Comparative transcriptome analysis reveals molecular adaptations underlying distinct immunity and inverted resting...

Area of Science:

• Evolutionary Biology
• Genomics
• Mammalian Evolution

Background:

• Bats (Chiroptera) possess unique traits like advanced immunity and inverted posture.
• Genomic data for key bat lineages are insufficient for studying trait evolution.
• Understanding molecular mechanisms behind bat-specific adaptations is crucial.

Purpose of the Study:

• To investigate the genomic basis of unique bat traits.
• To identify genes under natural selection in bats.
• To explore molecular adaptations related to immunity and posture.

Main Methods:

• Sequencing transcriptomes of 5 divergent bat species.
• Integrating data with existing bat and mammal genomes (21 species).
• Constructing a database of 10,918 one-to-one ortholog genes and phylogenetic analysis.

Main Results:

• Identified genes related to immunity, bone remodeling, and cardiovascular systems as targets of natural selection in bats.
• Found enrichment of the T cell receptor signaling pathway in bats, linked to immune adaptation.
• Discovered molecular adaptations in bone remodeling, cardiovascular, and balance systems potentially explaining inverted posture.

Conclusions:

• Provides valuable transcriptome resources for bat evolutionary studies.
• Tentatively identifies genetic changes underlying bat-specific traits, including immunity and posture.
• Offers insights into the molecular underpinnings of inverted posture, with potential implications for human health (e.g., hypertension).