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First spermatological study in the Atractotrematidae (Digenea, Haploporoidea): the case of Atractotrema sigani, intestinal parasite of Siganus lineatus.

Bakhoum AJ, Quilichini Y, Justine JL, Bray RA, Miquel J, Feliu C, Bâ CT, Marchand B - Parasite (2015)

Bottom Line: However, the mature spermatozoon of A. sigani has some specific characters such as the morphology of its anterior region and the submembranous electron-dense material.Although similar structures have been reported in some digenean species, the presence of a submembranous electron-dense material describing a complete ring is reported here for the first time in the mature spermatozoon of A. sigani.In addition, sperm characteristics are compared between the Haploporoidea and their supposed close superfamilies, and possible phylogenetic implications of these findings for the Digenea are discussed.

View Article: PubMed Central - PubMed

Affiliation: CNRS-Università di Corsica, UMR 6134-SPE, SERME Service d'Étude et de Recherche en Microscopie Électronique, Corte 20250, Corsica, France - Laboratory of Evolutionary Biology, Ecology and Management of Ecosystems, Cheikh Anta Diop University of Dakar, BP 5055, Dakar, Senegal.

No MeSH data available.


Schematic drawing of the spermatozoon of Atractotrema sigani. Aae1, anterior extremity of first axoneme; Aae2, anterior extremity of second axoneme; Ase, anterior spermatozoon extremity; Ax1, first axoneme; Ax2, second axoneme; Cm, cortical microtubules; Eo, external ornamentation of the plasma membrane; M1, first mitochondrion; M2, second mitochondrion; N, nucleus; Pae1, posterior extremity of axoneme 1; Pae2, posterior extremity of axoneme 2; Pm, plasma membrane; Pse, posterior spermatozoon extremity; Sb, spine-like body; Sdm, submembranous electron-dense material.
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Figure 4: Schematic drawing of the spermatozoon of Atractotrema sigani. Aae1, anterior extremity of first axoneme; Aae2, anterior extremity of second axoneme; Ase, anterior spermatozoon extremity; Ax1, first axoneme; Ax2, second axoneme; Cm, cortical microtubules; Eo, external ornamentation of the plasma membrane; M1, first mitochondrion; M2, second mitochondrion; N, nucleus; Pae1, posterior extremity of axoneme 1; Pae2, posterior extremity of axoneme 2; Pm, plasma membrane; Pse, posterior spermatozoon extremity; Sb, spine-like body; Sdm, submembranous electron-dense material.

Mentions: Region I (Figs. 1A–E and 4I) constitutes the anterior part of the spermatozoon showing in longitudinal section a sharp tip (Fig. 1A). In cross-section, the anterior spermatozoon extremity is characterized by the presence of the anterior extremity of the first axoneme and the submembranous electron-dense material which forms a complete ring (Figs. 1A and 4I). Consecutive cross-sections towards the posterior part of region I show the anterior extremity of the second axoneme accompanied by the first axoneme and the submembranous electron-dense material. This latter is reduced and located laterally when both axonemes are completely formed (Figs. 1C–E and 4I).


First spermatological study in the Atractotrematidae (Digenea, Haploporoidea): the case of Atractotrema sigani, intestinal parasite of Siganus lineatus.

Bakhoum AJ, Quilichini Y, Justine JL, Bray RA, Miquel J, Feliu C, Bâ CT, Marchand B - Parasite (2015)

Schematic drawing of the spermatozoon of Atractotrema sigani. Aae1, anterior extremity of first axoneme; Aae2, anterior extremity of second axoneme; Ase, anterior spermatozoon extremity; Ax1, first axoneme; Ax2, second axoneme; Cm, cortical microtubules; Eo, external ornamentation of the plasma membrane; M1, first mitochondrion; M2, second mitochondrion; N, nucleus; Pae1, posterior extremity of axoneme 1; Pae2, posterior extremity of axoneme 2; Pm, plasma membrane; Pse, posterior spermatozoon extremity; Sb, spine-like body; Sdm, submembranous electron-dense material.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4609001&req=5

Figure 4: Schematic drawing of the spermatozoon of Atractotrema sigani. Aae1, anterior extremity of first axoneme; Aae2, anterior extremity of second axoneme; Ase, anterior spermatozoon extremity; Ax1, first axoneme; Ax2, second axoneme; Cm, cortical microtubules; Eo, external ornamentation of the plasma membrane; M1, first mitochondrion; M2, second mitochondrion; N, nucleus; Pae1, posterior extremity of axoneme 1; Pae2, posterior extremity of axoneme 2; Pm, plasma membrane; Pse, posterior spermatozoon extremity; Sb, spine-like body; Sdm, submembranous electron-dense material.
Mentions: Region I (Figs. 1A–E and 4I) constitutes the anterior part of the spermatozoon showing in longitudinal section a sharp tip (Fig. 1A). In cross-section, the anterior spermatozoon extremity is characterized by the presence of the anterior extremity of the first axoneme and the submembranous electron-dense material which forms a complete ring (Figs. 1A and 4I). Consecutive cross-sections towards the posterior part of region I show the anterior extremity of the second axoneme accompanied by the first axoneme and the submembranous electron-dense material. This latter is reduced and located laterally when both axonemes are completely formed (Figs. 1C–E and 4I).

Bottom Line: However, the mature spermatozoon of A. sigani has some specific characters such as the morphology of its anterior region and the submembranous electron-dense material.Although similar structures have been reported in some digenean species, the presence of a submembranous electron-dense material describing a complete ring is reported here for the first time in the mature spermatozoon of A. sigani.In addition, sperm characteristics are compared between the Haploporoidea and their supposed close superfamilies, and possible phylogenetic implications of these findings for the Digenea are discussed.

View Article: PubMed Central - PubMed

Affiliation: CNRS-Università di Corsica, UMR 6134-SPE, SERME Service d'Étude et de Recherche en Microscopie Électronique, Corte 20250, Corsica, France - Laboratory of Evolutionary Biology, Ecology and Management of Ecosystems, Cheikh Anta Diop University of Dakar, BP 5055, Dakar, Senegal.

No MeSH data available.