News | ACTL7B Deficiency Reveals a Key Molecular Mechanism in Male Infertility
A study published in Development examined the role of ACTL7B in sperm formation. Using Actl7b-deficient mouse models, researchers analyzed its importance in spermatogenesis and gained new insight into the molecular mechanisms of male infertility.
Background
ACTL7B is a testis-specific protein highly conserved in rodents and primates. The gene is expressed only in the testes and is thought to be closely involved in spermatogenesis. Earlier studies suggested a fertility role, but its molecular function had not been studied in depth.
Methods
Using CRISPR/Cas9, researchers created heterozygous (Actl7b+/−) and homozygous (Actl7b−/−) deficient mouse models and examined sperm structure and function.
Actl7b deficiency caused structural abnormalities during sperm formation, especially malformed flagella. Mass spectrometry showed that ACTL7B interacts with LC8-type dynein light-chain proteins, which are important during stage 9 of spermatogenesis.
Findings
Actl7b-deficient mice showed arrest at stage 9 and multiple sperm-shape abnormalities. Abnormal sperm gradually degraded and were cleared by supporting cells. ACTL7B also interacted with dynein complexes in the microtubule network, affecting sperm motility.
Male mice with complete Actl7b loss had severe reductions and abnormalities in sperm, while heterozygous mice remained fertile despite lower ACTL7B protein levels. This suggests that ACTL7B deficiency may be closely related to human male infertility.
Significance
Because ACTL7B is highly similar in humans and mice, the study supports a possible role for ACTL7B variants in male infertility. ACTL7B may eventually serve as a biomarker to distinguish obstructive from nonobstructive azoospermia and inform diagnosis and treatment.
News | ACTL7B Deficiency Reveals a Key Molecular Mechanism in Male Infertility
News | ACTL7B Deficiency Reveals a Key Molecular Mechanism in Male Infertility
A study published in Development examined the role of ACTL7B in sperm formation. Using Actl7b-deficient mouse models, researchers analyzed its importance in spermatogenesis and gained new insight into the molecular mechanisms of male infertility.
Background
ACTL7B is a testis-specific protein highly conserved in rodents and primates. The gene is expressed only in the testes and is thought to be closely involved in spermatogenesis. Earlier studies suggested a fertility role, but its molecular function had not been studied in depth.
Methods
Using CRISPR/Cas9, researchers created heterozygous (Actl7b+/−) and homozygous (Actl7b−/−) deficient mouse models and examined sperm structure and function.
Actl7b deficiency caused structural abnormalities during sperm formation, especially malformed flagella. Mass spectrometry showed that ACTL7B interacts with LC8-type dynein light-chain proteins, which are important during stage 9 of spermatogenesis.
Findings
Actl7b-deficient mice showed arrest at stage 9 and multiple sperm-shape abnormalities. Abnormal sperm gradually degraded and were cleared by supporting cells. ACTL7B also interacted with dynein complexes in the microtubule network, affecting sperm motility.
Male mice with complete Actl7b loss had severe reductions and abnormalities in sperm, while heterozygous mice remained fertile despite lower ACTL7B protein levels. This suggests that ACTL7B deficiency may be closely related to human male infertility.
Significance
Because ACTL7B is highly similar in humans and mice, the study supports a possible role for ACTL7B variants in male infertility. ACTL7B may eventually serve as a biomarker to distinguish obstructive from nonobstructive azoospermia and inform diagnosis and treatment.
Story source:
Collected online