Machine learning is widely applied in various fields of genomics and systems biology. In this Review, the authors describe how responsible application of machine learning requires an understanding of several common pitfalls that users should be aware of (and mitigate) to avoid unreliable results.

Loci that encode long non-coding RNAs (lncRNAs) can be complex and function through multiple modalities. The authors provide a framework for elucidating the physiological roles of lncRNAs using genetically engineered mouse models, including whole-gene deletion, transcription termination, reporters and transgene rescue strategies.