chrX-41553894-C-T

Variant names:

• chrX-41553894-C-T
• rs1555980033
• NM_001367721.1:c.1864G>A

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001367721.1(CASK):​c.1864G>A​(p.Glu622Lys) variant causes a missense 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 23)
• Consequence: CASK NM_001367721.1 missense
• Clinical Significance: Not reported in ClinVar
• 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 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: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.818

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.1864G>A	p.Glu622Lys	missense	Exon 21 of 27	NP_001354650.1
	CASK	NM_003688.4		c.1864G>A	p.Glu622Lys	missense	Exon 21 of 27	NP_003679.2
	CASK	NM_001410745.1		c.1846G>A	p.Glu616Lys	missense	Exon 20 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.1864G>A	p.Glu622Lys	missense	Exon 21 of 27	ENSP00000367405.1
	CASK	ENST00000421587.8	TSL:1	c.1795G>A	p.Glu599Lys	missense	Exon 19 of 25	ENSP00000400526.4
	CASK	ENST00000378166.9	TSL:1	c.1777G>A	p.Glu593Lys	missense	Exon 19 of 25	ENSP00000367408.5

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 23

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.59
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.070
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.28	T
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.82	D
MetaSVM	Benign	-1.2	T
MutationAssessor	Benign	1.2	L
PhyloP100		7.6
PrimateAI	Pathogenic	0.92	D
PROVEAN	Uncertain	-2.7	D
REVEL	Uncertain	0.45
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Polyphen		0.79	P
Vest4		0.60
MutPred		0.75		Gain of methylation at E622 (P = 0.0037)
MVP		0.94
MPC		1.5
ClinPred		0.98	D
GERP RS		6.1
Varity_R		0.75
gMVP		0.94
Mutation Taster		=62/38	polymorphism

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: rs1555980033; hg19: chrX-41413147;