11-78101073-G-T

Variant names:

• chr11-78101073-G-T
• rs1198913856
• NM_024079.5:c.1472C>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_024079.5(ALG8):​c.1472C>A​(p.Pro491His) 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P491L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ALG8 NM_024079.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.34
• Publications: 1 publications found

Genes affected

ALG8 (HGNC:23161): (ALG8 alpha-1,3-glucosyltransferase) This gene encodes a member of the ALG6/ALG8 glucosyltransferase family. The encoded protein catalyzes the addition of the second glucose residue to the lipid-linked oligosaccharide precursor for N-linked glycosylation of proteins. Mutations in this gene have been associated with congenital disorder of glycosylation type Ih (CDG-Ih). Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

ALG8 Gene-Disease associations (from GenCC):

• autosomal dominant polycystic kidney disease

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• ALG8-congenital disorder of glycosylation

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, PanelApp Australia, G2P, Ambry Genetics
• polycystic liver disease 3 with or without kidney cysts

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.889

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024079.5. 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
	ALG8	NM_024079.5	MANE Select	c.1472C>A	p.Pro491His	missense	Exon 13 of 13	NP_076984.2	A0A024R5K5
	ALG8	NM_001425224.1		c.1565C>A	p.Pro522His	missense	Exon 14 of 14	NP_001412153.1
	ALG8	NM_001425225.1		c.1520C>A	p.Pro507His	missense	Exon 14 of 14	NP_001412154.1	H0YDD3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALG8	ENST00000299626.10	TSL:1 MANE Select	c.1472C>A	p.Pro491His	missense	Exon 13 of 13	ENSP00000299626.5	Q9BVK2-1
	ALG8	ENST00000532440.6	TSL:3	c.1520C>A	p.Pro507His	missense	Exon 14 of 14	ENSP00000433429.2	H0YDD3
	ALG8	ENST00000853774.1		c.1493C>A	p.Pro498His	missense	Exon 13 of 13	ENSP00000523833.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000244 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.67	D
Eigen	Pathogenic	0.77
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.95	D
M_CAP	Uncertain	0.20	D
MetaRNN	Pathogenic	0.89	D
MetaSVM	Uncertain	0.38	D
MutationAssessor	Pathogenic	3.3	M
PhyloP100		8.3
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-7.8	D
REVEL	Pathogenic	0.72
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.85
MutPred		0.67		Loss of catalytic residue at P491 (P = 0.1267)
MVP		0.98
MPC		0.69
ClinPred		1.0	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.90
gMVP		0.81
Mutation Taster		=17/83	disease causing

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: rs1198913856; hg19: chr11-77812119;