Peptide-centric proteomics reveals molecular subtypes of sporadic Alzheimer's disease

Two distinct sporadic Alzheimer’s disease phenotypes are indicated by correlated peptide abundance differences mapping to A-beta and tau in the superior and medial temporal gyrus.

• Why it matters: Sporadic AD has uncertain etiology and is often confounded by comorbid pathology, limiting clear molecular subtype discovery.
• What they did: Using quantitative mass spectrometry on a brain sample set without neuropathologic comorbidities, the study quantified peptides mapping to A-beta and tau across resilient-to-AD and dementia groups.
• The result: Peptide-level differences also distinguish sporadic AD dementia from autosomal dominant AD dementia in the inferior parietal lobe and caudate nucleus, revealing shared and distinct molecular features by cause and onset.

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