rs786205670

Variant names:

• chr20-45892873-AC-A
• rs786205670
• NM_000308.4:c.595delC

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000308.4(CTSA):​c.595delC​(p.Leu199PhefsTer59) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CTSA NM_000308.4 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 1.79
• Publications: 1 publications found

Genes affected

CTSA (HGNC:9251): (cathepsin A) This gene encodes a member of the peptidase S10 family of serine carboxypeptidases. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed to generate two chains that comprise the heterodimeric active enzyme. This enzyme possesses deamidase, esterase and carboxypeptidase activities and acts as a scaffold in the lysosomal multienzyme complex. Mutations in this gene are associated with galactosialidosis. [provided by RefSeq, Nov 2015]

CTSA Gene-Disease associations (from GenCC):

• galactosialidosis

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Orphanet, ClinGen, Illumina

ENSG00000271984 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 12 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 20-45892873-AC-A is Pathogenic according to our data. Variant chr20-45892873-AC-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 190458.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CTSA	NM_000308.4	c.595delC	p.Leu199PhefsTer59	frameshift_variant	Exon 6 of 15	ENST00000646241.3	NP_000299.3
CTSA	NM_001127695.3	c.595delC	p.Leu199PhefsTer59	frameshift_variant	Exon 6 of 15		NP_001121167.1
CTSA	NM_001167594.3	c.544delC	p.Leu182PhefsTer59	frameshift_variant	Exon 5 of 14		NP_001161066.2
CTSA	NR_133656.2	n.640delC		non_coding_transcript_exon_variant	Exon 6 of 15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CTSA	ENST00000646241.3	c.595delC	p.Leu199PhefsTer59	frameshift_variant	Exon 6 of 15		NM_000308.4	ENSP00000493613.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Combined deficiency of sialidase AND beta galactosidase Pathogenic:1

Apr 29, 2021

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Non-immune hydrops fetalis Pathogenic:1

Apr 30, 2014

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.8
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs786205670; hg19: chr20-44521512;