News | FER1L5 Protein: A Key Molecule in Male Infertility
Fertilization is the process in which an egg and sperm unite. Before fusion can occur, sperm must undergo a key step called the acrosome reaction. A research team at Osaka University recently found that a protein called FER1L5 plays a critical role in enabling sperm to complete this reaction, opening a new direction for diagnosing and treating male infertility.
The Acrosome Reaction and the Role of FER1L5
The front of the sperm head is covered by a cap-like vesicle called the acrosome. As mammalian sperm travel through the female reproductive tract, the acrosome reaction releases molecules that help sperm penetrate the egg’s protective outer layer and complete fertilization. Although the acrosome reaction is essential to fertilization, its molecular regulation has not been fully understood.
The team closely examined the FER-1 protein in the nematode C. elegans. In nematodes, FER-1 is essential for the fusion of membranous organelles in sperm and the initiation of amoeboid movement. Mammals have six ferlin-family proteins similar to FER-1: DYSF, OTOF, MYOF, FER1L4, FER1L5, and FER1L6. Some are associated with muscular dystrophy and hearing impairment, but whether they are involved in mammalian sperm function requires further research.
Loss of FER1L5 Prevents the Acrosome Reaction
Using gene-editing technology, the team created mice lacking the FER1L5 gene. Sperm from the male mice could not complete the acrosome reaction and therefore could not fertilize eggs. First author Akane Morohoshi explained: “Even when we used a strong inducer, sperm lacking FER1L5 could not trigger the acrosome reaction, showing that FER1L5 is essential for initiating it.”
Notably, fertility was unaffected in female mice lacking FER1L5, further highlighting the protein’s specific role in sperm function.
From Nematodes to Mammals: Evolutionary Conservation of Ferlin Proteins
Senior author Masahito Ikawa said: “Our study shows that the functions of ferlin-family proteins are highly conserved through evolution, from nematodes to mice, despite the very different shapes of their sperm.”
FER1L5 protein has been identified in human sperm, making the findings an important lead for research on human male infertility. Further study of the FER1L5 molecular mechanism may support the development of new diagnostic methods and treatments for infertility.
News | FER1L5 Protein: A Key Molecule in Male Infertility
News | FER1L5 Protein: A Key Molecule in Male Infertility
Fertilization is the process in which an egg and sperm unite. Before fusion can occur, sperm must undergo a key step called the acrosome reaction. A research team at Osaka University recently found that a protein called FER1L5 plays a critical role in enabling sperm to complete this reaction, opening a new direction for diagnosing and treating male infertility.
The Acrosome Reaction and the Role of FER1L5
The front of the sperm head is covered by a cap-like vesicle called the acrosome. As mammalian sperm travel through the female reproductive tract, the acrosome reaction releases molecules that help sperm penetrate the egg’s protective outer layer and complete fertilization. Although the acrosome reaction is essential to fertilization, its molecular regulation has not been fully understood.
The team closely examined the FER-1 protein in the nematode C. elegans. In nematodes, FER-1 is essential for the fusion of membranous organelles in sperm and the initiation of amoeboid movement. Mammals have six ferlin-family proteins similar to FER-1: DYSF, OTOF, MYOF, FER1L4, FER1L5, and FER1L6. Some are associated with muscular dystrophy and hearing impairment, but whether they are involved in mammalian sperm function requires further research.
Loss of FER1L5 Prevents the Acrosome Reaction
Using gene-editing technology, the team created mice lacking the FER1L5 gene. Sperm from the male mice could not complete the acrosome reaction and therefore could not fertilize eggs. First author Akane Morohoshi explained: “Even when we used a strong inducer, sperm lacking FER1L5 could not trigger the acrosome reaction, showing that FER1L5 is essential for initiating it.”
Notably, fertility was unaffected in female mice lacking FER1L5, further highlighting the protein’s specific role in sperm function.
From Nematodes to Mammals: Evolutionary Conservation of Ferlin Proteins
Senior author Masahito Ikawa said: “Our study shows that the functions of ferlin-family proteins are highly conserved through evolution, from nematodes to mice, despite the very different shapes of their sperm.”
FER1L5 protein has been identified in human sperm, making the findings an important lead for research on human male infertility. Further study of the FER1L5 molecular mechanism may support the development of new diagnostic methods and treatments for infertility.
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