chr22-42066730-C-A

Variant names:

• chr22-42066730-C-A
• rs121434531
• NM_000262.3:c.577G>T

Variant summary

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

The NM_000262.3(NAGA):​c.577G>T​(p.Glu193*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. 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 Pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NAGA NM_000262.3 stop_gained
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 3.43
• Publications: 4 publications found

Genes affected

NAGA (HGNC:7631): (alpha-N-acetylgalactosaminidase) NAGA encodes the lysosomal enzyme alpha-N-acetylgalactosaminidase, which cleaves alpha-N-acetylgalactosaminyl moieties from glycoconjugates. Mutations in NAGA have been identified as the cause of Schindler disease types I and II (type II also known as Kanzaki disease). [provided by RefSeq, Jul 2008]

NAGA Gene-Disease associations (from GenCC):

• alpha-N-acetylgalactosaminidase deficiency

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• alpha-N-acetylgalactosaminidase deficiency type 2

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, G2P
• alpha-N-acetylgalactosaminidase deficiency type 1

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)
• alpha-N-acetylgalactosaminidase deficiency type 3

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

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

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 22-42066730-C-A is Pathogenic according to our data. Variant chr22-42066730-C-A is described in ClinVar as Pathogenic. ClinVar VariationId is 18164.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000262.3. 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
	NAGA	NM_000262.3	MANE Select	c.577G>T	p.Glu193*	stop_gained	Exon 5 of 9	NP_000253.1
	NAGA	NM_001362848.1		c.577G>T	p.Glu193*	stop_gained	Exon 6 of 10	NP_001349777.1
	NAGA	NM_001362850.1		c.577G>T	p.Glu193*	stop_gained	Exon 6 of 10	NP_001349779.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NAGA	ENST00000396398.8	TSL:1 MANE Select	c.577G>T	p.Glu193*	stop_gained	Exon 5 of 9	ENSP00000379680.3
	NAGA	ENST00000402937.1	TSL:5	c.577G>T	p.Glu193*	stop_gained	Exon 6 of 10	ENSP00000384603.1
	NAGA	ENST00000403363.5	TSL:5	c.577G>T	p.Glu193*	stop_gained	Exon 6 of 10	ENSP00000385283.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Alpha-N-acetylgalactosaminidase deficiency type 2 Pathogenic:1

Jun 01, 1996

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Uncertain	0.94	D
PhyloP100		3.4
Vest4		0.93
GERP RS		5.2
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs121434531; hg19: chr22-42462734;