rs121908444

Variant names:

• chr1-63436928-T-C
• rs121908444
• NM_013339.4:c.1432T>C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_013339.4(ALG6):​c.1432T>C​(p.Ser478Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,600 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ALG6 NM_013339.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.09

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 Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.914
• PP5: Variant 1-63436928-T-C is Pathogenic according to our data. Variant chr1-63436928-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 5498.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG6	NM_013339.4	c.1432T>C	p.Ser478Pro	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.1432T>C	p.Ser478Pro	missense_variant	Exon 15 of 15	5	NM_013339.4	ENSP00000263440.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461600 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727106

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.00152 Hom.: 0

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

ALG6-congenital disorder of glycosylation 1C Pathogenic:2

Jan 01, 2001

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Oct 23, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ALG6 c.1432T>C (p.Ser478Pro) results in a non-conservative amino acid change in the encoded protein sequence. Four of four in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 250952 control chromosomes (gnomAD). c.1432T>C has been reported in the literature in individuals affected with Congenital Disorder Of Glycosylation Type 1C (Imbach_2000). These data indicate that the variant is likely to be associated with disease. This publication also reports experimental evidence evaluating an impact on protein function, finding that the variant results in a failure to rescue glycosylation defect in yeast. The following publication has been ascertained in the context of this evaluation (PMID: 10914684). ClinVar contains an entry for this variant (Variation ID: 5498). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.86
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D;D
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Benign	0.75	.;T
M_CAP	Pathogenic	0.31	D
MetaRNN	Pathogenic	0.91	D;D
MetaSVM	Uncertain	0.52	D
MutationAssessor	Pathogenic	3.4	M;M
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-4.2	D;.
REVEL	Pathogenic	0.85
Sift	Uncertain	0.0070	D;.
Sift4G	Uncertain	0.0080	D;.
Vest4		0.84
MVP		0.97
MPC		1.1
ClinPred		0.99	D
GERP RS		4.0
Varity_R		0.95
gMVP		0.86

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: rs121908444; hg19: chr1-63902599;