, Volume 128, Issue 3, pp 297–316 | Cite as

Characterization of Pch2 localization determinants reveals a nucleolar-independent role in the meiotic recombination checkpoint

  • Esther Herruzo
  • Beatriz Santos
  • Raimundo Freire
  • Jesús A. Carballo
  • Pedro A. San-SegundoEmail author
Original Article


The meiotic recombination checkpoint blocks meiotic cell cycle progression in response to synapsis and/or recombination defects to prevent aberrant chromosome segregation. The evolutionarily conserved budding yeast Pch2TRIP13 AAA+ ATPase participates in this pathway by supporting phosphorylation of the Hop1HORMAD adaptor at T318. In the wild type, Pch2 localizes to synapsed chromosomes and to the unsynapsed rDNA region (nucleolus), excluding Hop1. In contrast, in synaptonemal complex (SC)–defective zip1Δ mutants, which undergo checkpoint activation, Pch2 is detected only on the nucleolus. Alterations in some epigenetic marks that lead to Pch2 dispersion from the nucleolus suppress zip1Δ-induced checkpoint arrest. These observations have led to the notion that Pch2 nucleolar localization could be important for the meiotic recombination checkpoint. Here we investigate how Pch2 chromosomal distribution impacts checkpoint function. We have generated and characterized several mutations that alter Pch2 localization pattern resulting in aberrant Hop1 distribution and compromised meiotic checkpoint response. Besides the AAA+ signature, we have identified a basic motif in the extended N-terminal domain critical for Pch2’s checkpoint function and localization. We have also examined the functional relevance of the described Orc1-Pch2 interaction. Both proteins colocalize in the rDNA, and Orc1 depletion during meiotic prophase prevents Pch2 targeting to the rDNA allowing unwanted Hop1 accumulation on this region. However, Pch2 association with SC components remains intact in the absence of Orc1. We finally show that checkpoint activation is not affected by the lack of Orc1 demonstrating that, in contrast to previous hypotheses, nucleolar localization of Pch2 is actually dispensable for the meiotic checkpoint.


Meiosis Checkpoint Synapsis Recombination Pch2 Orc1 



We are grateful to David Ontoso, Andrés Clemente, and Shirleen Roeder for reagents. We also thank Isabel Acosta and Sara González-Arranz for the technical assistance, Carlos Vázquez for the advice on microscopy analysis, and José Pérez-Martín and Andrés Clemente for the helpful discussions and ideas.


This work was supported by grants from the Ministry of Economy and Competitiveness (MINECO) of Spain to JAC and PSS (grants BFU2015-64361-P and BFU2015-65417-R, respectively). EH was supported by a predoctoral contract (FPU1502035) from the Ministry of Education of Spain. JAC is supported by a Ramón y Cajal contract (RYC2013-13950). The IBFG is funded in part by an institutional grant from Junta de Castilla y León (CLU-2017-03).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

412_2019_696_MOESM1_ESM.pdf (2.5 mb)
ESM 1 (PDF 2571 kb)


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© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Instituto de Biología Funcional y Genómica (IBFG)Consejo Superior de Investigaciones Científicas (CSIC) and University of SalamancaSalamancaSpain
  2. 2.Departamento de Microbiología y GenéticaUniversity of SalamancaSalamancaSpain
  3. 3.Instituto de Tecnologías BiomédicasHospital Universitario de CanariasLa LagunaSpain
  4. 4.Department of Cellular and Molecular Biology, Centro de Investigaciones BiológicasConsejo Superior de Investigaciones Científicas (CSIC)MadridSpain

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