Öz
Cyclin-dependent kinase-like 5 (CDKL5, OMIM 300203), also known as STK9 (serine/threonine kinase 9), is a gene that is thought to play a role in the production of proteins involved in the normal development of the brain, although its function is not known exactly. It is located in the p22.13 region of X chromosome. Some of the mutations reported in this gene have been found to be associated with epilepsy characterized with progressive seizures, non-epileptic autism and mild epilepsy phenotypes in infancy and early childhood despite treatment with at least two antiepileptic drugs (AED). In this study, we evaluated the relationship between c.119C>T (A40V) rs122460159, c.215T>A/C (I72N, I72T) rs62641235, c.455G>T (C152P) rs122460157, c.525A>T (R175S) rs61749700, c.533G>A (G178D) rs267606715, c.539C>T (P180L) rs61749704, c.1330C>T (R444C) rs561753977 and c.2635_2636delCT (L879E) rs61753251 polymorphisms in CDKL5 gene (NM_001323289) and intractable seizures and autism disorder. DNA extraction was performed after blood samples were collected. Identified mutations were analysed with Real-Time PCR method. The results obtained from the patient and control groups were compared. It was found that one female patient in the intractable seizure patient group carried the CDKL5 gene c.525 A>T p.(R175S) mutation, while one female patient in the intractable seizure patient group carried the c.539 C>T p.(P180L) mutation. It is thought that CDKL5 gene mutation research will be useful in the diagnosis of aetiology in new-borns that have intractable epilepsy despite AED treatment. The fact that CDKL5 mutant patients have autistic findings shows that this gene is among candidate genes for ASD, although no mutation was found in this patient group in our study.