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A rare case of cdkl5 early infantile epileptic
1. A Rare Case of CDKL5 Early
Infantile Epileptic Encephalopathy- 2
Dr Pramod Krishnan,
Department of Neurology,
Manipal Hospital, Bengaluru.
2. Introduction
• Early infantile epileptic encephalopathy-2 (EIEE-2) also known as X-
linked dominant infantile spasm syndrome-2 is caused by mutations in
the cyclin-dependent kinase-like 5 (CDKL5) gene.
• We present the electro-clinical phenotype of the first patient with
CDKL5 related EIEE-2 reported from India.
• Initially, it was thought to be a seizure onset variant of Retts syndrome.
• There is phenotypic variation, and therefore ‘CDKL5 disorder’ is now
used to describe this group of disorders.
Fehr H, Leonard H, Ho G, et al. Journal of Neurodevelopmental disorders 2015; 7:2.
3. Clinical features
• A 2-year-old female child with normal birth history, and non-
consanguineous parentage presented with recurrent generalised febrile
seizures since the age of 6 weeks.
• She developed daily clusters of epileptic spasms since 3 months of age.
• She was treated with ACTH, valproate and lamotrigine and these
spasms reduced by 6 months of age.
• Significant development lag, regression of milestones and motor
hypotonia was noted by this time.
4. Clinical features
• From the age of 6 months she had frequent generalised tonic, tonic
clonic seizures along with spasms, refractory to multiple AEDs,
cannabinoids and ketogenic diet.
• EEG showed disorganised background activity, generalised fast activity,
generalised and multifocal epileptiform discharges.
• MRI brain and blood investigations were unremarkable.
5. EEG bipolar montage showing generalised spike wave discharges and poorly formed background activity.
7. Genetic test
• A heterozygous 3’ splice site variation in intron 5 of the CDKL5 gene
(chrX:18593473; G>G/A; Depth: 122x) that affects the invariant AG
acceptor splice site of exon 6 (c.146-1G>G/A; ENST00000379989) was
detected.
• This variant was not detected in both parents.
• This CDKL5 variant has not been reported in both the 1000 genomes
and ExAC databases.
• The in silico prediction of the variant is damaging by Mutation Taster 2
Liang JS, Shimojima K, Takayama R, et al. Epilepsia. 2011;52:1835–42.
8. Discussion
• EIEE-2 is an X-linked dominant severe neurologic disorder
characterized by seizure onset in the first months of life and severe
global developmental delay resulting in mental retardation and poor
motor control.
• Other features include poor language development, subtle dysmorphic
facial features, sleep disturbances, gastrointestinal problems and
stereotypic hand movements.
• There is some phenotypic overlap with Rett syndrome, but early
infantile epileptic encephalopathy-2 is considered to be a distinct entity.
Jähn J, Caliebe A, von Spiczak S, et al. J Child Neurol. 2013;28:937–41.
9. Conclusion
• CDKL5 mutations are a rare cause of early infantile epileptic
encephalopathy and has not been reported from India.
• It is characterized by intractable epilepsy and severe mental retardation,
followed later by the development of Rett syndrome like features.
• Long term prognosis for normal development is poor.
• No clear genotype-phenotype correlation has been identified.
• Genetic testing in children with typical phenotype is recommended.