chrX-111730398-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_001099922.3(ALG13):c.2372G>A(p.Arg791Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000639 in 1,095,565 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 4 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. R791R) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 24)

Exomes 𝑓: 0.0000064 ( 0 hom. 4 hem. )

Consequence

ALG13
NM_001099922.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.589

Publications

1 publications found

Variant links:

Genes affected

ALG13 (HGNC:30881): (ALG13 UDP-N-acetylglucosaminyltransferase subunit) The protein encoded by this gene is a subunit of a bipartite UDP-N-acetylglucosamine transferase. It heterodimerizes with asparagine-linked glycosylation 14 homolog to form a functional UDP-GlcNAc glycosyltransferase that catalyzes the second sugar addition of the highly conserved oligosaccharide precursor in endoplasmic reticulum N-linked glycosylation. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2009]

ALG13 Gene-Disease associations (from GenCC):

genetic developmental and epileptic encephalopathy
Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
developmental and epileptic encephalopathy, 36
Inheritance: XL Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
non-syndromic X-linked intellectual disability
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ALG13 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.08882591).

BS2

High Hemizygotes in GnomAdExome4 at 4 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG13	NM_001099922.3 link	c.2372G>A	p.Arg791Gln	missense_variant	Exon 20 of 27	ENST00000394780.8	NP_001093392.1	Q9NP73-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALG13	ENST00000394780.8 link	c.2372G>A	p.Arg791Gln	missense_variant	Exon 20 of 27	2	NM_001099922.3	ENSP00000378260.3		Q9NP73-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000565

AC:

AN:

177099

AF XY:

0.00

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000128

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000639

AC:

AN:

1095565

Hom.:

Cov.:

AF XY:

0.0000111

AC XY:

AN XY:

361251

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26358

American (AMR)

AF:

0.00

AC:

AN:

35106

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19354

East Asian (EAS)

AF:

0.00

AC:

AN:

30170

South Asian (SAS)

AF:

0.00

AC:

AN:

53868

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40459

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4064

European-Non Finnish (NFE)

AF:

0.00000833

AC:

AN:

840198

Other (OTH)

AF:

0.00

AC:

AN:

45988

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Hom

Variant carriers

<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

Cov.:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000182

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Developmental and epileptic encephalopathy, 36

Uncertain:1

Feb 07, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 791 of the ALG13 protein (p.Arg791Gln). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with ALG13-related conditions. ClinVar contains an entry for this variant (Variation ID: 540338). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt ALG13 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. -

not provided

Uncertain:1

Sep 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ALG13: PM2, BP4 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.073

BayesDel_addAF

Benign

-0.42

BayesDel_noAF

Benign

-0.84

CADD

Benign

8.0

(source)

DANN

Benign

0.67

DEOGEN2

Benign

0.14

T;.;.;.;.

FATHMM_MKL

Benign

0.18

LIST_S2

Benign

0.32

T;T;.;T;.

M_CAP

Benign

0.019

MetaRNN

Benign

0.089

T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.1

L;.;.;.;.

PhyloP100

0.59

PrimateAI

Benign

0.20

PROVEAN

Benign

-0.030

N;.;N;.;.

REVEL

Benign

0.018

Sift

Benign

0.43

T;.;T;.;.

Sift4G

Benign

0.33

T;T;T;T;T

Polyphen

0.063

B;B;B;B;B

Vest4

0.077

MVP

0.28

MPC

0.21

ClinPred

0.014

GERP RS

-3.2

Varity_R

0.033

gMVP

0.24

Mutation Taster

=97/3

polymorphism

(source)

Splicing

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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over