Bone mechano-response is driven by locomotion transitions during vertebrate evolution

Area of Science:

• Biochemistry
• Evolutionary Biology
• Biomechanics

Background:

• The skeleton provides structural support against gravity and daily mechanical loads.
• Understanding bone's response to mechanical stress is crucial for skeletal health.
• Non-collagenous bone matrix proteins are implicated in bone adaptation.

Purpose of the Study:

• To investigate the role of non-collagenous bone matrix proteins in mechanical loading.
• To identify molecular mechanisms underlying bone mechano-response.
• To explore the evolutionary basis of bone's response to mechanical stress.

Main Methods:

• Osteoblast cell cultures were used to study protein responses to mechanical stimulation.
• Phylogenetic analyses were employed to examine evolutionary patterns.
• Selection analyses were performed on non-collagenous proteins.

Main Results:

• Several non-collagenous proteins were found to significantly regulate bone's response to mechanical stress.
• Bone mechano-response appears to be an evolutionary-driven process.
• Fetuin A exhibited significant expression changes and was positively selected during key evolutionary transitions.

Conclusions:

• Non-collagenous bone matrix proteins are critical regulators of bone adaptation to mechanical forces.
• Evolutionary transitions, such as the water-to-land movement and bipedalism, shaped the function of these proteins.
• Fetuin A is a key protein involved in bone's evolutionary adaptation to mechanical stress.