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Polytene Chromosomes

Polytene Chromosomes

Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...

Sperm Structure and Semen Composition

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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...

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Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

Published on: January 20, 2014

Sperm ultrastructure in Chironomoidea (Insecta, Diptera).

Romano Dallai¹, Bianca Maria Lombardo, Pietro Lupetti

¹Dipartimento di Biologia Evolutiva, Università di Siena, Italy. dallai@unisi.it

|May 29, 2007

Summary

Spermatozoa fine structure reveals a unique centriole adjunct in chironomids. Despite variations in axoneme patterns, sperm motility is maintained, with maturation occurring during ductal progression.

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Area of Science:

Entomology
Cell Biology
Reproductive Biology

Background:

Spermatozoa fine structure provides insights into insect reproductive biology.
Chironomids, Culicoides, and Odagmia pontina represent diverse dipteran families with unique evolutionary paths.

Purpose of the Study:

To investigate and compare the ultrastructure of spermatozoa across selected chironomid, Culicoides, and Odagmia pontina species.
To identify conserved and divergent features in sperm morphology within the Chironomoidea superfamily.

Main Methods:

Transmission electron microscopy (TEM) was employed to examine the fine structure of spermatozoa.
Comparative analysis of sperm components, including acrosome, axoneme, and centriole adjunct, was performed.

Main Results:

A synapomorphic feature of nine kidney-shaped structures forming the centriole adjunct was identified in chironomid species.
All Chironomoidea members exhibit a mono-layered acrosome and a flagellar axoneme with accessory tubules containing 15 protofilaments.
A 9+9+2 axoneme pattern was common, with a rare 9+9+0 variation observed in an unidentified chironomid species lacking central complex and spokes.
Sperm motility was preserved across all examined species, and spermatozoa showed signs of completing maturation within the deferent ducts.

Conclusions:

The centriole adjunct structure is a significant synapomorphic feature for chironomid species.
Despite axonemal variations, sperm motility is a conserved trait in these insect groups.
Spermatozoa maturation is a dynamic process occurring during transit through the deferent ducts.