Protamine P1 sequences in equids: comparison with even-toed animals.

Arja Pirhonen¹, Annikka Linnala-Kankkunen, Robert M Kenney

¹Department of Biochemistry, University of Kuopio, Finland.

|September 6, 2002

Summary

Equid protamine P1 sequences show minimal variation, with Przewalski and domestic horses being identical. Zebras, donkeys, and wild asses have unique amino acid changes potentially affecting chromosome condensation.

Area of Science:

Comparative genomics
Molecular evolution
Mammalian reproductive biology

Background:

Protamine P1 is a key protein in sperm chromatin condensation.
It is known for rapid amino acid sequence evolution across species.
Understanding protamine P1 variation in equids can shed light on species-specific reproductive adaptations.

Purpose of the Study:

To determine and compare protamine P1 amino acid sequences in various equid species.
To investigate the evolutionary conservation and variation of protamine P1 within odd-toed ungulates (Perissodactyla).
To explore potential functional implications of observed sequence differences.

Main Methods:

Amino acid sequencing of protamine P1 from semen samples.
Comparative sequence analysis of protamine P1 from Przewalski horse, donkey, Somali wild ass, Grevy's zebra, Grant's zebra, and domestic horse.
Phylogenetic comparison with protamines from even-toed ungulates (Artiodactyla).

Main Results:

Equid protamine P1 sequences exhibited low variation.
Przewalski horse and domestic horse protamine P1 sequences were identical.
Zebras, donkey, and Somali wild ass sequences differed at two positions (Ser29 to Cys, Gln32 to Arg), potentially enabling an additional disulfide bridge.

Conclusions:

Protamine P1 is highly conserved among equids, contrary to its rapid evolution in other mammals.
Specific amino acid substitutions in certain equid species may influence sperm chromosome condensation.
Observed equid protamine P1 variations are distinct from those found in artiodactyls.

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Protamine P1 sequences in equids: comparison with even-toed animals.

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Related Experiment Videos

Protamine P1 sequences in equids: comparison with even-toed animals.

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

Related Concept Videos

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