X-18650520-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BS1BS2

This summary comes from the ClinGen Evidence Repository: RS1(NM_000330.4) and an alternative transcript of CDKL5 (NM_003159.2) are overlapping transcripts; however, these variants are in the noncoding 3' region of the main CDKL5 transcript (NM_001323289.2). The allele frequency of the c.2908C>T (p.Arg970Ter) variant in CDKL5 transcript (NM_003159.2) is 0.02285% in the Middle Eastern sub population in gnomAD v4, which is high enough to meet the BS1 criteria based on thresholds defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like conditions (BS1). The p.Arg970Ter variant in CDKL5 has been reported in an individual with a clinical phenotype suggestive of CDKL5 disorder (PMID 19428276), however this criterion cannot be applied due the allele frequency of the variant in gnomAD (PP4 not met). The p.Arg970Ter is observed in at least 5 unaffected individuals (internal database - GeneDx). In summary, the p.Arg970Ter variant in CDKL5 is classified as Benign based on the ACMG/AMP criteria (BS1, BS2). LINK:https://erepo.genome.network/evrepo/ui/classification/CA170485/MONDO:0100039/034

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 1 hem., cov: 23)

Exomes 𝑓: 0.000026 ( 0 hom. 9 hem. )

Consequence

CDKL5
NM_003159.3 stop_gained

Scores

Clinical Significance

Benign reviewed by expert panel U:2B:4

Conservation

PhyloP100: 0.290

Publications

9 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: Myriad Women’s Health, PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, Orphanet

RS1 links:

Genome browser will be placed here

ACMG classification

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

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BS1

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

BS2

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003159.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
RS1	NM_000330.4	MANE Select	c.185-3188G>A		intron	N/A	NP_000321.1	O15537
CDKL5	NM_001037343.2		c.2908C>T	p.Arg970*	stop_gained	Exon 21 of 22	NP_001032420.1	O76039-1
CDKL5	NM_003159.3		c.2908C>T	p.Arg970*	stop_gained	Exon 20 of 21	NP_003150.1	O76039-1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CDKL5	ENST00000379989.6	TSL:1	c.2908C>T	p.Arg970*	stop_gained	Exon 21 of 22	ENSP00000369325.3	O76039-1
CDKL5	ENST00000379996.7	TSL:1	c.2908C>T	p.Arg970*	stop_gained	Exon 20 of 21	ENSP00000369332.3	O76039-1
RS1	ENST00000379984.4	TSL:1 MANE Select	c.185-3188G>A		intron	N/A	ENSP00000369320.3	O15537

Frequencies

GnomAD3 genomes

AF:

0.0000178

AC:

AN:

112511

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000188

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000109

AC:

AN:

183458

AF XY:

0.0000147

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:

0.0000244

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000255

AC:

AN:

1097954

Hom.:

Cov.:

AF XY:

0.0000248

AC XY:

AN XY:

363314

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26397

American (AMR)

AF:

0.00

AC:

AN:

35207

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19383

East Asian (EAS)

AF:

0.0000331

AC:

AN:

30202

South Asian (SAS)

AF:

0.0000554

AC:

AN:

54141

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40523

Middle Eastern (MID)

AF:

0.000242

AC:

AN:

4137

European-Non Finnish (NFE)

AF:

0.0000261

AC:

AN:

841881

Other (OTH)

AF:

0.0000217

AC:

AN:

46083

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.454

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:

0.0000178

AC:

AN:

112511

Hom.:

Cov.:

AF XY:

0.0000288

AC XY:

AN XY:

34681

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30963

American (AMR)

AF:

0.000188

AC:

AN:

10666

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2654

East Asian (EAS)

AF:

0.00

AC:

AN:

3592

South Asian (SAS)

AF:

0.00

AC:

AN:

2728

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6206

Middle Eastern (MID)

AF:

0.00

AC:

AN:

239

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

53259

Other (OTH)

AF:

0.00

AC:

AN:

1518

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000819

Hom.:

Bravo

AF:

0.00000756

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000346

AC:

ExAC

AF:

0.00000824

AC:

ClinVar

ClinVar submissions

Significance:Benign

Revision:reviewed by expert panel

View on ClinVar

Pathogenic

VUS

Benign

Condition

CDKL5 disorder (2)

Atypical Rett syndrome (1)

Developmental and epileptic encephalopathy, 2;CN128785:Angelman syndrome-like (1)

not provided (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.28

BayesDel_noAF

Pathogenic

0.21

CADD

Pathogenic

(source)

DANN

Benign

0.94

FATHMM_MKL

Benign

0.0095

PhyloP100

0.29

Vest4

0.52

GERP RS

0.69

Mutation Taster

=30/170

disease causing (fs/PTC)

(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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over