chrX-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. The gene CDKL5 is included in the ClinGen Criteria Specification Registry.

• 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

Specifications for CDKL5 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

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;