Overlaps in biological pathways, clinical features and behavioural expression Although Alzheimer’s disease (AD) and ASD are etiologically distinct conditions , there is growing evidence of significant overlaps in biological and neurological features, and behavioural expression of ASD and AD (and related dementias). Studies also suggest that there are common neurological pathways in both ASD and dementia, particularly involving the immune system and synaptic signaling. A gene