X-18598499-C-G

Variant names:

• chrX-18598499-C-G
• NM_001323289.2:c.863C>G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_001323289.2(CDKL5):​c.863C>G​(p.Thr288Arg) 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. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 23)
• Consequence: CDKL5 NM_001323289.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 7.38

Genes affected

CDKL5 (HGNC:11411): (cyclin dependent kinase like 5) This gene is a member of Ser/Thr protein kinase family and encodes a phosphorylated protein with protein kinase activity. Mutations in this gene have been associated with X-linked infantile spasm syndrome (ISSX), also known as X-linked West syndrome, and Rett syndrome (RTT). Alternate transcriptional splice variants have been characterized. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.911
• PP5: Variant X-18598499-C-G is Pathogenic according to our data. Variant chrX-18598499-C-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 1879751.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKL5	NM_001323289.2	c.863C>G	p.Thr288Arg	missense_variant	Exon 11 of 18	ENST00000623535.2	NP_001310218.1
CDKL5	NM_001037343.2	c.863C>G	p.Thr288Arg	missense_variant	Exon 12 of 22		NP_001032420.1
CDKL5	NM_003159.3	c.863C>G	p.Thr288Arg	missense_variant	Exon 11 of 21		NP_003150.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDKL5	ENST00000623535.2	c.863C>G	p.Thr288Arg	missense_variant	Exon 11 of 18	1	NM_001323289.2	ENSP00000485244.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 23

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:1

Apr 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

CDKL5: PM2, PM5, PS2:Moderate -

Developmental and epileptic encephalopathy, 2;CN128785:Angelman syndrome-like Uncertain:1

Nov 27, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with arginine, which is basic and polar, at codon 288 of the CDKL5 protein (p.Thr288Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with epileptic encephalopathy (Invitae). ClinVar contains an entry for this variant (Variation ID: 1879751). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CDKL5 protein function. This variant disrupts the p.Thr288 amino acid residue in CDKL5. Other variant(s) that disrupt this residue have been observed in individuals with CDKL5-related conditions (PMID: 18809835; Invitae), which suggests that this may be a clinically significant amino acid residue. 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	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.32
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.19	T;T;.;T;.;.
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.97	.;D;D;D;D;D
M_CAP	Pathogenic	0.90	D
MetaRNN	Pathogenic	0.91	D;D;D;D;D;D
MetaSVM	Uncertain	-0.16	T
MutationAssessor	Benign	1.5	L;.;.;L;.;L
PrimateAI	Uncertain	0.76	T
PROVEAN	Uncertain	-3.1	D;.;.;D;.;.
REVEL	Pathogenic	0.65
Sift	Uncertain	0.0020	D;.;.;D;.;.
Sift4G	Uncertain	0.047	D;.;.;D;T;D
Polyphen		1.0	D;.;.;D;.;.
Vest4		0.96
MutPred		0.75		Loss of phosphorylation at T288 (P = 0.0506);Loss of phosphorylation at T288 (P = 0.0506);Loss of phosphorylation at T288 (P = 0.0506);Loss of phosphorylation at T288 (P = 0.0506);Loss of phosphorylation at T288 (P = 0.0506);Loss of phosphorylation at T288 (P = 0.0506);
MVP		0.94
MPC		0.65
ClinPred		0.96	D
GERP RS		5.5
Varity_R		0.99
gMVP		0.95

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-18616619;