Structural peculiarities associated with multiflagellate sperm in the emu, Dromaius novaehollandiae

Show simple item record Du Plessis, Lizette Soley, John Thomson 2012-11-01T10:14:59Z 2012-11-01T10:14:59Z 2012-09
dc.description.abstract Multiflagellate sperm represent a rare defect in mammals and also in the emu where an incidence of only 1% multiflagellate sperm was recorded in semen samples from 15 birds. Biflagellate sperm were the most frequent form of the defect observed, but 3- to 5-tailed sperm were also noted. An association was apparent between multiple tails and macrocephalic sperm, which accounted for 0.6% of multiflagellate sperm. Structural features of the defect were generally similar to those seen in mammals. The duplicated tails shared a single midpiece, which housed supernumerary centriolar complexes, each surrounded by a mitochondrial sheath. A single row of mitochondria separated adjacent centriolar complexes. Elements of the connecting piece (segmented columns, capitellum) appeared normal. The nuclear base appeared flat, staggered, or scalloped depending on the number and depth of additional implantation fossae. Multiflagellate emu sperm of normal head dimensions displayed a widened nuclear base (in the form of an attenuated peripheral nuclear extension) to accommodate the attachment of the additional centriolar complexes. Defective mammalian sperm do not show this modification of the nuclear base as the inherently wider sperm head is able to accommodate the supernumerary centrioles. Although often spiraled around each other, the duplicated principal pieces of the tail were generally separated and free. However, in some cells the proximal parts were collectively bound within the plasmalemma. Multiflagellate sperm appear to have a dual origin with some defective cells originating from incomplete cytokinesis and others as a result of abnormal centriolar duplication. en
dc.description.librarian ab2012 en
dc.description.uri en
dc.identifier.citation L. du Plessis & J.T. Soley, Structural peculiarities associated with multiflagellate sperm in the emu, Dromaius novaehollandiae, Theriogenology, vol. 78, no. 5, pp. 1094-1101 (2012), doi: 10.1016/j.theriogenology.2012.04.018. en
dc.identifier.issn 0093-691X (print)
dc.identifier.issn 1879-3231 (online)
dc.identifier.other 10.1016/j.therionology.2012.04.018
dc.identifier.other 6701816856
dc.identifier.other G-9839-2014
dc.language.iso en en
dc.publisher Elsevier en
dc.rights © 2012 Elsevier. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Theriogenology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published Theriogenology, vol 78, issue 5, September 2012, doi: 10.1016/j.theriogenology.2012.04.018. en
dc.subject Dromaius novaehollandiae en
dc.subject Multiple tails en
dc.subject.lcsh Emus en
dc.subject.lcsh Spermatozoa en
dc.title Structural peculiarities associated with multiflagellate sperm in the emu, Dromaius novaehollandiae en
dc.type Postprint Article en

Files in this item

This item appears in the following Collection(s)

Show simple item record