Cell type-specific genetic regulation of expression in the granule cell layer of the human dentate gyrus
2019
Laser capture microdissectionfollowed by
RNA-seq(LCM-seq) was used to profile the transcriptional landscape of the
granule celllayer of the
dentate gyrus(DG-GCL) in human
hippocampus, and contrasted to homogenate tissue. We identified widespread cell type-specific aging and genetic effects in the DG-GCL that were either missing or directionally discordant in corresponding bulk
hippocampus
RNA-seqdata from largely the same subjects. Of the ~9 million eQTLs in the DG-GCL, 15% were not in bulk
hippocampus, including 15 schizophrenia
genome-wide association study(GWAS) risk variants. We then created custom transcriptome-wide association study (TWAS) genetic weights from the DG-GCL which identified many novel schizophrenia-associated genetic signals not found in TWAS from bulk
hippocampus, including GRM3 and CACNA1C. These results highlight the biological resolution of cell type-specific expression profiling using targeted sampling strategies like LCM, and complement homogenate and single nuclei approaches in human brain.
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