The myoglobin of primates X

Area of Science:

• Evolutionary Biology
• Primate Genomics
• Molecular Evolution

Background:

• Myoglobin, a protein crucial for oxygen storage in muscle tissue, plays a role in understanding evolutionary relationships.
• Previous studies have established myoglobin sequences for numerous primate species, providing a foundation for comparative analysis.
• Understanding primate evolutionary history relies on analyzing conserved and divergent molecular markers like myoglobin.

Purpose of the Study:

• To determine the amino acid sequences of skeletal muscle myoglobins from Presbytis entellus (Old World monkey) and Cebus apella (New World monkey).
• To phylogenetically analyze these new myoglobin sequences alongside existing primate data.
• To investigate the evolutionary conservation of myoglobin within cercopithecoid primates.

Main Methods:

• Amino acid sequencing of myoglobins was inferred using peptide homology with human myoglobin.
• Selective dansyl-Edman degradation was employed for sequence determination.
• Phylogenetic analysis incorporated the newly determined sequences with 15 previously reported primate myoglobin sequences.

Main Results:

• The amino acid sequences for Presbytis entellus, Erythrocebus patas, and Cebus apella myoglobins were successfully inferred.
• Phylogenetic analysis revealed that myoglobin evolution has been highly conservative among cercopithecoid primates.
• The high degree of sequence conservation in myoglobin made it impossible to distinguish between the two surviving cercopithecoid subfamilies.

Conclusions:

• Myoglobin sequence data indicates extreme evolutionary conservatism within cercopithecoid primates.
• The myoglobin protein is not a suitable marker for resolving deep phylogenetic divergences among cercopithecoid subfamilies.
• Further molecular markers may be required to elucidate the evolutionary history and relationships between cercopithecoid primate subfamilies.