Skip to main content
Log in

Non-Mendelian segregation and transmission drive of B chromosomes

  • Review
  • Published:
Chromosome Research Aims and scope Submit manuscript

Abstract

Selfish genetic elements (SGE) get a transmission advantage (drive) thanks to their non-Mendelian inheritance. Here I identify eight steps during the reproductive cycle that can be subverted by SGEs to thrive in natural populations. Even though only three steps occur during meiosis, most cases of segregation distortion are considered “meiotic drive sensu lato.” As this is a source of unnecessary contradictions, I suggest always using the term “transmission ratio distortion” (TRD). Chromosomal SGEs (e.g., B chromosomes) exhibit almost all types of TRD. In plants, the best-studied type of TRD for B chromosomes occurs post-meiotically during male gametophyte maturation. However, in animals, the two main types are pre-meiotic and meiotic TRDs, in all cases associated with gonotaxis (i.e., a preference of B chromosomes for germ cells). Frequently, TRD drivers in genic SGEs (e.g., t-alleles and segregation distorters in Drosophila) are paralogous copies of genes from the standard genome, whereas their targets can be other genes or satellite DNA (satDNA). As B chromosomes are often rich in satDNA and contain paralogous copies of A chromosome genes, perhaps their drive mechanisms are similar to those of genic SGEs. So far, the only association between a B chromosome gene and TRD is the gene haplodizer in Nasonia vitripennis. The discovery of B-genes controlling B-drive in other species does not appear to be far off, but experimental crosses will be needed to simultaneously test the TRD of a given B chromosome and the expression of its genes.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3

Similar content being viewed by others

Abbreviations

APC/C:

Anaphase promoting complex or cyclosome

NGS:

Next-generation sequencing

PSR:

Paternal sex ratio

RNAi:

RNA interference pathway

satDNA:

Satellite DNA

Sd:

Segregation distorter

SGE:

Selfish genetic element

TRD:

Transmission ratio distortion

References

Download references

Acknowledgements

I am highly grateful to all the researchers who have co-authored my publications on B chromosomes for more than 40 years, as well as the University of Granada, Junta de Andalucía and the Spanish Government for providing us the necessary funds. I am also grateful to Andreas Houben and an anonymous reviewer for useful comments and David Martinez for English corrections.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Juan Pedro M. Camacho.

Ethics declarations

Competing interests

The author declares no competing interests.

Additional information

Responsible Editors: Stacey Hanlon and Amanda Larracuente

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Camacho, J.P.M. Non-Mendelian segregation and transmission drive of B chromosomes. Chromosome Res 30, 217–228 (2022). https://doi.org/10.1007/s10577-022-09692-7

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10577-022-09692-7

Keywords

Navigation