Genetic Variant ALG1:p.Met377Leu (chr16-5082615-A-T) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_019109.5(ALG1):c.1129A>T(p.Met377Leu) 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. 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. M377V) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

ALG1
NM_019109.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 7.14

Publications

4 publications found

Variant links:

Genes affected

ALG1 (HGNC:18294): (ALG1 chitobiosyldiphosphodolichol beta-mannosyltransferase) The enzyme encoded by this gene catalyzes the first mannosylation step in the biosynthesis of lipid-linked oligosaccharides. This gene is mutated in congenital disorder of glycosylation type Ik. [provided by RefSeq, Dec 2008]

ALG1 Gene-Disease associations (from GenCC):

ALG1-congenital disorder of glycosylation
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, G2P, Orphanet, Labcorp Genetics (formerly Invitae), PanelApp Australia

ALG1 links:

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ACMG classification

Classification was made for transcript

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, 0.857

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALG1	NM_019109.5 link	c.1129A>T	p.Met377Leu	missense_variant	Exon 11 of 13	ENST00000262374.10	NP_061982.3	Q9BT22-1
ALG1	NM_001438123.1 link	c.1090A>T	p.Met364Leu	missense_variant	Exon 10 of 12		NP_001425052.1
ALG1	NM_001330504.2 link	c.796A>T	p.Met266Leu	missense_variant	Exon 11 of 13		NP_001317433.1	Q9BT22-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALG1	ENST00000262374.10 link	c.1129A>T	p.Met377Leu	missense_variant	Exon 11 of 13	1	NM_019109.5	ENSP00000262374.5		Q9BT22-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.00000137

AC:

AN:

1459694

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726154

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33406

American (AMR)

AF:

0.00

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86164

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53404

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4136

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111830

Other (OTH)

AF:

0.00

AC:

AN:

60206

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.67

BayesDel_addAF

Pathogenic

0.31

BayesDel_noAF

Pathogenic

0.20

CADD

Pathogenic

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.63

.;D;.

Eigen

Pathogenic

0.90

Eigen_PC

Pathogenic

0.81

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.96

.;D;D

M_CAP

Uncertain

0.14

MetaRNN

Pathogenic

0.86

D;D;D

MetaSVM

Uncertain

0.52

MutationAssessor

Pathogenic

4.0

.;H;.

PhyloP100

7.1

PrimateAI

Uncertain

0.54

PROVEAN

Uncertain

-2.8

.;D;D

REVEL

Pathogenic

0.77

Sift

Pathogenic

0.0

.;D;D

Sift4G

Uncertain

0.012

D;D;D

Polyphen

0.98

.;D;.

Vest4

0.75

MutPred

0.79

.;Gain of ubiquitination at K378 (P = 0.1586);.;

MVP

0.86

MPC

2.1

ClinPred

1.0

GERP RS

5.3

Varity_R

0.93

gMVP

0.75

Mutation Taster

=15/85

disease causing

(source)

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

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16-5082615-A-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over