NM_024079.5:c.896T>C

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_024079.5(ALG8):c.896T>C(p.Ile299Thr) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.00113 in 1,613,828 control chromosomes in the GnomAD database, including 17 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. I299I) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0058 ( 8 hom., cov: 32)

Exomes 𝑓: 0.00065 ( 9 hom. )

Consequence

ALG8
NM_024079.5 missense, splice_region

Scores

Splicing: ADA: 0.0002569

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: 5.43

Publications

6 publications found

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 Gene-Disease associations (from GenCC):

ALG8-congenital disorder of glycosylation
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: PanelApp Australia, G2P, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
polycystic liver disease 3 with or without kidney cysts
Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae), Genomics England PanelApp

ALG8 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0097923875).

BP6

Variant 11-78112652-A-G is Benign according to our data. Variant chr11-78112652-A-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 306218.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00577 (879/152302) while in subpopulation AFR AF = 0.0201 (834/41564). AF 95% confidence interval is 0.0189. There are 8 homozygotes in GnomAd4. There are 432 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 8 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG8	NM_024079.5 link	c.896T>C	p.Ile299Thr	missense_variant, splice_region_variant	Exon 8 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.896T>C	p.Ile299Thr	missense_variant, splice_region_variant	Exon 8 of 13	1	NM_024079.5	ENSP00000299626.5		Q9BVK2-1

Frequencies

GnomAD3 genomes

AF:

0.00576

AC:

877

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0201

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00183

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000103

Gnomad OTH

AF:

0.00430

GnomAD2 exomes

AF:

0.00162

AC:

408

AN:

251420

AF XY:

0.00128

show subpopulations

Gnomad AFR exome

AF:

0.0218

Gnomad AMR exome

AF:

0.00133

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000440

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000647

AC:

946

AN:

1461526

Hom.:

Cov.:

AF XY:

0.000576

AC XY:

419

AN XY:

727062

show subpopulations

African (AFR)

AF:

0.0216

AC:

723

AN:

33460

American (AMR)

AF:

0.00143

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26120

East Asian (EAS)

AF:

0.00

AC:

AN:

39670

South Asian (SAS)

AF:

0.0000696

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53394

Middle Eastern (MID)

AF:

0.00104

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000576

AC:

AN:

1111772

Other (OTH)

AF:

0.00137

AC:

AN:

60368

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.472

Heterozygous variant carriers

106

160

213

266

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

120

150

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00577

AC:

879

AN:

152302

Hom.:

Cov.:

AF XY:

0.00580

AC XY:

432

AN XY:

74472

show subpopulations

African (AFR)

AF:

0.0201

AC:

834

AN:

41564

American (AMR)

AF:

0.00183

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

68026

Other (OTH)

AF:

0.00426

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

140

187

234

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00233

Hom.:

Bravo

AF:

0.00687

ESP6500AA

AF:

0.0216

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00207

AC:

251

Asia WGS

AF:

0.00202

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Sep 17, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

ALG8 congenital disorder of glycosylation

Benign:2

Jan 12, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Likely benign

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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.064

BayesDel_addAF

Benign

-0.25

BayesDel_noAF

Benign

-0.11

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.50

D;.;.;D

Eigen

Uncertain

0.38

Eigen_PC

Uncertain

0.37

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.78

T;.;T;T

MetaRNN

Benign

0.0098

T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.4

L;L;L;.

PhyloP100

5.4

PrimateAI

Benign

0.46

PROVEAN

Uncertain

-2.8

D;D;.;D

REVEL

Uncertain

0.45

Sift

Uncertain

0.022

D;D;.;D

Sift4G

Benign

0.16

T;T;T;.

Polyphen

0.0010

B;.;.;.

Vest4

0.29

MVP

0.97

MPC

0.19

ClinPred

0.039

GERP RS

4.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.18

gMVP

0.46

Mutation Taster

=76/24

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00026

dbscSNV1_RF

Benign

0.050

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over