Objective: To explore the genetic basis of a patient featuring global developmental delay, intellectual disability, cleft palate, seizures and hypotonia.
Methods: Clinical examination and laboratory tests were carried out. Peripheral blood samples were obtained from the patient and his parents. Whole genomic DNA was extracted and subjected to next generation sequencing. Candidate variation was analyzed by using bioinformatic software and validated by Sanger sequencing.
Results: The proband was found to carry a heterozygous c.2117T>C (p.Leu706Pro) variant of the NEDD4L gene, which was a de novo variant validated by Sanger sequencing and predicted to be likely pathogenic according to the American College of Medical Genetics Guidelines.
Conclusion: The heterozygous variant of c.2117T>C (p.Leu706Pro) of the NEDD4L gene probably underlies the disorders in the patient.