rs200068321

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_024079.5(ALG8):c.1285A>G(p.Ile429Val) variant causes a missense change. The variant allele was found at a frequency of 0.000155 in 1,495,074 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00021 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00015 ( 0 hom. )

Consequence

ALG8
NM_024079.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 4.34

Variant links:

Genes affected

ALG8 (HGNC:23161): (ALG8 alpha-1,3-glucosyltransferase) This gene encodes a member of the ALG6/ALG8 glucosyltransferase family. The encoded protein catalyzes the addition of the second glucose residue to the lipid-linked oligosaccharide precursor for N-linked glycosylation of proteins. Mutations in this gene have been associated with congenital disorder of glycosylation type Ih (CDG-Ih). Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

ALG8 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;

BP4

Computational evidence support a benign effect (MetaRNN=0.17699343).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG8	NM_024079.5 link	c.1285A>G	p.Ile429Val	missense_variant	Exon 12 of 13	ENST00000299626.10	NP_076984.2	Q9BVK2-1A0A024R5K5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALG8	ENST00000299626.10 link	c.1285A>G	p.Ile429Val	missense_variant	Exon 12 of 13	1	NM_024079.5	ENSP00000299626.5		Q9BVK2-1

Frequencies

GnomAD3 genomes

AF:

0.000210

AC:

AN:

152076

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.000368

Gnomad OTH

AF:

0.000957

GnomAD3 exomes

AF:

0.000235

AC:

AN:

243018

Hom.:

AF XY:

0.000236

AC XY:

AN XY:

131616

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000267

Gnomad ASJ exome

AF:

0.000103

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000348

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000407

Gnomad OTH exome

AF:

0.000170

GnomAD4 exome

AF:

0.000148

AC:

199

AN:

1342998

Hom.:

Cov.:

AF XY:

0.000168

AC XY:

113

AN XY:

673216

show subpopulations

Gnomad4 AFR exome

AF:

0.0000322

Gnomad4 AMR exome

AF:

0.000298

Gnomad4 ASJ exome

AF:

0.0000398

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000175

Gnomad4 OTH exome

AF:

0.000107

GnomAD4 genome

AF:

0.000210

AC:

AN:

152076

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74282

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.000262

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000368

Gnomad4 OTH

AF:

0.000957

Alfa

AF:

0.000317

Hom.:

Bravo

AF:

0.000246

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000472

AC:

ExAC

AF:

0.000206

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

ALG8 congenital disorder of glycosylation

Uncertain:3

Oct 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 429 of the ALG8 protein (p.Ile429Val). This variant is present in population databases (rs200068321, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with ALG8-related conditions. ClinVar contains an entry for this variant (Variation ID: 538563). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt ALG8 protein function with a negative predictive value of 80%. 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. -

Feb 05, 2018

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

ALG8 congenital disorder of glycosylation;C4693472:Polycystic liver disease 3 with or without kidney cysts

Uncertain:1

Feb 18, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:1

Feb 21, 2025

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis indicates that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.069

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.16

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.18

T;.;.;.

Eigen

Benign

-0.24

Eigen_PC

Benign

-0.083

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.79

T;T;.;T

M_CAP

Benign

0.020

MetaRNN

Benign

0.18

T;T;T;T

MetaSVM

Benign

-0.70

MutationAssessor

Uncertain

2.1

M;.;M;M

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.45

N;N;N;.

REVEL

Uncertain

0.30

Sift

Benign

0.23

T;T;T;.

Sift4G

Benign

0.37

T;T;T;T

Polyphen

0.0

B;.;.;.

Vest4

0.18

MVP

0.64

MPC

0.12

ClinPred

0.065

GERP RS

3.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.039

gMVP

0.20

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