DNA Double-Strand Breaks: A Double-Edged Sword for Trypanosomatids.

Area of Science:

• Molecular Biology
• Genetics
• Parasitology

Background:

• DNA double-strand breaks (DSBs) are typically harmful to eukaryotic cells, causing mutations and cancer.
• However, trypanosomatids, a group of parasitic protozoa, uniquely depend on DSBs for critical life cycle functions.

Purpose of the Study:

• To review the latest findings on how trypanosomatids utilize and manage DNA double-strand breaks (DSBs).
• To explore the role of homologous recombination (HR) in repairing DSBs within these parasites.

Main Methods:

• This review synthesizes findings from various studies on trypanosomatid DNA repair mechanisms.
• Focuses on homologous recombination (HR) as the primary DSB repair pathway in trypanosomatids.

Main Results:

• Trypanosomes employ DSBs for host immune evasion (Trypanosoma brucei), genetic exchange (Trypanosoma cruzi), and generating genomic diversity via copy number variations (Leishmania spp.).
• DSB processing in trypanosomatids is predominantly HR-dependent, enabling crucial genetic manipulations.

Conclusions:

• Unlike other eukaryotes, trypanosomatids have evolved to harness DSBs for survival and adaptation.
• Understanding these unique DSB-related processes is key to comprehending trypanosomatid biology and developing interventions.