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Basic Science and Pathogenesis.

Feixiong Cheng1, Yayan Feng2, Margaret E Flanagan3,4

  • 1Cleveland Clinic Genome Center, Cleveland, OH, USA.

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Summary
This summary is machine-generated.

Single-nucleus multiome profiling of the cerebellum reveals novel regulatory insights into Alzheimer's disease (AD) and AD-related dementias (ADRD). This study identified disease-associated cell subpopulations and potential causal genes, advancing our understanding of AD neuropathology.

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Area of Science:

  • Neuroscience
  • Genomics
  • Epigenetics

Background:

  • Single-cell/nuclei multiome technologies enable simultaneous gene expression and chromatin accessibility profiling.
  • This approach allows for cell type-specific investigation of regulatory mechanisms underlying Alzheimer's disease (AD).

Purpose of the Study:

  • To investigate the regulatory underpinnings of AD/ADRD in the human cerebellum using single-nucleus multiome sequencing.
  • To identify cell type-specific transcriptomic and epigenomic features associated with AD neuropathology in the cerebellum.

Main Methods:

  • Conducted single-nucleus RNA sequencing (snRNA-seq) and single-nucleus assay for transposase-accessible chromatin sequencing (snATAC-seq) on postmortem human cerebellum and frontal cortex tissues.
  • Utilized colocalization and fine-mapping to identify likely causal target genes in AD/ADRD cerebellum.
  • Integrated snATAC-seq, genome-wide AD/ADRD loci, and Hi-C looping data for causal gene identification.

Main Results:

  • Analyzed 103,861 nuclei from human cerebellum and frontal cortex, identifying disease-associated granule cell subpopulations in AD/ADRD.
  • Discovered 431,834 significant linkages between gene expression and cell subtype-specific chromatin accessibility regions (cCREs).
  • Identified key regulatory elements and transcription factors (e.g., RORA, ELF1) and two likely causal genes (SEZ6L2, KANSL1) in cerebellar cells.

Conclusions:

  • This study provides a comprehensive, cell subtype-specific regulatory landscape of the human cerebellum in AD/ADRD.
  • Offers novel genomic and epigenomic insights into AD/ADRD neuropathology and pathobiology.
  • Highlights the potential for broader application in understanding other neurological disorders.