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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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Related Experiment Video

Updated: Oct 23, 2025

Screening Sperm for the Rapid Isolation of Germline Edits in Zebrafish
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CRISPs Function to Boost Sperm Power Output and Motility.

Avinash S Gaikwad1,2, Ashwin Nandagiri3,4, David L Potter5

  • 1School of Biological Sciences, Monash University, Clayton, VIC, Australia.

Frontiers in Cell and Developmental Biology
|August 23, 2021
PubMed
Summary
This summary is machine-generated.

Cysteine-rich secretory proteins (CRISPs) are crucial for sperm motility and fertilization. This study reveals how CRISP1, CRISP2, and CRISP4 proteins individually optimize sperm tail function for successful reproduction.

Keywords:
axonemecrispflagellamale fertilitymale infertilitysperm function

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Area of Science:

  • Reproductive Biology
  • Molecular Mechanobiology
  • Sperm Physiology

Background:

  • Sperm motility is essential for fertilization, but the underlying protein functions are not fully understood.
  • Poor sperm motility is strongly linked to infertility, highlighting the need to study sperm mechanics.
  • The role of Cysteine-Rich Secretory Proteins (CRISPs) in sperm function requires further investigation.

Purpose of the Study:

  • To elucidate the specific roles of CRISP1, CRISP2, and CRISP4 in sperm mechanobiology.
  • To define how individual CRISP proteins contribute to sperm tail movement kinetics and efficiency.

Main Methods:

  • Utilized a high spatiotemporal sperm imaging system for detailed analysis of sperm tail movement.
  • Developed and applied a specialized analysis protocol to quantify protein-specific effects on sperm function.

Main Results:

  • CRISP1, CRISP2, and CRISP4 are individually essential for optimizing sperm flagellum waveform.
  • Each CRISP protein autonomously regulates distinct aspects of sperm tail performance, including beat frequency, flexibility, and power dissipation.
  • The expansion of the CRISP gene family demonstrates neofunctionalization, with proteins evolving specialized roles in sperm tail mechanics.

Conclusions:

  • CRISP proteins play distinct and vital roles in optimizing sperm motility through precise control of flagellar mechanics.
  • The evolution of multiple CRISP family members reflects adaptation for fine-tuning sperm tail performance for reproductive success.
  • Understanding CRISP function offers new insights into male infertility and potential therapeutic targets.