Fidelity of meiosis in human oocytes can be compromised, leading to egg aneuploidy and impaired embryo development, which increase with advanced maternal age. Recent studies have shed light on the molecular mechanisms underlying aberrant chromosome segregation during oocyte meiosis and the impact of ageing on this process.

PIWI-interacting RNAs (piRNAs) are small non-coding RNAs with essential roles in germ line development through silencing of transposable elements and in regulation of protein-coding genes. Recent studies have deepened our understanding of the biogenesis and function of piRNAs and their roles in infertility, cancer and neurological diseases in humans.

AMP-activated protein kinase (AMPK) is a cellular energy sensor canonically activated by increases in AMP/ADP to ATP ratios. Recent advances revealed several non-canonical pathways for AMPK activation, including roles of calcium, nutrients and metabolites, as well as DNA and lysosome damage, providing novel insights into the pathology of AMPK in cancer, metabolic disease, fibrosis and inflammation.

Membraneless organelles (MLOs) contribute to intracellular compartmentalization and to various cellular processes. This Review provides a guide to MLOs involved in gene regulation in eukaryotes, discussing their assembly, structure, roles in transcription, RNA processing and translation — particularly in stress conditions — and their disease relevance.

In this Tools of the Trade article, Nouf Laqtom (at the Abu-Remaileh lab) describes the LysoIP system used to tag and isolate lysosomes for multi-omic approaches and to determine their composition under physiological and pathological states.

Quality control of misfolded glycosylphosphatidylinositol-anchored proteins (GPI-APs) does not occur through ER-associated degradation, as the lipid anchor precludes retrotranslocation across the ER membrane. Instead, different organisms have developed distinct solutions to prevent the accumulation of misfolded GPI-APs.

Transport of the developmental mRNA oskar to its destination at the posterior pole of the Drosophila embryo relies on the two dsRNA-binding proteins Egalitarian and Staufen that promote switching between the motor proteins dynein and kinesin.

A new study collaboratively delivered by Valentina Greco’s and Smita Krishnaswamy’s labs provides new insight into patterns of calcium signalling in epithelial tissues using intravital imaging of the basal layer of the mouse epidermis.

Zuzana Storchová recounts the discovery of the subtle yet significant consequences of polyploidy.

The eukaryotic genome is organized into topologically associating domains by cohesin and CTCF. Davidson et al. now reveal a role for DNA tension in the regulation of the CTCF–cohesin interaction to modulate domain boundaries.