A 73-year-old woman from Colombia had managed to stave of Alzheimer’s disease for decades, despite that she carried a genetic mutation that caused many in her family to develop dementia in middle age. But it was recently reported that she may carry another genetic mutation that may have protected her from early onset dementia. To find out more about what this means in the study of Alzheimer’s genetics is neurogeneticist Dr Azlina Ahmad Annuar.