chrX-18588079-T-G

Position:

• chrX-18588079-T-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001323289.2(CDKL5):​c.680T>G​(p.Leu227Arg) 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: CDKL5 NM_001323289.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 7.66

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 Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.969

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDKL5	NM_001323289.2	c.680T>G	p.Leu227Arg	missense_variant	9/18	ENST00000623535.2	NP_001310218.1
CDKL5	NM_001037343.2	c.680T>G	p.Leu227Arg	missense_variant	10/22		NP_001032420.1
CDKL5	NM_003159.3	c.680T>G	p.Leu227Arg	missense_variant	9/21		NP_003150.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDKL5	ENST00000623535.2	c.680T>G	p.Leu227Arg	missense_variant	9/18	1	NM_001323289.2	ENSP00000485244	P1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy, 2 Pathogenic:1

Likely pathogenic, no assertion criteria provided

curation

RettBASE

Mar 13, 2014

In silico prediction: SIFT = deleterious, MutationTaster = disease-causing, PolyPhen2 = probably damaging, AlignGVGD = pathogenic (C65) -

CDKL5 disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

curation

Centre for Population Genomics, CPG

Sep 09, 2024

This variant has been collected from RettBASE and curated to current modified ACMG/AMP criteria. Based on the classification scheme defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like Disorders Specifications to the ACMG/AMP Variant Interpretation Guidelines VCEP 3.0, this variant is classified as a variant of uncertain significance. At least the following criteria are met: This variant has been identified as a de novo occurrence in an individual with CDKL5 disorder without confirmation of paternity and maternity (PM6, PMID: 19793311). This variant is absent from gnomAD (PM2_Supporting). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.21	T;T;.;T;.;.
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.93	.;D;D;D;D;D
M_CAP	Pathogenic	0.36	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D;D
MetaSVM	Benign	-0.58	T
MutationAssessor	Uncertain	2.1	M;.;.;M;.;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-5.4	D;.;.;D;.;.
REVEL	Uncertain	0.63
Sift	Pathogenic	0.0	D;.;.;D;.;.
Sift4G	Pathogenic	0.0	D;.;.;D;D;D
Polyphen		1.0	D;.;.;D;.;.
Vest4		0.95
MutPred		0.93		Gain of solvent accessibility (P = 0.0365);Gain of solvent accessibility (P = 0.0365);Gain of solvent accessibility (P = 0.0365);Gain of solvent accessibility (P = 0.0365);Gain of solvent accessibility (P = 0.0365);Gain of solvent accessibility (P = 0.0365);
MVP		0.95
MPC		3.2
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.97
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs267608515; hg19: chrX-18606199;