By Jimmy D. Neill, Ph.D., Tony M. Plant, Ph.D., Donald W. Pfaff, Ph.D., John R.G. Challis, D.Sc., F.R.S.C., David M. de Kretser, M.D., A.O., JoAnne S. Richards, Ph.D., and Paul M. Wassarman, Ph.D. (Eds.)
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Additional info for Knobil and Neill's Physiology of Reproduction
Example text
It also appeared that tektins are present in centrioles in mammalian tissue culture cells (372). The three tektin genes are highly conserved and orthologues are expressed in mammals, principally in male germ cells and in ciliated cells. The first mammalian tektin gene cloned was mouse Tekt1 (374). The gene is expressed highly during spermatogenesis and an antibody to TEK1 labeled the centrosome in spermatids and the caudal end of the sperm head in elongating spermatids, but no signal was detected in epididymal sperm (375).
A similar pattern is also present in the acrosome of human sperm (239). Other evidence that the acrosome has a substructure comes from studies on hamster spermatozoa disrupted by nitrogen cavitation. This treatment results in loss of much of the acrosomal matrix, but components immediately underlying the outer acrosomal membrane remain intact (76). These components are present in two areas: one is a larger and looser layer of fibrous material over the dorsal and lateral surfaces of the acrosome, whereas the other is a more compact fibrous layer adjacent to the anterior margin of the acrosome.
However, in some species it also appears that forces intrinsic to the acrosome are involved. Acrosomes of guinea pig, chinchilla, and hamster sperm continue to undergo morphological differentiation after spermatogenesis, and the definitive shape is not achieved until sperm reaches the distal portion of the epididymis (13,231). As might be expected from species differences, genetic factors also influence acrosome formation and shape. For example, structurally defective acrosomes form in pink-eyed sterile mutant mice (233,234).