A comparative transcriptomic analysis provides new insights into the ecological adaptations in Ichthyophis bannanicus

Area of Science:

• Amphibian genomics
• Comparative transcriptomics
• Evolutionary biology

Background:

• The Banna caecilian (Ichthyophis bannanicus) is a unique Gymnophiona species in China.
• Limited molecular-level studies exist for I. bannanicus, despite known distribution and morphology.
• Gene expression profiling is crucial for understanding its biological functions.

Purpose of the Study:

• To create a comprehensive transcriptomic atlas of I. bannanicus.
• To identify molecular mechanisms behind ecological adaptation.
• To compare gene expression across tissues and species.

Main Methods:

• Generated a high-resolution transcriptomic atlas of 19 major organs.
• Identified housekeeping genes (HKGs) and tissue-specific genes (TSGs).
• Utilized weighted gene co-expression network analysis and cross-species comparisons.

Main Results:

• Identified 5,092 HKGs and 2,169 TSGs.
• HKGs support basic cellular functions; TSGs and module genes relate to tissue specialization.
• Revealed enhanced immune capacity and potential gene losses (e.g., RCVRN.1, MAPK14) linked to degeneration.

Conclusions:

• HKGs, TSGs, and co-expression modules provide insights into tissue specialization and evolution.
• Comparative transcriptomics offers clues to molecular features driving ecological adaptation in I. bannanicus.