By Bradley Jolly A mother is reassured despite her five-year-old son being diagnosed with an extremely rare, incurable disease. Kelly, who declined to give her surname, was despairing when son Oscar didn’t sit until nine months old, didn’t crawl until he was 12 months old, and struggled with communication. He saw a speech and language therapist, had physiotherapy and an MRI scan but Kelly and partner Mike remained in the dark for years. It wasn’t until a new NHS service diagnosed Oscar with Creatine Transporter Deficiency (CTD), which affects brain and muscle development. Genome sequencing tes…