Genetic Variant ALG6:p.Met1? (chr1-63370979-T-C) – ACMG Classification: Likely_pathogenic (8 pts)

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_ModeratePS1_ModeratePM2PP5_Moderate

The NM_013339.4(ALG6):c.2T>C(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.000005 in 1,598,706 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

ALG6
NM_013339.4 start_lost

Scores

Clinical Significance

Likely pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 4.17

Variant links:

Genes affected

ALG6 (HGNC:23157): (ALG6 alpha-1,3-glucosyltransferase) This gene encodes a member of the ALG6/ALG8 glucosyltransferase family. The encoded protein catalyzes the addition of the first glucose residue to the growing lipid-linked oligosaccharide precursor of N-linked glycosylation. Mutations in this gene are associated with congenital disorders of glycosylation type Ic. [provided by RefSeq, Jul 2008]

ALG6 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PVS1

Start lost variant, next in-frame start position is after 3 pathogenic variants. Next in-frame start position is after 7 codons. Genomic position: 63370996. Lost 0.012 part of the original CDS.

PS1

Another start lost variant in NM_013339.4 (ALG6) was described as [Conflicting_classifications_of_pathogenicity] in ClinVar as 554144

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 1-63370979-T-C is Pathogenic according to our data. Variant chr1-63370979-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 558047.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG6	NM_013339.4 link	c.2T>C	p.Met1?	start_lost	Exon 2 of 15	ENST00000263440.6	NP_037471.2	Q9Y672

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALG6	ENST00000263440.6 link	c.2T>C	p.Met1?	start_lost	Exon 2 of 15	5	NM_013339.4	ENSP00000263440.5		Q9Y672

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000484

AC:

AN:

1446584

Hom.:

Cov.:

AF XY:

0.00000694

AC XY:

AN XY:

720712

show subpopulations

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:

0.00000637

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152122

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74302

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

ALG6-congenital disorder of glycosylation 1C

Pathogenic:1

Apr 25, 2018

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Pathogenic

0.26

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.11

T;T

Eigen

Uncertain

0.62

Eigen_PC

Uncertain

0.63

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.90

.;D

M_CAP

Pathogenic

0.31

MetaRNN

Pathogenic

0.99

D;D

MetaSVM

Uncertain

-0.031

PROVEAN

Benign

-2.2

N;N

REVEL

Pathogenic

0.65

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Vest4

0.94

MutPred

1.0

Gain of catalytic residue at M1 (P = 0.0216);Gain of catalytic residue at M1 (P = 0.0216);

MVP

0.89

ClinPred

0.99

GERP RS

5.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.80

gMVP

0.89

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over