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Characterization of early postzygotic somatic mutations through multi-organ analysis
Hyeonjin Lee1,2, Eun Na Kim3, Ji-Young Lee1,2
1Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
Journal of Human Genetics
|February 21, 2021
Summary
Genomic mosaicism, arising from early embryonic mutations, impacts organ development and disease. Analyzing multiple organs reveals tissue-specific growth patterns and the role of somatic mutations in human development.
Area of Science:
- Genetics
- Developmental Biology
- Human Disease
Background:
- Mosaicisms from postzygotic mutations are increasingly linked to human diseases.
- Characterizing postzygotic somatic mutations' developmental lineage is crucial but underexplored.
Purpose of the Study:
- To investigate the developmental lineage and distribution of early embryonic mosaic variants.
- To understand the impact of somatic mutations on organ development and disease.
Main Methods:
- Whole-genome sequencing (WGS) and targeted deep sequencing were performed on 15 organs from a single male fetus.
- Analysis focused on identifying and characterizing early embryonic mosaic variants across developmental lineages.
Main Results:
- Eight early embryonic mosaic variants (C>T, T>C transitions) were detected in all 15 organs, originating at the two or four-cell stage.
- No organ-specific mutation occurrence was found, but varying allele fractions suggested tissue-specific asymmetric cell growth.
- These variants did not alter protein function, but their differential distribution implies developmental impact.
Conclusions:
- Multi-organ analysis is essential for understanding genomic mosaicism.
- Early somatic mutations, even without functional consequence, can influence specific organ development and disease.
- This study provides insights into the biological role of mosaicism in embryonic development.
