ADAM5 is required for sperm-zona pellucida binding and sperm oviduct migration†

Area of Science:

• Reproductive Biology
• Molecular Biology
• Genetics

Background:

• ADAM5 is a testis-specific transmembrane protein.
• Its function in male fertility is largely unknown.

Purpose of the Study:

• To investigate the role of ADAM5 in male fertility and sperm function.

Main Methods:

• Generated Adam5 knockout (KO) male mice.
• Analyzed testicular morphology, sperm parameters, and sperm-egg interactions.
• Performed Western blot analysis to assess protein levels.

Main Results:

• Adam5 KO male mice were severely subfertile with normal testicular morphology and sperm motility.
• Adam5 KO sperm exhibited defects in uterotubal junction transit and zona pellucida binding.
• ADAM5 deficiency led to reduced levels of ADAM2 and ADAM3 in sperm and impaired extracellular matrix binding.

Conclusions:

• ADAM5 is crucial for sperm-egg interactions and male fertility.
• ADAM5 facilitates sperm binding to the extracellular matrix, essential for uterotubal junction transit and zona pellucida binding.
• Findings offer insights into ADAM protein function in mammalian reproduction.