5-96765315-ATAAAG-A

Variant names:

• chr5-96765315-ATAAAG-A
• ENST00000675179.1:c.2017_2021delTAAAG

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001750.7(CAST):​c.2033_2037delTAAAG​(p.Val678GlyfsTer4) variant causes a frameshift, splice region change. The variant allele was found at a frequency of 0.00000173 in 1,155,760 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 0)
  • Exomes 𝑓: 0.0000017 (0 hom.)
• Consequence: CAST NM_001750.7 frameshift, splice_region
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.32

Genes affected

CAST (HGNC:1515): (calpastatin) The protein encoded by this gene is an endogenous calpain (calcium-dependent cysteine protease) inhibitor. It consists of an N-terminal domain L and four repetitive calpain-inhibition domains (domains 1-4), and it is involved in the proteolysis of amyloid precursor protein. The calpain/calpastatin system is involved in numerous membrane fusion events, such as neural vesicle exocytosis and platelet and red-cell aggregation. The encoded protein is also thought to affect the expression levels of genes encoding structural or regulatory proteins. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jun 2010]

ERAP1 (HGNC:18173): (endoplasmic reticulum aminopeptidase 1) The protein encoded by this gene is an aminopeptidase involved in trimming HLA class I-binding precursors so that they can be presented on MHC class I molecules. The encoded protein acts as a monomer or as a heterodimer with ERAP2. This protein may also be involved in blood pressure regulation by inactivation of angiotensin II. Three transcript variants encoding two different isoforms have been found for this gene.[provided by RefSeq, Oct 2010]

ACMG classification

Verdict is Pathogenic. Variant got 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 5-96765315-ATAAAG-A is Pathogenic according to our data. Variant chr5-96765315-ATAAAG-A is described in ClinVar as [Pathogenic]. Clinvar id is 2995747.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CAST	NM_001750.7	c.2033_2037delTAAAG	p.Val678GlyfsTer4	frameshift_variant, splice_region_variant	Exon 26 of 32	ENST00000675179.1	NP_001741.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CAST	ENST00000675179.1	c.2017_2021delTAAAG	p.Pro673GlyfsTer4	frameshift_variant	Exon 26 of 32		NM_001750.7	ENSP00000501872.1

Frequencies

GnomAD3 genomes Cov.: 0

GnomAD4 exome AF: 0.00000173 AC: 2 AN: 1155760 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 587090

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000117

Gnomad4 OTH exome AF: 0.0000201

GnomAD4 genome Cov.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Nov 22, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Val637Glyfs*4) in the CAST gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in CAST are known to be pathogenic (PMID: 25683118, 28851602). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CAST-related conditions. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr5-96101019;