rs1555971887

Variant names:

• chrX-41520444-C-T
• rs1555971887
• NM_001367721.1:c.2757G>A

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_001367721.1(CASK):​c.2757G>A​(p.Trp919*) variant causes a stop gained change involving the alteration of a 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 (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: CASK NM_001367721.1 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.57
• 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-AS1 (HGNC:40126): (CASK antisense RNA 1)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.00863 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-41520444-C-T is Pathogenic according to our data. Variant chrX-41520444-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 523767.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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CASK	NM_001367721.1	MANE Select	c.2757G>A	p.Trp919*	stop_gained	Exon 27 of 27	NP_001354650.1	O14936-1
	CASK	NM_003688.4		c.2742G>A	p.Trp914*	stop_gained	Exon 27 of 27	NP_003679.2	O14936-2
	CASK	NM_001410745.1		c.2739G>A	p.Trp913*	stop_gained	Exon 26 of 26	NP_001397674.1	A0A2R8YE77

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CASK	ENST00000378163.7	TSL:5 MANE Select	c.2757G>A	p.Trp919*	stop_gained	Exon 27 of 27	ENSP00000367405.1	O14936-1
	CASK	ENST00000421587.8	TSL:1	c.2688G>A	p.Trp896*	stop_gained	Exon 25 of 25	ENSP00000400526.4	A0A7I2RJN6
	CASK	ENST00000378166.9	TSL:1	c.2655G>A	p.Trp885*	stop_gained	Exon 25 of 25	ENSP00000367408.5	A0A2U3TZM4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	37
DANN	Uncertain	1.0
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		7.6
Vest4		0.65
GERP RS		5.8
Mutation Taster		=0/200	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: rs1555971887; hg19: chrX-41379697;