The tiny germline chromosomes of Paramecium aurelia have an exceptionally high recombination rate and are capped by a new class of Helitrons. Article Swipe
Arnaiz Olivier
,
Guerin
,
Frédéric
,
Couloux, Arnaud
,
Miró-Pina Caridad
,
Pellerin, Guillaume
,
Nekrasova Irina
,
Amselem, Joelle,
,
Aury, Jean Marc
,
Bhullar, Simran
,
Frapporti, Andrea
,
Lerat Emmanuelle
,
Luyten Isabelle
,
Malinsky, Sophie
,
Mathy-Franchet, Nathalie
,
Potekhin Alexey
,
REGNIER, vinciane
,
Sawka-Gądek, Natalia
,
Touzeau, Amandine
,
De Vanssay Augustin
,
zangarelli, coralie
,
Quesneville Hadi
,
Bétermier Mireille
,
Labadie Karine
,
Duret, Laurent
,
Meyer, Eric
,
Duharcourt Sandra
,
Sperling Linda
·
YOU?
·
· 2026
· Open Access
·
· DOI: https://doi.org/10.5281/zenodo.17205921
YOU?
·
· 2026
· Open Access
·
· DOI: https://doi.org/10.5281/zenodo.17205921
Paramecia belong to the ciliate phylum of unicellular eukaryotes characterized by nuclear dimorphism. A diploid germline micronucleus (MIC) transmits genetic information across sexual generations. A polyploid transcriptionally active somatic macronucleus (MAC) develops at each sexual generation from a copy of the MIC through programmed DNA elimination (PDE) of > 30% of germline DNA. PDE requires the domesticated PiggyMac (Pgm) transposase. Assembly of Paramecium germline genomes has presented an enormous challenge owing to the difficulty of MIC isolation. Here we report chromosome-scale short-read MIC assemblies for 7 species from the P. aurelia species complex. We discovered a novel clade of Helitrons, with 9-10 kb transposase ORFs under purifying selection, that have remained active in all P. aurelia lineages. A long-read assembly for P. tetraurelia together with a genetic linkage map provided a nearly telomere-to-telomere assembly. The genome consists of tiny (300 kb – 1.2 Mb) and numerous (~160) germline chromosomes with the highest recombination rate ever reported for a eukaryote (420 cM/Mb). The ends of the chromosomes consist of Helitrons inserted in telomeric C4A2 repeats, forming a distinct genomic compartment that is eliminated very early during MAC development by an unknown, Pgm-independent, mechanism.
Related Topics
Concepts
Biology
Germline
Macronucleus
Genetics
Genome
ORFS
Ploidy
Polyploid
Eukaryote
Evolutionary biology
Somatic cell
Tetrahymena
Centromere
Lineage (genetic)
Paramecium aurelia
Paramecium
Gene duplication
Germline mosaicism
Gene
Phylogenetics
Metadata
- Type
- dataset
- Landing Page
- https://doi.org/10.5281/zenodo.17205921
- OA Status
- green
- OpenAlex ID
- https://openalex.org/W7104697216
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W7104697216Canonical identifier for this work in OpenAlex
- DOI
-
https://doi.org/10.5281/zenodo.17205921Digital Object Identifier
- Title
-
The tiny germline chromosomes of Paramecium aurelia have an exceptionally high recombination rate and are capped by a new class of Helitrons.Work title
- Type
-
datasetOpenAlex work type
- Publication year
-
2026Year of publication
- Publication date
-
2026-09-26Full publication date if available
- Authors
-
Arnaiz Olivier, Guerin , Frédéric, Couloux, Arnaud, Miró-Pina Caridad, Pellerin, Guillaume, Nekrasova Irina, Amselem, Joelle, , Aury, Jean Marc, Bhullar, Simran, Frapporti, Andrea, Lerat Emmanuelle, Luyten Isabelle, Malinsky, Sophie, Mathy-Franchet, Nathalie, Potekhin Alexey, REGNIER, vinciane, Sawka-Gądek, Natalia, Touzeau, Amandine, De Vanssay Augustin, zangarelli, coralie, Quesneville Hadi, Bétermier Mireille, Labadie Karine, Duret, Laurent, Meyer, Eric, Duharcourt Sandra, Sperling LindaList of authors in order
- Landing page
-
https://doi.org/10.5281/zenodo.17205921Publisher landing page
- Open access
-
YesWhether a free full text is available
- OA status
-
greenOpen access status per OpenAlex
- OA URL
-
https://doi.org/10.5281/zenodo.17205921Direct OA link when available
- Concepts
-
Biology, Germline, Macronucleus, Genetics, Genome, ORFS, Ploidy, Polyploid, Eukaryote, Evolutionary biology, Somatic cell, Tetrahymena, Centromere, Lineage (genetic), Paramecium aurelia, Paramecium, Gene duplication, Germline mosaicism, Gene, PhylogeneticsTop concepts (fields/topics) attached by OpenAlex
- Cited by
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0Total citation count in OpenAlex
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