X-18650539-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BS1BP4BP2

This summary comes from the ClinGen Evidence Repository: The allele frequency of the p.Pro976Leu variant in CDKL5 is 0.01% in South Asian sub population in gnomAD, which is high enough to be classified as likely benign based on thresholds defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like conditions (BS1). The p.Pro976Leu variant is observed in the CDKL5 gene where a second pathogenic variant in the same gene is present in the patient (internal database) (BP2). Computational analysis prediction tools suggest that the p.Pro976Leu variant does not have a deleterious impact; however this information does not predict clinical significance on its own (BP4). In summary, the p.Pro976Leu variant in CDKL5 is classified as likely benign based on the ACMG/AMP criteria (BS1, BP2, BP4). LINK:https://erepo.genome.network/evrepo/ui/classification/CA171640/MONDO:0100039/016

Frequency

Genomes: 𝑓 0.000027 ( 0 hom., 0 hem., cov: 24)

Exomes 𝑓: 0.000039 ( 0 hom. 17 hem. )

Consequence

CDKL5
ENST00000379989.6 missense

Scores

Clinical Significance

Likely benign reviewed by expert panel B:7

Conservation

PhyloP100: -0.140

Publications

1 publications found

Variant links:

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 links:

RS1 (HGNC:10457): (retinoschisin 1) This gene encodes an extracellular protein that plays a crucial role in the cellular organization of the retina. The encoded protein is assembled and secreted from photoreceptors and bipolar cells as a homo-oligomeric protein complex. Mutations in this gene are responsible for X-linked retinoschisis, a common, early-onset macular degeneration in males that results in a splitting of the inner layers of the retina and severe loss in vision. [provided by RefSeq, Oct 2008]

RS1 Gene-Disease associations (from GenCC):

retinoschisis
Inheritance: XL Classification: DEFINITIVE Submitted by: G2P
X-linked retinoschisis
Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), Myriad Women’s Health, ClinGen

RS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP2

For more information check the summary or visit ClinGen Evidence Repository.

BP4

For more information check the summary or visit ClinGen Evidence Repository.

BS1

For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000379989.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
RS1	NM_000330.4	MANE Select	c.185-3207G>A		intron	N/A	NP_000321.1
CDKL5	NM_001037343.2		c.2927C>T	p.Pro976Leu	missense	Exon 21 of 22	NP_001032420.1
CDKL5	NM_003159.3		c.2927C>T	p.Pro976Leu	missense	Exon 20 of 21	NP_003150.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CDKL5	ENST00000379989.6	TSL:1	c.2927C>T	p.Pro976Leu	missense	Exon 21 of 22	ENSP00000369325.3
CDKL5	ENST00000379996.7	TSL:1	c.2927C>T	p.Pro976Leu	missense	Exon 20 of 21	ENSP00000369332.3
RS1	ENST00000379984.4	TSL:1 MANE Select	c.185-3207G>A		intron	N/A	ENSP00000369320.3

Frequencies

GnomAD3 genomes

AF:

0.0000267

AC:

AN:

112533

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000563

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000436

AC:

AN:

183387

AF XY:

0.0000295

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000733

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000392

AC:

AN:

1098034

Hom.:

Cov.:

AF XY:

0.0000468

AC XY:

AN XY:

363392

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26398

American (AMR)

AF:

0.00

AC:

AN:

35207

Ashkenazi Jewish (ASJ)

AF:

0.0000516

AC:

AN:

19386

East Asian (EAS)

AF:

0.00

AC:

AN:

30203

South Asian (SAS)

AF:

0.0000923

AC:

AN:

54147

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40508

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4136

European-Non Finnish (NFE)

AF:

0.0000416

AC:

AN:

841957

Other (OTH)

AF:

0.0000434

AC:

AN:

46092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.487

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000267

AC:

AN:

112533

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34705

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30973

American (AMR)

AF:

0.00

AC:

AN:

10660

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2653

East Asian (EAS)

AF:

0.00

AC:

AN:

3582

South Asian (SAS)

AF:

0.00

AC:

AN:

2732

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6216

Middle Eastern (MID)

AF:

0.00

AC:

AN:

239

European-Non Finnish (NFE)

AF:

0.0000563

AC:

AN:

53276

Other (OTH)

AF:

0.00

AC:

AN:

1514

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.558

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000391

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.0000412

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000178

ClinVar

Significance: Likely benign

Submissions summary: Benign:7

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not specified

Benign:3

May 15, 2014

RettBASE

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:curation

In exon 20, only affects original isoforms; In silico prediction: SIFT = tolerated, MutationTaster = polymorphism, PolyPhen2 = benign, AlignGVGD = benign (C0)

Oct 09, 2017

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.

Aug 28, 2018

Genetic Services Laboratory, University of Chicago

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

CDKL5 disorder

Benign:2

Jul 22, 2024

Centre for Population Genomics, CPG

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:curation

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 likely benign. At least the following criteria are met: The allele frequency of this variant in at least one population in gnomAD is between 0.008% and 0.03% (BS1). Computational prediction analysis tools suggest no impact on gene product (REVEL score <= 0.15) (BP4).

Mar 26, 2021

ClinGen Rett and Angelman-like Disorders Variant Curation Expert Panel

Significance:Likely benign

Review Status:reviewed by expert panel

Collection Method:curation

The allele frequency of the p.Pro976Leu variant in CDKL5 is 0.01% in South Asian sub population in gnomAD, which is high enough to be classified as likely benign based on thresholds defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like conditions (BS1). The p.Pro976Leu variant is observed in the CDKL5 gene where a second pathogenic variant in the same gene is present in the patient (internal database) (BP2). Computational analysis prediction tools suggest that the p.Pro976Leu variant does not have a deleterious impact; however this information does not predict clinical significance on its own (BP4). In summary, the p.Pro976Leu variant in CDKL5 is classified as likely benign based on the ACMG/AMP criteria (BS1, BP2, BP4).

not provided

Benign:1

Jun 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

CDKL5: BP4, BS2

Developmental and epileptic encephalopathy, 2;CN128785:Angelman syndrome-like

Benign:1

Oct 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Benign

-0.53

BayesDel_noAF

Benign

-0.79

CADD

Benign

0.84

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.031

FATHMM_MKL

Benign

0.012

LIST_S2

Benign

0.47

M_CAP

Pathogenic

0.38

MetaRNN

Benign

0.052

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.0

PhyloP100

-0.14

PrimateAI

Benign

0.28

PROVEAN

Benign

-0.49

REVEL

Benign

0.11

Sift

Benign

0.38

Sift4G

Pathogenic

0.0

Polyphen

0.0

Vest4

0.030

MutPred

0.41

Gain of sheet (P = 0.0016)

MVP

0.14

MPC

0.88

ClinPred

0.062

GERP RS

-2.2

Varity_R

0.028

gMVP

0.31

Mutation Taster

=100/0

polymorphism

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over