rs1555950468

Variant names:

• chrX-18588015-G-T
• rs1555950468
• NM_001323289.2:c.616G>T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3 PP5

The NM_001323289.2(CDKL5):​c.616G>T​(p.Asp206Tyr) 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: 9.60

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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.801
• PP5: Variant X-18588015-G-T is Pathogenic according to our data. Variant chrX-18588015-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 495246.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.616G>T	p.Asp206Tyr	missense_variant	Exon 9 of 18	ENST00000623535.2	NP_001310218.1
CDKL5	NM_001037343.2	c.616G>T	p.Asp206Tyr	missense_variant	Exon 10 of 22		NP_001032420.1
CDKL5	NM_003159.3	c.616G>T	p.Asp206Tyr	missense_variant	Exon 9 of 21		NP_003150.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDKL5	ENST00000623535.2	c.616G>T	p.Asp206Tyr	missense_variant	Exon 9 of 18	1	NM_001323289.2	ENSP00000485244.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 23

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Developmental and epileptic encephalopathy, 2 Pathogenic:1

Jan 01, 2018

NeuroMeGen, Hospital Clinico Santiago de Compostela

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Apr 06, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. 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 sequence change replaces aspartic acid, which is acidic and polar, with tyrosine, which is neutral and polar, at codon 206 of the CDKL5 protein (p.Asp206Tyr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of CDKL5-related conditions (PMID: 31780880). ClinVar contains an entry for this variant (Variation ID: 495246). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.16
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.20	T;T;.;T;.;.
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.97	.;D;D;D;D;D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.80	D;D;D;D;D;D
MetaSVM	Benign	-0.67	T
MutationAssessor	Benign	-0.14	N;.;.;N;.;N
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-8.8	D;.;.;D;.;.
REVEL	Uncertain	0.58
Sift	Uncertain	0.0030	D;.;.;D;.;.
Sift4G	Uncertain	0.0020	D;.;.;D;D;D
Polyphen		1.0	D;.;.;D;.;.
Vest4		0.90
MutPred		0.58		Gain of catalytic residue at D206 (P = 0.0118);Gain of catalytic residue at D206 (P = 0.0118);Gain of catalytic residue at D206 (P = 0.0118);Gain of catalytic residue at D206 (P = 0.0118);Gain of catalytic residue at D206 (P = 0.0118);Gain of catalytic residue at D206 (P = 0.0118);
MVP		0.95
MPC		2.8
ClinPred		1.0	D
GERP RS		6.1
Varity_R		0.98
gMVP		0.97

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: rs1555950468; hg19: chrX-18606135;