217: Multiscale triads of meiotic crossover patterning

White MA et al., Nature Communications - FFT and inverse-FFT analysis of Zip3/Zip2, Hop1 and Zip1 on yeast pachytene chromosomes reveals two interdigitated tiers of evenly spaced protein triads that correspond to canonical and minority crossovers and are differentially regulated by Pch2/TRIP13. Key terms: crossover interference, meiotic chromosomes, Zip3/Zip2, Hop1, Pch2. Study Highlights:Quantitative fluorescence profiles and Fourier analysis identify two dominant spatial periodicities centered near 0.5 µm and 1.0 µm for Zip3/Zip2, Hop1 and Zip1 along pachytene chromosomes. Inverse FFT reconstructs narrow and broad peaks that colocalize into triads of the three proteins with intra-triad separations of ~70 nm. Shorter-periodicity triads map to canonical Zip3-defined crossovers and show classical interference, while longer-periodicity triads are interdigitated with shorter triads and also exhibit interference. The ratio, spacing relationships, and modulation by Pch2/TRIP13 support the interpretation that longer-periodicity triads correspond to minority crossovers and that Pch2 selectively alters abundance and relative loading in the longer-tier triads Conclusion:Crossover interference establishes two interdigitated, multiscale patterns of tightly clustered Zip2/Zip3–Hop1–Zip1 triads along meiotic chromosomes, linking canonical and minority crossovers into a single interference-governed process Music:Enjoy the music based on this article at the end of the episode. First author:White MA Journal:Nature Communications DOI:10.1038/s41467-025-65423-6 Reference:White MA, Weiner B, Chu L, Lim G, Prentiss M & Kleckner N. Crossover interference mediates multiscale patterning along meiotic chromosomes. Nature Communications. 2025;16:10453. https://doi.org/10.1038/s41467-025-65423-6 License:This episode is based on an open-access article published under the Creative Commons Attribution 4.0 International License (CC BY 4.0) – https://creativecommons.org/licenses/by/4.0/ Support:Base by Base – Stripe donations: https://donate.stripe.com/7sY4gz71B2sN3RWac5gEg00 Official website https://basebybase.com On PaperCast Base by Base you’ll discover the latest in genomics, functional genomics, structural genomics, and proteomics. Episode link: https://basebybase.com/episodes/multiscale-crossover-triad-patterning QC:This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-12-03. QC Scope:- article metadata and core scientific claims from the narration- excludes analogies, intro/outro, and music- transcript coverage: Audited the transcript's discussion of the paper's key scientific claims and methods: FFT/IFFT decomposition revealing two periodicities, triad clustering of Zip3-Hop1-Zip1, canonical vs minority crossovers, interdigitation and spacing, CoC/LCoC analyses, and the role of Pch2, including a two-tier sequential model and- transcript topics: Crossover interference and canonical vs minority crossovers; FFT and inverse-FFT analysis revealing two periodicities; Triad structure of Zip3-Hop1-Zip1 along chromosomes; Interference metrics: CoC and LCoC; Interdigitation of two triad types and precursor spacing (~0.23 μm); Minority crossovers and their ratio to canonical crossovers (~0.46:1) QC Summary:- factual score: 10/10- metadata score: 10/10- supported core claims: 8- claims flagged for review: 0- metadata checks passed: 4- metadata issues found: 0 Metadata Audited:- article_doi- article_title- article_journal- license Factual Items Audited:- Two interdigitated patterns with shorter (~0.5 μm) and longer (~1 μm) periodicities for crossover-related components- Triplet (triad) clustering of Zip...