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A Method for Detection of Somatic LINE-1 Insertions at the Single-Cell Level from Postmortem Human Brain
1Department of Molecular Brain Science, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan. bundo@kumamoto-u.ac.jp.
Methods in Molecular Biology (Clifton, N.J.)
|September 29, 2022
Summary
Researchers developed NECO-seq, a new method to pinpoint Long Interspersed Element-1 (LINE-1, L1) insertions in single human brain cells. This technique identifies novel L1Hs insertions, revealing genomic mosaicism in neural progenitor cells.
Area of Science:
- Genomics
- Neuroscience
- Molecular Biology
Background:
- Long Interspersed Element-1 (LINE-1, L1) retrotransposons can autonomously amplify within the genome.
- The human-specific active subtype, L1Hs, amplifies in neural progenitor cells, leading to genomic mosaicism.
- Understanding L1Hs insertion patterns is crucial for studying neural development and disease.
Purpose of the Study:
- To introduce NECO-seq (Novel Elements Concentrated-sequence), a novel method for single-cell level identification of L1Hs insertion loci.
- To enable precise mapping of novel somatic L1Hs insertions in postmortem human brain samples.
Main Methods:
- Preparation of neuronal cell nuclei from postmortem human brain tissue.
- Single neural nuclei whole genome amplification (snWGA) followed by SNP genotyping for quality control.
- Next-generation sequencing library preparation enriched for L1Hs insertion sites and subsequent bioinformatic analysis.
Main Results:
- The NECO-seq method successfully detects approximately 97% of L1Hs elements present in the reference human genome.
- The protocol identifies approximately 10-20 newly inserted L1Hs copies per neuronal cell in postmortem human brain samples.
- Demonstrates the capability to detect novel somatic L1Hs insertions at the single-cell level.
Conclusions:
- NECO-seq provides a powerful tool for investigating L1Hs-mediated genomic mosaicism in the human brain at single-cell resolution.
- This method facilitates the study of the impact of retrotransposon activity on neural progenitor cells and potential neurological conditions.
