The Somatic Mosaicism across Human Tissues Network

Area of Science:

• Genomics
• Human Biology
• Molecular Biology

Background:

• Somatic mutations, DNA variations acquired after fertilization, occur due to replication errors or mutagens.
• Understanding somatic mutation frequency, type, and patterns in healthy tissues is limited.
• Detecting low-proportion somatic variants is challenging compared to inherited variants.

Purpose of the Study:

• To create a reference catalogue of somatic mutations and clonal patterns in 19 human tissue sites from 150 healthy donors.
• To develop advanced technologies and computational tools for somatic mutation detection.
• To assess phenotypic consequences of somatic mutations, including clonal expansions.

Main Methods:

• Established the Somatic Mosaicism across Human Tissues Network.
• Collected samples from 150 non-diseased individuals across 19 tissue types.
• Developed novel detection and analysis methods for somatic variants and clonal architecture.

Main Results:

• Generated a comprehensive catalogue of somatic mutations across diverse human tissues.
• Identified distinct patterns of somatic mutations and clonal expansions.
• Established a baseline for somatic mutation analysis in healthy individuals.

Conclusions:

• Provides a foundational understanding of the somatic mutational landscape in humans.
• Enables comparison with somatic mutation patterns in various diseases.
• Facilitates deeper insights into somatic mutations and clonal expansions throughout the lifespan, in aging, and disease.