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Intellectual disability

Gene: CDK8

Green List (high evidence)

CDK8 (cyclin dependent kinase 8)
EnsemblGeneIds (GRCh38): ENSG00000132964
EnsemblGeneIds (GRCh37): ENSG00000132964
OMIM: 603184, Gene2Phenotype
CDK8 is in 3 panels

5 reviews

Louise Daugherty (Genomics England Curator)

Comment on list classification: Changed from Red to Green. Appropriate phenotype, sufficient cases and external expert review all support gene-disease association and relevance to this panel to rate gene as Green.
Created: 2 Apr 2019, 10:22 a.m.

Konstantinos Varvagiannis (Other)

Green List (high evidence)

Calpena et al. (2019 - PMID: 30905399 - DDD study among the co-authors) report on 12 unrelated individuals with pathogenic CDK8 missense variants.

Common features included hypotonia and DD (universal feature). Older children displayed variable degrees of ID (2 mild, 5 moderate, 2 moderate-severe). Other features included feeding difficulties, behavioral disorders, CHD, epilepsy (2 individuals), impaired vision and hearing problems in few.

CDK8 (alternatively CDK19) serves a one of the four subunits of a kinase module that reversibly binds to the mediator complex to regulate its activity (in turn, regulation of transcription). Mutations in other genes coding for the 3 other subunits of the kinase module (eg. MED12 or MED13L) lead to syndromic neurodevelopmental disorders.

8 missense CDK8 variants were reported in total. Ser62Leu (NM_001260.2:c.185C>T) was recurrent, observed in 5 subjects. The variants had occurred as de novo events in all cases (10 individuals) where parental samples were available.

All variants clustered in the kinase domain (residues 21-335 - of 464 total) around the ATP binding pocket. A thermal stability assay did not reveal gross protein instability in the presence or absence of ATP while the ability to bind ATP was retained for most/all variants. Study of STAT1 phosphorylation was suggestive of attenuated kinase activity for all variants, though to a lesser degree for 2 of them. Given the type of variants (all missense) and the pLI of 0.38 haploinsufficiency appears to be unlikely. A dominant-negative mechanism is favoured.

CDK8 is not associated with any phenotype in G2P.

As a result, CDK8 can be considered for upgrade to green or amber (if the degree of ID is relevant for the current panel).
Created: 27 Mar 2019, 3:30 p.m.

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown

Phenotypes
Generalized hypotonia; Feeding difficulties; Global developmental delay; Intellectual disability; Behavioral abnormality; Abnormality of cardiovascular system morphology; Hearing impairment; Abnormality of vision; Anorectal anomaly; Seizures

Publications

Mode of pathogenicity
Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments

Sarah Leigh (Genomics England Curator)

Red List (low evidence)

Not associated with phenotype in OMIM or G2P. Reported as a candidate gene in PMID 26350204
Created: 15 Dec 2017, 9:38 a.m.

Mode of inheritance
Unknown

Publications

Caroline Wright (Sanger)

Red List (low evidence)

Lu Raymond (university of cambridge )

Red List (low evidence)

Details

Mode of Inheritance
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Sources
Phenotypes
  • Generalized hypotonia
  • Feeding difficulties
  • Global developmental delay
  • Intellectual disability
  • Behavioral abnormality
  • Abnormality of cardiovascular system morphology
  • Hearing impairment
  • Abnormality of vision
  • Anorectal anomaly
  • Seizures
  • Intellectual developmental disorder with hypotonia and behavioral abnormalities #618748
OMIM
603184
Clinvar variants
Variants in CDK8
Penetrance
Complete
Publications
Panels with this gene

History Filter Activity

11 May 2020, Gel status: 3

Set Phenotypes

Eleanor Williams (Genomics England Curator)

Phenotypes for gene: CDK8 were changed from Generalized hypotonia; Feeding difficulties; Global developmental delay; Intellectual disability; Behavioral abnormality; Abnormality of cardiovascular system morphology; Hearing impairment; Abnormality of vision; Anorectal anomaly; Seizures to Generalized hypotonia; Feeding difficulties; Global developmental delay; Intellectual disability; Behavioral abnormality; Abnormality of cardiovascular system morphology; Hearing impairment; Abnormality of vision; Anorectal anomaly; Seizures; Intellectual developmental disorder with hypotonia and behavioral abnormalities #618748

2 Apr 2019, Gel status: 3

Set Phenotypes

Louise Daugherty (Genomics England Curator)

Phenotypes for gene: CDK8 were changed from to Generalized hypotonia; Feeding difficulties; Global developmental delay; Intellectual disability; Behavioral abnormality; Abnormality of cardiovascular system morphology; Hearing impairment; Abnormality of vision; Anorectal anomaly; Seizures

2 Apr 2019, Gel status: 3

Entity classified by Genomics England curator

Louise Daugherty (Genomics England Curator)

Gene: cdk8 has been classified as Green List (High Evidence).

2 Apr 2019, Gel status: 1

Set publications

Louise Daugherty (Genomics England Curator)

Publications for gene: CDK8 were set to 26350204; 24139904

2 Apr 2019, Gel status: 1

Set mode of inheritance

Louise Daugherty (Genomics England Curator)

Mode of inheritance for gene: CDK8 was changed from Unknown to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown

12 Mar 2018, Gel status: 1

Panel promoted to version 2.0

Ellen McDonagh (Genomics England Curator)

12.03.2018: Due to major updates completed (Phase 1, 2 and 3), this panel was promoted to Version 2 in order to reflect the major updates since November 2017 which have resulted in reviews for 836 genes added by Genomics England Curators and the Clinical Team, 130 new Green genes added to the interpretation pipeline (from 751 to 881 Green genes), and the gene total has increased from 1879 to 1927.

5 Jan 2018, Gel status: 1

Set mode of inheritance, Set publications

Ellen McDonagh (Genomics England Curator)

Model of inheritance for gene CDK8 was set to Unknown Publications for gene CDK8 was set to ['26350204', ' 24139904']

13 Nov 2015, Gel status: 1

gel status update

GEL ()

The Gel status was updated for this whole panel

13 Nov 2015, Gel status: 2

gel status update

GEL ()

The Gel status was updated for this whole panel

13 Nov 2015, Gel status: 0

Added New Source

Ellen McDonagh (Genomics England Curator)

CDK8 was added to Intellectual disabilitypanel. Sources: Expert Review Red

13 Nov 2015, Gel status: 0

Created

Ellen McDonagh (Genomics England Curator)

CDK8 was created by ellenmcdonagh