Meiotic drive and genome evolution in vascular land plants

2024 · doi:10.32942/x2rd0k
preprint OA: closed ⤵ 1 in-corpus citation
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This paper investigates the role of meiotic drive in shaping genome evolution within vascular land plants.

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⚙ AI-generated deep summary by claude@2026-06, 2026-06-13 · read from full text ⓘ

This paper is a preprint review examining how differences in meiotic symmetry between heterosporous and homosporous vascular plants may explain longstanding disparities in chromosome numbers. It contrasts asymmetric meiosis in heterosporous megasporogenesis (where one of four meiotic products becomes the egg) with symmetric meiosis in homosporous lineages (where all products survive), linking asymmetry to the potential for meiotic drive and consequent genomic changes, while symmetric meiosis cannot generate meiotic drive. The authors summarize how meiotic drive could influence chromosome number evolution, genome size, and genome structure, and discuss how the absence of meiotic drive in homosporous plants affects their genome dynamics, while noting that reproductive mode has historically been emphasized and that their focus is meiosis symmetry. This paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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This is a Preprint and has not been peer reviewed. This is version 3 of this Preprint. You must log in to post a comment. There are no comments or no comments have been made public for this article. This is a Preprint and has not been peer reviewed. This is version 3 of this Preprint. Add a Comment You must log in to post a comment. Comments There are no comments or no comments have been made public for this article. In vascular plants, heterosporous lineages typically have fewer chromosomes than homosporous lineages. The underlying mechanism causing this disparity has been debated for over half a century. Although reproductive mode has been identified as critical to these patterns, the symmetry of meiosis during sporogenesis has been overlooked as a potential cause of the difference in chromosome numbers. In most heterosporous plants, meiosis during megasporogenesis is asymmetric, meaning one of the four meiotic products survives to become the egg. Comparatively, meiosis is symmetric in homosporous megasporogenesis and all meiotic products survive. The symmetry of meiosis is important because asymmetric meiosis enables meiotic drive and associated genomic changes, while symmetric meiosis cannot lead to meiotic drive. Meiotic drive is a deviation from Mendelian inheritance where genetic elements are preferentially inherited by the surviving egg cell, and can profoundly impact chromosome (and genome) size, structure, and number. Here we review how meiotic drive impacts chromosome number evolution in heterosporous plants, how the lack of meiotic drive in homosporous plants impacts their genomes, and explore future approaches to understand the role of meiotic drive on chromosome number across land plants. https://doi.org/10.32942/X2RD0K Life Sciences meiotic drive, polyploidy, pteridophytes, homosporous, heterosporous, chromosome number, genome size, whole genome duplicaiton, diploidization Published: 2024-08-13 17:30 Last Updated: 2025-04-03 22:40 CC BY Attribution 4.0 International Language: English

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