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Whole-organism eQTL mapping at cellular resolution with single-cell sequencing.

Eyal Ben-David1,2, James Boocock1, Longhua Guo1

  • 1Department of Human Genetics, Department of Biological Chemistry, and Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, United States.

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Summary

We developed a novel single-cell RNA sequencing method to map expression quantitative trait loci (eQTLs) in the nematode Caenorhabditis elegans. This approach reveals cell-type and single-cell-specific eQTLs, offering new insights into gene regulation.

Keywords:
C. eleganscell-typeseqtlgeneticsgenomicsmappingrna-seqsingle-cell

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Area of Science:

  • Genetics
  • Genomics
  • Developmental Biology

Background:

  • Genetic regulation of gene expression influences complex traits and disease risk.
  • Studying cell-type-specific expression quantitative trait loci (eQTLs) is challenging in complex mammalian tissues.

Purpose of the Study:

  • To develop a novel, high-resolution method for mapping eQTLs across cell types.
  • To investigate cell-type and single-cell-specific eQTL effects in a model organism.

Main Methods:

  • Utilized single-cell RNA sequencing in a large population of genetically distinct Caenorhabditis elegans.
  • Developed a one-pot experimental approach for mapping eQTLs at cellular resolution.

Main Results:

  • Mapped eQTLs across multiple cell types, identifying cell-type-specific trans eQTL hotspots affecting core pathways.
  • Discovered single-cell-specific eQTL effects in the nervous system, including opposing effects in individual neurons.

Conclusions:

  • eQTL effects can be highly specific, extending down to the single-cell level.
  • The developed method enables cellular resolution mapping of eQTLs, advancing the study of gene regulation.