rs139521934

Variant names:

• chr1-63436938-A-G
• rs139521934
• NM_013339.4:c.1442A>G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_013339.4(ALG6):​c.1442A>G​(p.Asn481Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000942 in 1,613,632 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 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. N481N) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000072 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000096 (0 hom.)
• Consequence: ALG6 NM_013339.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.97

Genes affected

ALG6 (HGNC:23157): (ALG6 alpha-1,3-glucosyltransferase) This gene encodes a member of the ALG6/ALG8 glucosyltransferase family. The encoded protein catalyzes the addition of the first glucose residue to the growing lipid-linked oligosaccharide precursor of N-linked glycosylation. Mutations in this gene are associated with congenital disorders of glycosylation type Ic. [provided by RefSeq, Jul 2008]

ACMG classification

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=0.17598408).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG6	NM_013339.4	c.1442A>G	p.Asn481Ser	missense_variant	Exon 15 of 15	ENST00000263440.6	NP_037471.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALG6	ENST00000263440.6	c.1442A>G	p.Asn481Ser	missense_variant	Exon 15 of 15	5	NM_013339.4	ENSP00000263440.5

Frequencies

GnomAD3 genomes AF: 0.0000723 AC: 11 AN: 152066 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000131 AC: 33 AN: 250950 Hom.: 0 AF XY: 0.000133 AC XY: 18 AN XY: 135600

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000260

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.0000654

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000168

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000965 AC: 141 AN: 1461566 Hom.: 0 Cov.: 31 AF XY: 0.000106 AC XY: 77 AN XY: 727078

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000268

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000428

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.0000749

Gnomad4 NFE exome AF: 0.0000917

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome AF: 0.0000723 AC: 11 AN: 152066 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74280

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000385

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.000478

Alfa AF: 0.000187 Hom.: 0

Bravo AF: 0.000155

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000233 AC: 2

ExAC AF: 0.000115 AC: 14

EpiCase AF: 0.000109

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

ALG6-congenital disorder of glycosylation 1C Uncertain:1

Jan 14, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 481 of the ALG6 protein (p.Asn481Ser). This variant is present in population databases (rs139521934, gnomAD 0.03%). This missense change has been observed in individual(s) with clinical features of ALG6-related conditions (PMID: 32398770). ClinVar contains an entry for this variant (Variation ID: 128351). 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 ALG6 protein function with a negative predictive value of 95%. 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

Mar 31, 2014

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.35
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.19	T;T
Eigen	Benign	-0.18
Eigen_PC	Benign	0.047
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.91	.;D
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.18	T;T
MetaSVM	Benign	-0.82	T
MutationAssessor	Benign	0.34	N;N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-1.5	N;.
REVEL	Benign	0.29
Sift	Benign	0.11	T;.
Sift4G	Benign	0.078	T;.
Vest4		0.16
MVP		0.83
MPC		0.24
ClinPred		0.054	T
GERP RS		5.2
Varity_R		0.080
gMVP		0.21

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

Other links and lift over

dbSNP: rs139521934; hg19: chr1-63902609;