Evolution of Plant B Chromosome Enriched Sequences

Marques, André; Klemme, Sonja; Houben, Andreas

doi:10.20944/preprints201809.0470.v1

2018

DOI: 10.20944/preprints201809.0470.v1

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Evolution of Plant B Chromosome Enriched Sequences

André Marques

Sonja Klemme

Andreas Houben

Abstract: B chromosomes are supernumerary chromosomes which are found in addition to the normal standard chromosomes (A chromosomes). B chromosomes are well known to accumulate several types of repeats. Although the evolution of B chromosomes has been subject of numerous studies, the mechanisms of accumulation and evolution of repetitive sequences is not fully understood. Recently, new genomic approaches have shed light on the origin and accumulation of different classes of repetitive sequences in the process of B chrom… Show more

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Cited by 7 publications

References 84 publications

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The Modern View of B Chromosomes Under the Impact of High Scale Omics Analyses

Ahmad

Martins

2019

Cells

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Supernumerary B chromosomes (Bs) are extra karyotype units in addition to A chromosomes, and are found in some fungi and thousands of animals and plant species. Bs are uniquely characterized due to their non-Mendelian inheritance, and represent one of the best examples of genomic conflict. Over the last decades, their genetic composition, function and evolution have remained an unresolved query, although a few successful attempts have been made to address these phenomena. A classical concept based on cytogenetics and genetics is that Bs are selfish and abundant with DNA repeats and transposons, and in most cases, they do not carry any function. However, recently, the modern quantum development of high scale multi-omics techniques has shifted B research towards a new-born field that we call “B-omics”. We review the recent literature and add novel perspectives to the B research, discussing the role of new technologies to understand the mechanistic perspectives of the molecular evolution and function of Bs. The modern view states that B chromosomes are enriched with genes for many significant biological functions, including but not limited to the interesting set of genes related to cell cycle and chromosome structure. Furthermore, the presence of B chromosomes could favor genomic rearrangements and influence the nuclear environment affecting the function of other chromatin regions. We hypothesize that B chromosomes might play a key function in driving their transmission and maintenance inside the cell, as well as offer an extra genomic compartment for evolution.

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The Modern View of B Chromosomes Under the Impact of High Scale Omics Analyses

Ahmad

Martins

2019

Cells

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Correction: Marques, A. et al. Evolution of Plant B Chromosome Enriched Sequences. Genes 2018, 9, 515

Marques

Klemme

Houben

2019

Genes

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Sequence Expression of Supernumerary B Chromosomes: Function or Fluff?

Benetta

Akbari

Ferree

2019

Genes

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B chromosomes are enigmatic heritable elements found in the genomes of numerous plant and animal species. Contrary to their broad distribution, most B chromosomes are non-essential. For this reason, they are regarded as genome parasites. In order to be stably transmitted through generations, many B chromosomes exhibit the ability to “drive”, i.e., they transmit themselves at super-Mendelian frequencies to progeny through directed interactions with the cell division apparatus. To date, very little is understood mechanistically about how B chromosomes drive, although a likely scenario is that expression of B chromosome sequences plays a role. Here, we highlight a handful of previously identified B chromosome sequences, many of which are repetitive and non-coding in nature, that have been shown to be expressed at the transcriptional level. We speculate on how each type of expressed sequence could participate in B chromosome drive based on known functions of RNA in general chromatin- and chromosome-related processes. We also raise some challenges to functionally testing these possible roles, a goal that will be required to more fully understand whether and how B chromosomes interact with components of the cell for drive and transmission.

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Evolution of Plant B Chromosome Enriched Sequences

Cited by 7 publications

References 84 publications

The Modern View of B Chromosomes Under the Impact of High Scale Omics Analyses

The Modern View of B Chromosomes Under the Impact of High Scale Omics Analyses

Correction: Marques, A. et al. Evolution of Plant B Chromosome Enriched Sequences. Genes 2018, 9, 515

Sequence Expression of Supernumerary B Chromosomes: Function or Fluff?

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