from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Transformation of a spermatid into a spermatozoon.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biology The final stage of
spermatogenesis. It involves the maturation of the spermatidsinto spermatozoa.
from The American Heritage® Dictionary of the English Language, 4th Edition
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In the final step, spermiogenesis, the DNA coils in the sperm's head.
• It includes the 1st + 2nd meiotic division + spermiogenesis.
We discussed spermatogenesis -- how we got from a diploid spermatogonial stem cell to a haploid spermatid -- and then spermiogenesis -- the process by which the spermatids acquire the features of spermatozoa: tails, acrosomes and the like.
The association of AQP11 with the residual cytoplasm of elongated spermatids and the distal tail of spermatozoa supports the hypothesis of more than just a role in conferring water permeability and also in the turnover and recycling of surplus cellular components made redundant during spermiogenesis and spermiation.
The team had already zeroed in on the Jhdm2a enzyme, showing in a 2007 Nature publication that the Jhdm2a gene is highly expressed in mouse testes and plays an important role in spermiogenesis, the final step in the production of a functional sperm cell.
"One is control of spermiogenesis; the other is control of metabolism."
This finding indicates that CatSper has no required role in the prior developmental events that determine the assembly of an asymmetry-competent flagellum during spermiogenesis, or in downstream signaling events that couple Ca
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