_017023457.3 linkuse as main transcript	c.827G>A	p.Arg276Gln	missense_variant	7/12		XP_016878946.1
ALG1	XR_007064892.1 linkuse as main transcript	n.834G>A		non_coding_transcript_exon_variant	7/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ALG1	ENST00000262374.10 linkuse as main transcript	c.827G>A	p.Arg276Gln	missense_variant	7/13	1	NM_019109.5	ENSP00000262374	P1	Q9BT22-1

Frequencies

GnomAD3 genomes

AF:

0.000453

AC:

AN:

152182

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000621

Gnomad FIN

AF:

0.00207

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000651

AC:

162

AN:

248660

Hom.:

AF XY:

0.000659

AC XY:

AN XY:

135010

show subpopulations

Gnomad AFR exome

AF:

0.000128

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.000100

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000915

Gnomad FIN exome

AF:

0.00213

Gnomad NFE exome

AF:

0.000741

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.000805

AC:

1175

AN:

1459596

Hom.:

Cov.:

AF XY:

0.000821

AC XY:

596

AN XY:

726148

show subpopulations

Gnomad4 AFR exome

AF:

0.0000898

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000917

Gnomad4 FIN exome

AF:

0.00216

Gnomad4 NFE exome

AF:

0.000841

Gnomad4 OTH exome

AF:

0.000648

GnomAD4 genome

AF:

0.000453

AC:

AN:

152300

Hom.:

Cov.:

AF XY:

0.000456

AC XY:

AN XY:

74480

show subpopulations

Gnomad4 AFR

AF:

0.0000962

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000621

Gnomad4 FIN

AF:

0.00207

Gnomad4 NFE

AF:

0.000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000520

Hom.:

Bravo

AF:

0.000276

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000519

AC:

EpiCase

AF:

0.000382

EpiControl

AF:

0.000533

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:2Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

ALG1-congenital disorder of glycosylation

Pathogenic:2Uncertain:1Benign:1

Likely pathogenic, no assertion criteria provided	clinical testing	Genomics England Pilot Project, Genomics England	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jul 29, 2019	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genomic Research Center, Shahid Beheshti University of Medical Sciences	Mar 05, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2024	- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Oct 30, 2020

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 26931382, 20679665) -

ALG1-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 16, 2023

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.30

BayesDel_addAF

Benign

-0.093

BayesDel_noAF

Uncertain

0.030

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.60

.;D;D;.

Eigen

Pathogenic

0.74

Eigen_PC

Uncertain

0.62

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.78

.;T;T;T

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.066

T;T;T;T

MetaSVM

Uncertain

0.42

MutationAssessor

Pathogenic

3.3

.;M;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Benign

0.42

PROVEAN

Uncertain

-3.7

.;D;.;D

REVEL

Uncertain

0.54

Sift

Uncertain

0.0020

.;D;.;D

Sift4G

Uncertain

0.0040

D;D;D;D

Polyphen

1.0

.;D;.;.

Vest4

0.69

MVP

0.94

MPC

0.27

ClinPred

0.28

GERP RS

4.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.76

gMVP

0.86

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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