rs1553181400

Variant names:

• chr1-99851045-G-C
• rs1553181400
• NM_000642.3:c.3G>C

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_000642.3(AGL):​c.3G>C​(p.Met1?) variant causes a start lost change. 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 (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: AGL NM_000642.3 start_lost
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.96
• Publications: 0 publications found

Genes affected

AGL (HGNC:321): (amylo-alpha-1, 6-glucosidase, 4-alpha-glucanotransferase) This gene encodes the glycogen debrancher enzyme which is involved in glycogen degradation. This enzyme has two independent catalytic activities which occur at different sites on the protein: a 4-alpha-glucotransferase activity and a amylo-1,6-glucosidase activity. Mutations in this gene are associated with glycogen storage disease although a wide range of enzymatic and clinical variability occurs which may be due to tissue-specific alternative splicing. Alternatively spliced transcripts encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

AGL Gene-Disease associations (from GenCC):

• glycogen storage disease III

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Ambry Genetics, Laboratory for Molecular Medicine, Myriad Women’s Health, Orphanet, G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 8 pathogenic variants. Next in-frame start position is after 15 codons. Genomic position: 99851085. Lost 0.009 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-99851045-G-C is Pathogenic according to our data. Variant chr1-99851045-G-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 551795.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000642.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AGL	NM_000642.3	MANE Select	c.3G>C	p.Met1?	start_lost	Exon 2 of 34	NP_000633.2
	AGL	NM_000028.3		c.3G>C	p.Met1?	start_lost	Exon 2 of 34	NP_000019.2
	AGL	NM_000643.3		c.3G>C	p.Met1?	start_lost	Exon 2 of 34	NP_000634.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AGL	ENST00000361915.8	TSL:1 MANE Select	c.3G>C	p.Met1?	start_lost	Exon 2 of 34	ENSP00000355106.3
	AGL	ENST00000294724.8	TSL:1	c.3G>C	p.Met1?	start_lost	Exon 2 of 34	ENSP00000294724.4
	AGL	ENST00000370163.7	TSL:1	c.3G>C	p.Met1?	start_lost	Exon 2 of 34	ENSP00000359182.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Glycogen storage disease type III Pathogenic:1

May 08, 2017

Counsyl

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.28
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.081	T
Eigen	Pathogenic	0.69
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.084	D
PhyloP100		6.0
PROVEAN	Benign	-1.1	N
REVEL	Uncertain	0.61
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.99	D
Vest4		0.89
MutPred		0.98		Gain of catalytic residue at M1 (P = 0.0065)
MVP		0.89
ClinPred		1.0	D
GERP RS		5.3
Varity_R		0.86
gMVP		0.38
Mutation Taster		=32/168	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1553181400; hg19: chr1-100316601;