NM_024105.4:c.424T>G

Variant names:

• chr22-49910479-A-C
• rs28942090
• NM_024105.4:c.424T>G

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PS3 PM1 PM2 PP3_Strong PP5_Moderate

The NM_024105.4(ALG12):​c.424T>G​(p.Phe142Val) variant causes a missense change involving the alteration of a conserved nucleotide. 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 Likely pathogenic (★). ClinVar reports functional evidence for this variant: "SCV005904705: "Functional studies provide moderate evidence of the variant having a damaging effect on the gene or gene product (PMID:11983712)."".

• Frequency: Genomes: not found (cov: 33)
• Consequence: ALG12 NM_024105.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 9.20
• Publications: 3 publications found

Genes affected

ALG12 (HGNC:19358): (ALG12 alpha-1,6-mannosyltransferase) This gene encodes a member of the glycosyltransferase 22 family. The encoded protein catalyzes the addition of the eighth mannose residue in an alpha-1,6 linkage onto the dolichol-PP-oligosaccharide precursor (dolichol-PP-Man(7)GlcNAc(2)) required for protein glycosylation. Mutations in this gene have been associated with congenital disorder of glycosylation type Ig (CDG-Ig)characterized by abnormal N-glycosylation. [provided by RefSeq, Jul 2008]

ALG12 Gene-Disease associations (from GenCC):

• ALG12-congenital disorder of glycosylation

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: ClinGen, Orphanet, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 14 ACMG points.

• PS3: PS3 evidence extracted from ClinVar submissions: SCV005904705: "Functional studies provide moderate evidence of the variant having a damaging effect on the gene or gene product (PMID: 11983712)."
• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_024105.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.972
• PP5: Variant 22-49910479-A-C is Pathogenic according to our data. Variant chr22-49910479-A-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3433.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024105.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALG12	NM_024105.4	MANE Select	c.424T>G	p.Phe142Val	missense	Exon 4 of 10	NP_077010.1	Q9BV10

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALG12	ENST00000330817.11	TSL:1 MANE Select	c.424T>G	p.Phe142Val	missense	Exon 4 of 10	ENSP00000333813.5	Q9BV10
	ALG12	ENST00000905517.1		c.424T>G	p.Phe142Val	missense	Exon 4 of 10	ENSP00000575576.1
	ALG12	ENST00000905518.1		c.424T>G	p.Phe142Val	missense	Exon 4 of 10	ENSP00000575577.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
2	-	-	ALG12-congenital disorder of glycosylation (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.81
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.29
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.55	D
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.79
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D
M_CAP	Uncertain	0.22	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Uncertain	0.38	D
MutationAssessor	Pathogenic	3.6	H
PhyloP100		9.2
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-5.8	D
REVEL	Pathogenic	0.81
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.96
MutPred		0.83		Gain of sheet (P = 0.0477)
MVP		0.84
MPC		0.76
ClinPred		1.0	D
GERP RS		4.7
Varity_R		0.97
gMVP		0.77
Mutation Taster		=3/97	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: rs28942090; hg19: chr22-50304127;