Detection and Characterization of Clonal Hematopoiesis

Area of Science:

• Hematology
• Genetics
• Oncology

Background:

• Clonal hematopoiesis (CH) involves age-related expansion of hematopoietic stem cell clones due to somatic mutations or mosaic chromosomal alterations.
• CH is associated with increased risks of hematologic malignancies, cardiovascular diseases, metabolic disorders, and organ ailments, leading to higher mortality.
• While myeloid CH is well-studied, lymphoid CH (L-CH) involves diverse genes and lower prevalence, complicating detection.

Purpose of the Study:

• To describe an error-corrected targeted sequencing approach for enhanced detection of CH.
• To establish a reliable protocol for identifying CH in bone marrow (BM) and peripheral blood (PB) samples.
• To facilitate the study of L-CH, which presents unique detection challenges.

Main Methods:

• Development of an error-corrected targeted sequencing protocol for CH detection.
• Inclusion of DNA isolation from PB and BM samples.
• Library preparation with molecular tags, quality control, and computational variant filtering.

Main Results:

• Successful establishment of an error-corrected targeted sequencing approach for CH detection.
• Demonstrated utility of the protocol across various patient cohorts.
• Improved precision in detecting low-frequency variants characteristic of L-CH.

Conclusions:

• The developed targeted sequencing method offers a precise and efficient way to detect CH, including L-CH.
• This protocol aids in identifying individuals at risk for CH-associated conditions.
• The methodology provides a valuable tool for further research into the biological and clinical implications of CH.