In higher plants as an example, one can see that the era of sequencing of their diploid genomes is coming

01.07.2025
Авторы:
Baymiev Al.Kh. , Chemeris D.A. , Sakhabutdinova A.R. , Kuluev A.R. , Geraschchenkov G.A. , Vershinina Z.R. , Mikhailova E.V. , Baymiev An.Kh. , Kuluev B.R. , Garafutdinov R.R. , Chemeris A.V.
Название:
In higher plants as an example, one can see that the era of sequencing of their diploid genomes is coming
Страницы:
17 – 41
скачано
1 раз(а)


The first complete genome of the plant Arabidopsis thaliana was sequenced a quarter of a century ago, but it took another decade and a half to get it reassembled as a diploid genome in the form of haplotypes. Since then by the end of 2024, functionalized diploid genomes with phased assembly have been sequenced for 258 samples representing 143 species of higher plants belonging to 95 genera from 50 families, and the results have been published in 198 articles. Diploid genomes have been sequenced for species of different ploidy, among which most species are diploids, but there are also triploids, tetraploids, hexaploids, several octaploids, and even nonaploids. Already 30 diploid genomes of different plant species have been assembled at the T2T gapless level. For 7 plant species, the diploid genomes are already supplemented by pangenomes, and for two genera, by a super-pangenome. A noticeable increase in the number of genomes with phased assembly of plant haplotypes occurred in the last couple of years, explained by the improvement of DNA sequencing technologies of new generations and by awareness of the need for such information. Interest in phased genome assembly can be attributed to the fact that currently sequenced genomes are essentially quasi-genomes in which fragments of maternal and paternal genomes are interspersed in a mosaic manner, which makes it difficult to identify genotype–phenotype relationships. In most articles describing the phased assembly of haplotyped genomes, it is emphasized that knowledge of nucleotide sequences of a complete set of chromosomes facilitates determination of biosynthesis pathways of various secondary metabolites and the understanding of mechanisms of heterosis manifestation, allows to improve resistance to various pathogens and adaptability to adverse environmental factors, and helps to determine sex in dioecious plants, to develop advanced breeding programs, and to identify processes that took place during domestication. It can be confidently stated that the genomics of higher organisms and plants in particular has entered the era of sequencing of diploid genomes, despite much greater difficulties with obtaining valid results. At the same time, more than 5,000 plant quasi-genomes are already known for approximately 2 thousand species; however, such quasi-genomes, devoid of phased assembly and consisting of mosaic fragments of parental chromosomes, serve only as a necessary stage of analysis in those species whose genomes have not yet been sequenced in order to subsequently assemble haplotypes in a phased manner by means of chromosomes at the T2T gapless level. The latter is a higher level of establishing the structure of genomes and of their annotation.
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