Genome Fractionation and Loss of Heterozygosity in Hybrids and Polyploids: Mechanisms, Consequences for Selection, and Link to Gene Function

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F21%3A43906079" target="_blank" >RIV/60076658:12310/21:43906079 - isvavai.cz</a>

Alternative codes found

RIV/61389030:_____/21:00551984 RIV/67985904:_____/21:00551984 RIV/60460709:41210/21:88839 RIV/00216208:11310/21:10439327

Result on the web

<a href="https://academic.oup.com/mbe/article/38/12/5255/6355045?login=true" target="_blank" >https://academic.oup.com/mbe/article/38/12/5255/6355045?login=true</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/molbev/msab249" target="_blank" >10.1093/molbev/msab249</a>

Result language

angličtina

Original language name

Genome Fractionation and Loss of Heterozygosity in Hybrids and Polyploids: Mechanisms, Consequences for Selection, and Link to Gene Function

Original language description

Hybridization and genome duplication have played crucial roles in the evolution of many animal and plant taxa. The subgenomes of parental species undergo considerable changes in hybrids and polyploids, which often selectively eliminate segments of one subgenome. However, the mechanisms underlying these changes are not well understood, particularly when the hybridization is linked with asexual reproduction that opens up unexpected evolutionary pathways. To elucidate this problem, we compared published cytogenetic and RNAseq data with exome sequences of asexual diploid and polyploid hybrids between three fish species; Cobitis elongatoides, C taenia, and C tanaitica. Clonal genomes remained generally static at chromosome-scale levels but their heterozygosity gradually deteriorated at the level of individual genes owing to allelic deletions and conversions. Interestingly, the impact of both processes varies among animals and genomic regions depending on ploidy level and the properties of affected genes. Namely, polyploids were more tolerant to deletions than diploid asexuals where conversions prevailed, and genomic restructuring events accumulated preferentially in genes characterized by high transcription levels and GC-content, strong purifying selection and specific functions like interacting with intracellular membranes. Although hybrids were phenotypically more similar to C taenia, we found that they preferentially retained C elongatoides alleles. This demonstrates that favored subgenome is not necessarily the transcriptionally dominant one. This study demonstrated that subgenomes in asexual hybrids and polyploids evolve under a complex interplay of selection and several molecular mechanisms whose efficiency depends on the organism&apos;s ploidy level, as well as functional properties and parental ancestry of the genomic region.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10608 - Biochemistry and molecular biology

Project

<a href="/en/project/GA17-09807S" target="_blank" >GA17-09807S: Why and how animals abandon sex? On the causal role of hybridization in triggering asexual reproduction</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Molecular Biology and Evolution

ISSN

0737-4038

e-ISSN

—

Volume of the periodical

38

Issue of the periodical within the volume

12

Country of publishing house

GB - UNITED KINGDOM

Number of pages

20

Pages from-to

5255-5274

UT code for WoS article

000741368600004

EID of the result in the Scopus database

2-s2.0-85125326991