Putatively asexual chrysophytes have meiotic genes: evidence from transcriptomic data

Area of Science:

• Protistology
• Molecular Biology
• Evolutionary Biology

Background:

• Chrysophytes are diverse protists found in various environments.
• Their reproductive strategies, particularly sexual reproduction, remain largely uncharacterized.
• Understanding chrysophyte reproduction is key to their ecological and evolutionary studies.

Purpose of the Study:

• To investigate the potential for sexual reproduction in chrysophytes.
• To identify genes associated with meiosis in chrysophyte species.
• To provide evidence for or against sexual reproduction in this group.

Main Methods:

• Analysis of available transcriptomes from 18 isolates across 15 putatively asexual chrysophyte species.
• Inventorying the presence of known meiosis-specific and meiosis-related genes within these transcriptomes.
• Comparative genomics approach to identify conserved meiotic genes.

Main Results:

• A conserved set of nine meiosis-specific genes was detected in the analyzed chrysophyte transcriptomes.
• Additionally, 29 meiosis-related genes were identified across the species.
• These genes are homologous to those known to be involved in sexual reproduction in other eukaryotes.

Conclusions:

• The presence of conserved meiotic genes strongly suggests that chrysophytes engage in sexual reproduction.
• Chrysophytes are likely "secretively sexual," with their sexual cycle not easily observed.
• Further genomic investigation is recommended to fully elucidate the mechanisms of sexual reproduction in chrysophytes.