Multilevel Selection Theory and the Evolutionary Functions of Transposable Elements

Area of Science:

• Evolutionary biology
• Genomics
• Molecular genetics

Background:

• The functional significance of non-coding DNA, often termed "junk DNA," is under renewed debate.
• Transposable elements (TEs) constitute a significant portion of nuclear DNA in many species, yet their contribution to fitness remains contested.
• Current understanding often focuses on selection within species, potentially overlooking broader evolutionary impacts.

Purpose of the Study:

• To review and expand upon arguments for selection acting at levels above the organism.
• To investigate the role of transposable elements (TEs) as a common genomic feature in higher-level selection.
• To re-evaluate the concept of

Main Methods:

• Literature review of selection at multiple levels of evolution.
• Conceptual development of arguments for higher-level selection.
• Application of these arguments to the study of transposable elements (TEs).

Main Results:

• Selection can operate effectively at inter-species and clade levels, influencing evolutionary trajectories.
• Transposable elements (TEs), despite potential selfish origins, are subject to selection pressures at organismal and inter-species levels.
• The prevalence and impact of TEs may be better understood through the lens of higher-level selection, particularly concerning speciation and extinction rates.

Conclusions:

• The functional role of transposable elements (TEs) may be most accurately attributed to their influence on higher-level evolutionary processes.
• Viewing genomic features through the framework of multi-level selection offers a more comprehensive understanding of their evolutionary significance.
• Transposable elements (TEs) might accelerate evolution at the clade level, impacting long-term biodiversity.