X-18628415-G-C

Variant names:

• chrX-18628415-G-C
• rs781774964
• NM_001323289.2:c.2541G>C

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001323289.2(CDKL5):​c.2541G>C​(p.Ser847Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000911 in 1,097,966 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. S847S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: CDKL5 NM_001323289.2 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.41
• 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_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP7: Synonymous conserved (PhyloP=-1.41 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKL5	NM_001323289.2	c.2541G>C	p.Ser847Ser	synonymous_variant	Exon 18 of 18	ENST00000623535.2	NP_001310218.1
CDKL5	NM_001037343.2	c.2541G>C	p.Ser847Ser	synonymous_variant	Exon 19 of 22		NP_001032420.1
CDKL5	NM_003159.3	c.2541G>C	p.Ser847Ser	synonymous_variant	Exon 18 of 21		NP_003150.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDKL5	ENST00000623535.2	c.2541G>C	p.Ser847Ser	synonymous_variant	Exon 18 of 18	1	NM_001323289.2	ENSP00000485244.1
CDKL5	ENST00000379989.6	c.2541G>C	p.Ser847Ser	synonymous_variant	Exon 19 of 22	1		ENSP00000369325.3
CDKL5	ENST00000379996.7	c.2541G>C	p.Ser847Ser	synonymous_variant	Exon 18 of 21	1		ENSP00000369332.3
CDKL5	ENST00000674046.1	c.2664G>C	p.Ser888Ser	synonymous_variant	Exon 19 of 19			ENSP00000501174.1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome AF: 9.11e-7 AC: 1 AN: 1097966 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 363322

African (AFR) AF: 0.00 AC: 0 AN: 26399

American (AMR) AF: 0.00 AC: 0 AN: 35207

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19384

East Asian (EAS) AF: 0.00 AC: 0 AN: 30206

South Asian (SAS) AF: 0.00 AC: 0 AN: 54140

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40533

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4134

European-Non Finnish (NFE) AF: 0.00000119 AC: 1 AN: 841871

Other (OTH) AF: 0.00 AC: 0 AN: 46092

GnomAD4 genome Cov.: 22

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.16
DANN	Benign	0.47
PhyloP100		-1.4

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs781774964; hg19: chrX-18646535;