Regulation of X chromosome inactivation in mammals requires precise control of the levels of the non-coding RNA Xist. Almeida et al. describe an autoregulatory mechanism in which nascent Xist transcri...

Nature - Analysis of the longest-lived mammal, the bowhead whale, reveals an improved ability to repair DNA breaks, mediated by high levels of cold-inducible RNA-binding protein.

Here Schwämmle et al. develop CRISPR reporter screens to map transcription-factor-regulatory element interactions at the Xist locus, revealing a two-step mechanism integrating developmental and X-dosage signals to initiate X-chromosome inactivation.

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