Meiotic Drive Mechanisms in Genetic Systems

Meiotic drive refers to the capacity of certain genetic elements to bias their own transmission during gametogenesis, thereby violating the expectation of equal allele segregation. These selfish elements encompass diverse molecular strategies, from toxin–antidote systems that selectively disable gametes lacking the driver allele, to sex-chromosome distorters that skew progeny sex ratios. In fungi, spore killers produce both a diffusible poison and a protective antidote, ensuring that only spores inheriting the driver survive. In insects, distorter loci on sex chromosomes exploit RNA interference or chromatin remodelling to incapacitate gametes bearing competing chromosomes. Such conflicts between driver elements and host genomes have profound evolutionary consequences, influencing fertility, population structure and speciation. At the molecular level, drivers may encode small RNAs, nucleases or transmembrane toxins, while host genomes evolve suppressors that restore Mendelian balance. The study of meiotic drive thus illuminates fundamental aspects of chromosome behaviour, post-translational regulation and genome dynamics. Beyond theoretical interest, these mechanisms inspire gene-drive technologies for pest control and biodiversity management, emphasising the need to understand both efficacy and potential ecological impacts.

Research from Nature Portfolio

Recent studies have revealed how post-translational modification governs the antagonistic actions of poison–antidote drivers. In fission yeast, a single‐gene driver produces a membrane-associated toxin and a structurally similar antidote. Ubiquitination of the antidote by specific ligases directs its sorting from the Golgi network to endosomes, where it neutralises the toxin by co-transport. Disruption of the antidote’s ubiquitination motifs converts it into a lethal agent, demonstrating that regulated protein localisation underpins the duality of driver function. This work proposes that dynamic control of protein trafficking and stability may represent a general principle by which single-gene selfish elements enact meiotic drive.

Meiotic Drive Mechanisms in Genetic Systems publication trend

The graph below shows the total number of articles in meiotic drive mechanisms in genetic systems across all publications each year (not limited to Nature Index journals).

Technical terms

Meiotic drive: A phenomenon in which certain genetic elements manipulate gametogenesis to favour their own transmission over alternative alleles.

Poison–antidote system: A two-component mechanism whereby a toxin disables all gametes and an antidote protects only those inheriting the driver allele.

Spore killer: A fungal selfish element that eliminates spores not inheriting the killer gene, ensuring biased inheritance in ascomycete meiosis.

Transmission ratio distortion: Departure from the expected 50:50 segregation of alleles due to preferential inclusion of one allele in viable gametes.

Hairpin RNA: A structured RNA molecule that forms a duplex stem and loop, processed into small interfering RNAs to silence complementary transcripts.

References

1. Ubiquitination-mediated Golgi-to-endosome sorting determines the toxin-antidote duality of fission yeast wtf meiotic drivers. Nature Communications (2023).
2. Essential and recurrent roles for hairpin RNAs in silencing de novo sex chromosome conflict in Drosophila simulans. PLOS Biology (2023).
3. Combinations of Spok genes create multiple meiotic drivers in Podospora. eLife (2019).