Frequent recombination in Cynoglossus abbreviatus (Pleuronectiformes: Cynoglossidae) ribosomal 18S rDNA

The conventional theory of concerted evolution has been used to explain the lack of sequence variation in ribosomal RNA (rRNA) genes across diverse eukaryotic species. However, recent investigations into rRNA genes in flatfish genome have resulted in controversial findings. This study focuses on 18S...

Full description

Saved in:
Bibliographic Details
Published in:Acta oceanologica Sinica 2024-08, Vol.43 (8), p.98-103
Main Authors: Gong, Li, Jiang, Tingqi, Hu, Bilin, Wang, Kaixin, Zhang, Nannan, Miao, Zengliang
Format: Article
Language:English
Subjects:
Biological evolution
Climatology
Conserved sequence
Cynoglossidae
Cynoglossus abbreviatus
Earth and Environmental Science
Earth Sciences
Ecology
Engineering Fluid Dynamics
Environmental Chemistry
Evolution
Evolution & development
Evolutionary genetics
Gene conversion
Gene sequencing
Genes
Genomes
Marine & Freshwater Sciences
Marine fishes
Mutation
Nucleotide sequence
Oceanography
Pleuronectiformes
Polymorphism
Protein structure
Pseudogenes
Recombinants
Recombination
rRNA 18S
Secondary structure
Variation
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The conventional theory of concerted evolution has been used to explain the lack of sequence variation in ribosomal RNA (rRNA) genes across diverse eukaryotic species. However, recent investigations into rRNA genes in flatfish genome have resulted in controversial findings. This study focuses on 18S rRNA genes of the widely distributed tongue sole, Cynoglossus abbreviatus (Pleuronectiformes: Cynoglossidae), aiming to explore sequence polymorphism. Five distinct 18S rDNA sequence types (Type A, B, R1, R2, and R3) were identified, suggesting a departure from concerted evolution. A combination of general criteria and variations in highly conserved regions were employed to detect pseudogenes. The results pinpointed Type A sequences as potential pseudogenes due to significant sequence variations and deviations in secondary structure within highly conserved regions. Three types (Type R1, R2, and R3) were identified as recombinants between Type A and B sequences, with simple crossing over and gene conversion as the most likely recombination mechanisms. These findings not only contribute to rRNA pseudogene identification but also shed light on the evolutionary dynamics of rRNA genes in teleost genomes.
ISSN:0253-505X
1869-1099
DOI:10.1007/s13131-024-2291-1