NM_013338.5:c.755C>G

Variant names:

• chr13-36965593-G-C
• NM_013338.5:c.755C>G

Variant summary

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

The NM_013338.5(ALG5):​c.755C>G​(p.Ser252Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ALG5 NM_013338.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.67

Genes affected

ALG5 (HGNC:20266): (ALG5 dolichyl-phosphate beta-glucosyltransferase) This gene encodes a member of the glycosyltransferase 2 family. The encoded protein participates in glucosylation of the oligomannose core in N-linked glycosylation of proteins. The addition of glucose residues to the oligomannose core is necessary to ensure substrate recognition, and therefore, effectual transfer of the oligomannose core to the nascent glycoproteins. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Nov 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG5	NM_013338.5	c.755C>G	p.Ser252Cys	missense_variant	Exon 8 of 10	ENST00000239891.4	NP_037470.1
ALG5	NM_001142364.1	c.665C>G	p.Ser222Cys	missense_variant	Exon 7 of 9		NP_001135836.1
ALG5	XM_047430283.1	c.566C>G	p.Ser189Cys	missense_variant	Exon 6 of 8		XP_047286239.1
ALG5	XR_007063678.1	n.931C>G		non_coding_transcript_exon_variant	Exon 9 of 9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALG5	ENST00000239891.4	c.755C>G	p.Ser252Cys	missense_variant	Exon 8 of 10	1	NM_013338.5	ENSP00000239891.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Nov 14, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.755C>G (p.S252C) alteration is located in exon 8 (coding exon 8) of the ALG5 gene. This alteration results from a C to G substitution at nucleotide position 755, causing the serine (S) at amino acid position 252 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.075
BayesDel_addAF	Benign	-0.026	T
BayesDel_noAF	Benign	-0.27
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.54	.;D
Eigen	Uncertain	0.39
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Uncertain	0.91	D;D
M_CAP	Benign	0.023	T
MetaRNN	Uncertain	0.45	T;T
MetaSVM	Benign	-0.78	T
MutationAssessor	Uncertain	2.5	.;M
PrimateAI	Benign	0.38	T
PROVEAN	Uncertain	-3.5	D;D
REVEL	Benign	0.25
Sift	Uncertain	0.026	D;D
Sift4G	Benign	0.076	T;T
Polyphen		0.98	D;D
Vest4		0.52
MutPred		0.52		.;Gain of catalytic residue at L253 (P = 0);
MVP		0.69
MPC		0.32
ClinPred		0.96	D
GERP RS		4.8
Varity_R		0.16
gMVP		0.73

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr13-37539730;