#de-novo-mutations

#de-novo-mutations

I recently met Billy, a 12-year-old boy with severe autism. He had been growing well but, at around age 3, he became increasingly delayed in speaking and walking. As he got older, he would frequently scream inconsolably when upset. and have temper tantrums and meltdowns, spilling and throwing food all around him, and difficulty understanding spoken language or learning. Eventually, testing showed that he had an IQ of 70-in the category of intellectual disability.