NM_001367721.1:c.2767T>A

Variant names:

• chrX-41520434-A-T
• rs1292052935
• NM_001367721.1:c.2767T>A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP2 BS2

The NM_001367721.1(CASK):​c.2767T>A​(p.Ser923Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000731 in 1,094,452 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 2 hemizygotes in GnomAD. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000073 (0 hom. 2 hem.)
• Consequence: CASK NM_001367721.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.95

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

Verdict is Likely_benign. Variant got -3 ACMG points.

• PP2: Missense variant in the CASK gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 30 curated pathogenic missense variants (we use a threshold of 10). The gene has 23 curated benign missense variants. Gene score misZ: 4.2502 (above the threshold of 3.09). GenCC associations: The gene is linked to syndromic X-linked intellectual disability Najm type, X-linked syndromic intellectual disability, developmental and epileptic encephalopathy, FG syndrome 4.
• BS2: High Hemizygotes in GnomAdExome4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CASK	NM_001367721.1	c.2767T>A	p.Ser923Thr	missense_variant	Exon 27 of 27	ENST00000378163.7	NP_001354650.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CASK	ENST00000378163.7	c.2767T>A	p.Ser923Thr	missense_variant	Exon 27 of 27	5	NM_001367721.1	ENSP00000367405.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD3 exomes AF: 0.00000551 AC: 1 AN: 181637 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 66169

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000366

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000731 AC: 8 AN: 1094452 Hom.: 0 Cov.: 28 AF XY: 0.00000555 AC XY: 2 AN XY: 360074

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000284

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: 0.00000834

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual disability, CASK-related, X-linked Uncertain:1

Dec 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces serine, which is neutral and polar, with threonine, which is neutral and polar, at codon 918 of the CASK protein (p.Ser918Thr). This variant is present in population databases (no rsID available, gnomAD 0.004%). This variant has not been reported in the literature in individuals affected with CASK-related conditions. ClinVar contains an entry for this variant (Variation ID: 1964785). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt CASK protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Uncertain	0.026	T
BayesDel_noAF	Benign	-0.090
CADD	Uncertain	24
DANN	Benign	0.93
DEOGEN2	Uncertain	0.45	.;.;.;.;.;.;.;T;.;.;.;.;.;.
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D;D;D;D;D;D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.34	D
MetaRNN	Uncertain	0.51	D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	-0.28	T
MutationAssessor	Benign	1.5	.;.;.;.;.;.;.;L;.;.;.;.;.;.
PrimateAI	Pathogenic	0.79	T
PROVEAN	Benign	-1.9	.;.;.;.;.;N;.;N;.;.;.;.;.;.
REVEL	Benign	0.19
Sift	Benign	0.12	.;.;.;.;.;T;.;T;.;.;.;.;.;.
Sift4G	Benign	0.11	.;.;.;.;.;T;.;T;.;.;.;.;.;.
Polyphen		0.98	D;B;.;P;.;P;.;P;.;.;.;.;.;.
Vest4		0.46
MutPred		0.42		.;.;.;.;.;.;.;Loss of disorder (P = 0.0306);.;.;.;.;.;.;
MVP		0.90
MPC		1.5
ClinPred		0.49	T
GERP RS		5.8
Varity_R		0.40
gMVP		0.64

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

Publications

LitVar

Other links and lift over

dbSNP: rs1292052935; hg19: chrX-41379687;