NM_001323289.2:c.91A>G

Variant names:

• chrX-18510846-A-G
• rs786204991
• NM_001323289.2:c.91A>G

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_001323289.2(CDKL5):​c.91A>G​(p.Arg31Gly) variant causes a missense change. 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 (★). Synonymous variant affecting the same amino acid position (i.e. R31R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: CDKL5 NM_001323289.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 4.27
• 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: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_001323289.2
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.858

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.91A>G	p.Arg31Gly	missense	Exon 3 of 18	NP_001310218.1	O76039-2
	CDKL5	NM_001037343.2		c.91A>G	p.Arg31Gly	missense	Exon 4 of 22	NP_001032420.1	O76039-1
	CDKL5	NM_003159.3		c.91A>G	p.Arg31Gly	missense	Exon 3 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.91A>G	p.Arg31Gly	missense	Exon 3 of 18	ENSP00000485244.1	O76039-2
	CDKL5	ENST00000379989.6	TSL:1	c.91A>G	p.Arg31Gly	missense	Exon 4 of 22	ENSP00000369325.3	O76039-1
	CDKL5	ENST00000379996.7	TSL:1	c.91A>G	p.Arg31Gly	missense	Exon 3 of 21	ENSP00000369332.3	O76039-1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1061552 Hom.: 0 Cov.: 24 AF XY: 0.00 AC XY: 0 AN XY: 332160

African (AFR) AF: 0.00 AC: 0 AN: 25756

American (AMR) AF: 0.00 AC: 0 AN: 35130

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19130

East Asian (EAS) AF: 0.00 AC: 0 AN: 29997

South Asian (SAS) AF: 0.00 AC: 0 AN: 53254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40016

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4015

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 809389

Other (OTH) AF: 0.00 AC: 0 AN: 44865

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	CDKL5 disorder (1)
1	-	-	Developmental and epileptic encephalopathy, 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.20	T
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.70	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Benign	-0.44	T
MutationAssessor	Pathogenic	3.0	M
PhyloP100		4.3
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-4.7	D
REVEL	Uncertain	0.45
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
Polyphen		0.99	D
Vest4		0.89
MutPred		0.72		Loss of stability (P = 0.0159)
MVP		0.97
MPC		2.4
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.98
gMVP		0.98
Mutation Taster		=4/96	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs786204991; hg19: chrX-18528966;