X-18625241-G-T

Variant names:

• chrX-18625241-G-T
• rs1485485459
• NM_001323289.2:c.2490G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001323289.2(CDKL5):​c.2490G>T​(p.Gln830His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency: Genomes: not found (cov: 21)
• Consequence: CDKL5 NM_001323289.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.29
• Publications: 0 publications found

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]

CDKL5 Gene-Disease associations (from GenCC):

• CDKL5 disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• developmental and epileptic encephalopathy, 2

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• atypical Rett syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• infantile spasms

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• precocious puberty

  Inheritance: XL Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12942249).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001323289.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDKL5	NM_001323289.2	MANE Select	c.2490G>T	p.Gln830His	missense	Exon 17 of 18	NP_001310218.1	O76039-2
	CDKL5	NM_001037343.2		c.2490G>T	p.Gln830His	missense	Exon 18 of 22	NP_001032420.1	O76039-1
	CDKL5	NM_003159.3		c.2490G>T	p.Gln830His	missense	Exon 17 of 21	NP_003150.1	O76039-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDKL5	ENST00000623535.2	TSL:1 MANE Select	c.2490G>T	p.Gln830His	missense	Exon 17 of 18	ENSP00000485244.1	O76039-2
	CDKL5	ENST00000379989.6	TSL:1	c.2490G>T	p.Gln830His	missense	Exon 18 of 22	ENSP00000369325.3	O76039-1
	CDKL5	ENST00000379996.7	TSL:1	c.2490G>T	p.Gln830His	missense	Exon 17 of 21	ENSP00000369332.3	O76039-1

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 21

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	Benign	0.11
BayesDel_addAF	Benign	-0.070	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	13
DANN	Benign	0.95
DEOGEN2	Benign	0.022	T
FATHMM_MKL	Benign	0.56	D
LIST_S2	Benign	0.16	T
M_CAP	Pathogenic	0.40	D
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-0.95	T
MutationAssessor	Benign	1.1	L
PhyloP100		1.3
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-0.17	N
REVEL	Benign	0.27
Sift	Benign	0.069	T
Sift4G	Benign	0.45	T
Polyphen		0.016	B
Vest4		0.32
MutPred		0.046		Loss of MoRF binding (P = 0.1185)
MVP		0.91
MPC		0.45
ClinPred		0.13	T
GERP RS		1.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.15
gMVP		0.31
Mutation Taster		=95/5	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: rs1485485459; hg19: chrX-18643361;