rs757920586

Positions:

• chr9-99221851-G-A
• chr9-99221851-G-C
• chr9-99221851-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_033087.4(ALG2):​c.44C>T​(p.Pro15Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000555 in 1,441,954 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: ALG2 NM_033087.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.65

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.36872086).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ALG2	NM_033087.4	c.44C>T	p.Pro15Leu	missense_variant	1/2	ENST00000476832.2	NP_149078.1
ALG2	NR_024532.2	n.92C>T		non_coding_transcript_exon_variant	1/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ALG2	ENST00000476832.2	c.44C>T	p.Pro15Leu	missense_variant	1/2	1	NM_033087.4	ENSP00000417764.1
ALG2	ENST00000238477.5	n.44C>T		non_coding_transcript_exon_variant	1/3	2		ENSP00000432675.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000451 AC: 1 AN: 221966 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 123184

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000991

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000555 AC: 8 AN: 1441954 Hom.: 0 Cov.: 32 AF XY: 0.00000279 AC XY: 2 AN XY: 717234

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: 0.00000721

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000189

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Uncertain	0.094	D
BayesDel_noAF	Benign	-0.10
CADD	Benign	23
DANN	Benign	0.92
DEOGEN2	Benign	0.059	T
Eigen	Benign	-0.42
Eigen_PC	Benign	-0.22
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.050	D
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	-0.43	N
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	1.6	N
REVEL	Uncertain	0.42
Sift	Benign	1.0	T
Sift4G	Benign	0.68	T
Polyphen		0.070	B
Vest4		0.68
MutPred		0.46		Loss of disorder (P = 0.0179);
MVP		0.82
MPC		0.19
ClinPred		0.20	T
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.11
gMVP		0.61

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: rs757920586; hg19: chr9-101984133;