Today's guest post was contributed by Debraj Manna, a postdoctoral researcher and science writer at the Indian Institute of Science in Bangalore, India. Besides his research in non-canonical translation, Debraj is interested in decoding complex scientific discoveries into compelling narratives. He is committed to sharing the stories behind scientific advancements while shedding light on the lives of researchers. You can connect with Debraj on X, LinkedIn, or Bluesky.

The Fungal Genetics and Genomics Series, published in the GSA Journals, brings together work that spans molecular mechanisms, evolutionary insights, quantitative genetics, and applied genomics across the fungal kingdom. As the community prepares for the upcoming 33rd Fungal Genetics Conference, this collection offers a timely reminder of how fungal systems continue to illuminate fundamental biology while driving translational innovation.

Two recent papers in the collection, one in GENETICS and one in G3: Genes|Genomes|Genetics, underscore that breadth.

In GENETICS, Juxiu Chen et al. dissect the role of the Essential 1 (Ess1) protein, a budding yeast ortholog of human PIN1, in telomere biology. PIN1 is well known for modulating telomere maintenance in humans through Telomeric Repeat Binding Factor 1 (TRF1). In Saccharomyces cerevisiae, however, Ess1 operates through a mechanistically distinct pathway. The authors demonstrated that Ess1 is vital for efficient RNA polymerase II transcription termination, repressing TERRA (telomeric repeat-containing RNA), and preventing the accumulation of telomeric R-loops. 

Strikingly, Ess1 does more than regulate transcription. It associates directly with telomeric DNA to promote telomere-end resection. Working in concert with the MRX (Mre11-Rad50-Xrs2) complex, Ess1 facilitates both telomerase-mediated elongation and recombination-dependent survival pathways. When Ess1 is depleted, telomeres shorten, and telomerase-deficient cells undergo accelerated senescence. By functionally linking RNA polymerase II dynamics to telomere processing, this study reveals how a conserved prolyl isomerase (Ess1/PIN1) family coordinates transcriptional control and chromosome-end maintenance to safeguard genome stability across eukaryotes.

A second study published in G3 turns to a very different fungal system: the edible mushroom Lentinula edodes. Xia Zhao et al. provide a transcriptomic roadmap of pileus development, shifting the emphasis away from the traditionally studied stipe elongation stage. Using RNA sequencing across three developmental phases, the team identified 283 conserved, differentially expressed genes that define cap morphogenesis.

Among these, three candidates stand out. Alpha-amylase (α-Amy) likely drives rapid cap expansion by mobilizing glucose reserves. Phosphatidylserine decarboxylase (Psd) supports autophagy via key lipid conversions, and Heat shock protein 70 (HSP70) maintains proteostasis by facilitating the degradation of ubiquitinated protein aggregates. Together, these processes suggest a coordinated reallocation of metabolic and proteostatic resources during maturation. Complementary physiological data—most notably, a pronounced increase in superoxide dismutase activity at maturity—support the idea that cap opening is coupled to a programmed aging trajectory. Beyond developmental insight, this dataset provides actionable targets for molecular breeding of high-quality cultivars.

From chromosome ends in budding yeast to cap architecture in basidiomycetes, these studies exemplify the intellectual range of the Fungal Genetics and Genomics Series. As the field gathers at Fungal 2026 next month, such work highlights why fungal systems remain indispensable for connecting mechanism, evolution, and application in modern genetics.

References

  • The Ess1 prolyl isomerase represses TERRA transcription and promotes telomere replication in Saccharomyces cerevisiae
    Chen J, Yang L, Zhu X, et al. GENETICS. January 2026.

    DOI: 10.1093/genetics/iyag017

  • Identification of Regulatory Candidate Genes for Lentinula edodes Pileus Development Based on Transcriptome Analysis
    Zhao X, Wu CY, You H, et al. G3: Genes | Genomes | Genetics. January 2026.

    DOI: 10.1093/g3journal/jkaf316

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