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Abstract
Catsper3 and Catsper4 are two recently
identified testis-specific genes homologous to
Catsper1 and Catsper2 which have been shown
to play an essential role in sperm hyperactivated motility
and male fertility in mice. Here we report that
Catsper3 and Catsper4 knockout male mice
are completely infertile due to a quick loss of motility
and a lack of hyperactivated motility under capacitating
conditions. Our data demonstrate that both CATSPER3 and
CATSPER4 are required for hyperactivated sperm motility
during capacitation and for male fertility. The present
study also demands a revisit on the idiopathic male
infertility patients who show normal sperm counts and
normal initial motility for defects in sperm
hyperactivated motility and for potential CATSPER gene
mutations. The CATSPER channel may also be an excellent
drug target for male contraceptives.
Key words:
Sperm
Sperm capacitation
Sperm maturation
Sperm motility and transport
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