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Multiple synaptonemal complexes (polycomplexes): origin, structure and function.

¹Department of Biological Sciences, University of Texas at El Paso 79968.

Cell Biology International Reports

|November 1, 1987

Summary

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Multiple synaptonemal complexes (polycomplexes) are conserved structures found across many organisms. Recent findings reveal their lateral elements are multistranded, explaining their thickness in polycomplexes compared to synaptonemal complexes.

Area of Science:

Cell Biology
Genetics
Evolutionary Biology

Background:

Multiple synaptonemal complexes (polycomplexes) are conserved structures resembling synaptonemal complexes.
Polycomplexes are found in over 70 organisms across all domains of life.
Their presence is typically restricted to meiotic and germ-line tissues, often appearing after synaptonemal complex formation.

Purpose of the Study:

To investigate the structural basis of polycomplex formation and its relationship with synaptonemal complexes.
To reconcile the observed dimensions of polycomplexes with their tripartite structure.

Main Methods:

Structural analysis of polycomplexes and synaptonemal complexes.
Biochemical composition analysis.
Comparative structural studies across different organisms.

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Main Results:

Polycomplexes share a tripartite structure (two lateral elements, central region) with synaptonemal complexes, maintaining equivalent dimensions.
A key challenge was explaining how stacked units maintain SC dimensions if lateral elements double in thickness.
Recent evidence shows lateral elements of synaptonemal complexes are multistranded, meaning polycomplex lateral elements are half the thickness of their synaptonemal complex counterparts.

Conclusions:

The multistranded nature of lateral elements resolves the structural paradox in polycomplex formation.
Polycomplexes represent a conserved structural adaptation related to synaptonemal complexes.
Further research can explore the functional implications of this structural conservation.