rs730882051

Variant names:

• chr9-99221692-A-C
• rs730882051
• NM_033087.4:c.203T>G

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The ENST00000476832.2(ALG2):​c.203T>G​(p.Val68Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V68M) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ALG2 ENST00000476832.2 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.04
• Publications: 6 publications found

Genes affected

ALG2 (HGNC:23159): (ALG2 alpha-1,3/1,6-mannosyltransferase) This gene encodes a member of the glycosyltransferase 1 family. The encoded protein acts as an alpha 1,3 mannosyltransferase, mannosylating Man(2)GlcNAc(2)-dolichol diphosphate and Man(1)GlcNAc(2)-dolichol diphosphate to form Man(3)GlcNAc(2)-dolichol diphosphate. Defects in this gene have been associated with congenital disorder of glycosylation type Ih (CDG-Ii). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2008]

ALG2 Gene-Disease associations (from GenCC):

• congenital myasthenic syndrome 14

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• ALG2-congenital disorder of glycosylation

  Inheritance: Unknown, AR Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, G2P, PanelApp Australia, Orphanet, Ambry Genetics
• congenital myasthenic syndromes with glycosylation defect

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.99
• PP5: Variant 9-99221692-A-C is Pathogenic according to our data. Variant chr9-99221692-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 183019.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000476832.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALG2	NM_033087.4	MANE Select	c.203T>G	p.Val68Gly	missense	Exon 1 of 2	NP_149078.1
	ALG2	NR_024532.2		n.251T>G		non_coding_transcript_exon	Exon 1 of 3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALG2	ENST00000476832.2	TSL:1 MANE Select	c.203T>G	p.Val68Gly	missense	Exon 1 of 2	ENSP00000417764.1
	ALG2	ENST00000238477.5	TSL:2	n.203T>G		non_coding_transcript_exon	Exon 1 of 3	ENSP00000432675.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Congenital myasthenic syndrome 14 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.71
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.65	D
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.64	T
M_CAP	Pathogenic	0.91	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.75	D
MutationAssessor	Pathogenic	3.7	H
PhyloP100		5.0
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-6.3	D
REVEL	Pathogenic	0.88
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.82
MutPred		0.85		Gain of disorder (P = 0.028)
MVP		0.94
MPC		0.85
ClinPred		0.99	D
GERP RS		4.7
PromoterAI		0.089	Neutral
Varity_R		0.96
gMVP		0.94
Mutation Taster		=13/87	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs730882051; hg19: chr9-101983974;