rs1555972628

Variant names:

• chrX-41524004-CAA-C
• rs1555972628
• NM_001367721.1:c.2549_2550delTT

Variant summary

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

The NM_001367721.1(CASK):​c.2549_2550delTT​(p.Phe850CysfsTer18) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 22)
• Consequence: CASK NM_001367721.1 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.59
• Publications: 0 publications found

Genes affected

CASK (HGNC:1497): (calcium/calmodulin dependent serine protein kinase) This gene encodes a calcium/calmodulin-dependent serine protein kinase. The encoded protein is a MAGUK (membrane-associated guanylate kinase) protein family member. These proteins are scaffold proteins and the encoded protein is located at synapses in the brain. Mutations in this gene are associated with FG syndrome 4, intellectual disability and microcephaly with pontine and cerebellar hypoplasia, and a form of X-linked intellectual disability. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2017]

CASK Gene-Disease associations (from GenCC):

• FG syndrome 4

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• syndromic X-linked intellectual disability Najm type

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)
• X-linked syndromic intellectual disability

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

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 X-41524004-CAA-C is Pathogenic according to our data. Variant chrX-41524004-CAA-C is described in ClinVar as Pathogenic. ClinVar VariationId is 434586.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001367721.1. 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
	CASK	NM_001367721.1	MANE Select	c.2549_2550delTT	p.Phe850CysfsTer18	frameshift	Exon 26 of 27	NP_001354650.1
	CASK	NM_003688.4		c.2534_2535delTT	p.Phe845CysfsTer18	frameshift	Exon 26 of 27	NP_003679.2
	CASK	NM_001410745.1		c.2531_2532delTT	p.Phe844CysfsTer18	frameshift	Exon 25 of 26	NP_001397674.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CASK	ENST00000378163.7	TSL:5 MANE Select	c.2549_2550delTT	p.Phe850CysfsTer18	frameshift	Exon 26 of 27	ENSP00000367405.1
	CASK	ENST00000421587.8	TSL:1	c.2480_2481delTT	p.Phe827CysfsTer18	frameshift	Exon 24 of 25	ENSP00000400526.4
	CASK	ENST00000378166.9	TSL:1	c.2447_2448delTT	p.Phe816CysfsTer18	frameshift	Exon 24 of 25	ENSP00000367408.5

Frequencies

GnomAD3 genomes Cov.: 22

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 22

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Syndromic X-linked intellectual disability Najm type (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		8.6
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: rs1555972628; hg19: chrX-41383257;