Genetic Variant ALG2:c.*513dupT (chr9-99217420-T-TA) – ACMG Classification: Likely_benign (-1 pts)

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BS1_Supporting

The NM_033087.4(ALG2):c.*513dupT variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00095 in 453,838 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00032 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0013 ( 0 hom. )

Consequence

ALG2
NM_033087.4 3_prime_UTR

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.0750

Publications

0 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

congenital myasthenic syndrome 14
Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
ALG2-congenital disorder of glycosylation
Inheritance: Unknown, AR Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, G2P, Orphanet
congenital myasthenic syndromes with glycosylation defect
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ALG2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000316 (48/152026) while in subpopulation SAS AF = 0.00851 (41/4818). AF 95% confidence interval is 0.00645. There are 0 homozygotes in GnomAd4. There are 36 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_033087.4. 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
	ALG2	NM_033087.4	MANE Select	c.*513dupT		3_prime_UTR	Exon 2 of 2	NP_149078.1	Q9H553-1
	ALG2	NR_024532.2		n.1971dupT		non_coding_transcript_exon	Exon 3 of 3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
ALG2	ENST00000476832.2	TSL:1 MANE Select	c.*513dupT	3_prime_UTR	Exon 2 of 2	ENSP00000417764.1	Q9H553-1
ALG2	ENST00000319033.7	TSL:1	c.*513dupT	3_prime_UTR	Exon 2 of 2	ENSP00000326609.6	Q9H553-2
ALG2	ENST00000906837.1		c.*513dupT	3_prime_UTR	Exon 2 of 2	ENSP00000576896.1

Frequencies

GnomAD3 genomes

AF:

0.000316

AC:

AN:

151908

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000484

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00850

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000736

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00120

AC:

159

AN:

132878

AF XY:

0.00181

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000822

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000577

Gnomad OTH exome

AF:

0.000247

GnomAD4 exome

AF:

0.00127

AC:

383

AN:

301812

Hom.:

Cov.:

AF XY:

0.00185

AC XY:

318

AN XY:

172000

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

8548

American (AMR)

AF:

0.0000733

AC:

AN:

27272

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

10790

East Asian (EAS)

AF:

0.000109

AC:

AN:

9210

South Asian (SAS)

AF:

0.00607

AC:

362

AN:

59622

European-Finnish (FIN)

AF:

0.00

AC:

AN:

12408

Middle Eastern (MID)

AF:

0.00

AC:

AN:

1148

European-Non Finnish (NFE)

AF:

0.0000567

AC:

AN:

158774

Other (OTH)

AF:

0.000641

AC:

AN:

14040

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

126

157

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000316

AC:

AN:

152026

Hom.:

Cov.:

AF XY:

0.000484

AC XY:

AN XY:

74336

show subpopulations

African (AFR)

AF:

0.0000483

AC:

AN:

41444

American (AMR)

AF:

0.00

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00851

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10560

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000736

AC:

AN:

67968

Other (OTH)

AF:

0.00

AC:

AN:

2106

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000434

Hom.:

Bravo

AF:

0.0000907

ClinVar

ClinVar submissions

Significance:Uncertain significance

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

Congenital disorder of glycosylation (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.075

Mutation Taster

=100/0

polymorphism

(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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over