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Updated: Sep 2, 2025

Characterizing Mutational Load and Clonal Composition of Human Blood
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Diverse mutational landscapes in human lymphocytes.

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Normal lymphocytes accumulate more mutations than stem cells due to programmed and off-target genome changes during differentiation and immune responses. These mutation patterns in healthy B cells resemble those in B-cell cancers.

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Area of Science:

  • Genomics
  • Immunology
  • Cancer Biology

Background:

  • Lymphocyte genomes face constant threats from programmed mutation, proliferation, and environmental factors.
  • Understanding the genomic landscape of normal lymphocytes is crucial for deciphering lymphocyte-related diseases.

Purpose of the Study:

  • To comprehensively analyze whole-genome mutations in various normal lymphocyte subsets and compare them to hematopoietic stem cells.
  • To identify the sources and burdens of mutations, including off-target effects of immune processes and environmental damage.

Main Methods:

  • Whole-genome sequencing of 717 normal naive and memory B and T cells, alongside hematopoietic stem cells.
  • Development of protocols for single-cell lymphocyte culture expansion.

Main Results:

  • Lymphocyte subsets exhibit higher point mutation and structural variant burdens than hematopoietic stem cells, with memory cells having higher loads than naive cells.
  • T cells accumulate mutations faster throughout life; off-target immune diversification accounts for ~50% of differentiation-associated mutations.
  • Lymphocytes show 16-fold higher structural variation than stem cells, with UV and other processes contributing significant mutations in memory cells.

Conclusions:

  • The mutational landscape of normal lymphocytes reflects off-target genome engineering during immune diversification and environmental exposures.
  • Mutation patterns in normal B cells are similar to those in B-cell cancers, suggesting shared underlying mutational processes.