Order to confirm the clinical diagnosis of a CDKL5 mutation-related disorder (eg, infantile spasm syndrome or MECP2-negative atypical Rett syndrome).
- Patient Preparation
- Lavender (EDTA), pink (K2EDTA), or yellow (ACD Solution A or B).
- Specimen Preparation
- Transport 3 mL whole blood. (Min: 1 mL)
- Storage/Transport Temperature
- Unacceptable Conditions
- Ambient: 72 hours; Refrigerated: 1 week; Frozen: Unacceptable
Characteristics: Vary widely but may include early onset intractable seizures, severe developmental delay, with females often exhibiting features of Rett syndrome.
Incidence: Unknown; more frequent in females than males.
Inheritance: X-linked dominant; reported cases are de novo.
Penetrance: 100 percent.
Cause: Pathogenic CDKL5 gene mutations.
Clinical Sensitivity: Approximately 17 percent in females with infantile spasms/seizures.
Methodology: Bidirectional sequencing of theCDKL5 coding region and intron-exon boundaries.
Analytical Sensitivity and Specificity: 99 percent.
Limitations: Diagnostic errors can occur due to rare sequence variations. Regulatory region mutations, deep intronic mutations, and large deletions/duplications will not be detected.
Counseling and informed consent are recommended for genetic testing. Consent forms are available online.
|Component Test Code*||Component Chart Name||LOINC|
|2004932||CDKL5-Related Disorders Seq Specimen|
|2004933||CDKL5-Related Disorders Seq Interp|
- Atypical Rett
- Epileptic Encehpalopathy, Early Infantile 2
- Infantile Spasms/Atypical Rett
- Rett-like Syndrome