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Journal article
Drastic variation in mitochondrial genome organization between two congeneric species of bird lice (Philopteridae: Ibidoecus)
BMC Genomics, Vol.25, pp.1-9
2024
Abstract
The over 4,100 species of bird lice are classified into 214 genera in the parvorders Amblycera and Ischnocera. Congeneric species of bird lice usually share much similarity in morphology and in mitochondrial (mt) genome organization. Two recent studies, however, reported substantial intra-genus variation in mt genome organization in bird lice. Both the ancestral single-chromosome mt genome and a fragmented mt genome with two or three minichromosomes were observed in the genera Austromenopon and Laemobothrion. To better understand intra-genus variation in mt genome organization, we sequenced the complete mt genome of the white spoonbill louse Ibidoecus plataleae and compared it with that of the glossy ibis feather louse Ibidoecus bisignatus reported previously. We found that I. plataleae had a fragmented mt genome with 12 minichromosomes; each minichromosome was 2,798 to 3,628 bp in size and had 2 to 6 genes. This is in stark contrast to the mt genome of I. bisignatus, which has all genes on a single chromosome, 14,909 bp in size. This is the most drastic intra-genus variation in mt genome organization observed to date in animals, indicating an unprecedented rapid process of mt genome fragmentation in the genus Ibidoecus. The divergence time between I. plataleae and I. bisignatus is currently unknown but is estimated to be less than 23 million years. Either many minichromosal split events occurred after I. plataleae diverged from I. bisignatus, or one minichromosome splits into multiple minichromosomes in a single event. Sequencing and comparing more Ibidoecusi species will help understand the unusual mt genome fragmentation in this genus.The over 4,100 species of bird lice are classified into 214 genera in the parvorders Amblycera and Ischnocera. Congeneric species of bird lice usually share much similarity in morphology and in mitochondrial (mt) genome organization. Two recent studies, however, reported substantial intra-genus variation in mt genome organization in bird lice. Both the ancestral single-chromosome mt genome and a fragmented mt genome with two or three minichromosomes were observed in the genera Austromenopon and Laemobothrion. To better understand intra-genus variation in mt genome organization, we sequenced the complete mt genome of the white spoonbill louse Ibidoecus plataleae and compared it with that of the glossy ibis feather louse Ibidoecus bisignatus reported previously. We found that I. plataleae had a fragmented mt genome with 12 minichromosomes; each minichromosome was 2,798 to 3,628 bp in size and had 2 to 6 genes. This is in stark contrast to the mt genome of I. bisignatus, which has all genes on a single chromosome, 14,909 bp in size. This is the most drastic intra-genus variation in mt genome organization observed to date in animals, indicating an unprecedented rapid process of mt genome fragmentation in the genus Ibidoecus. The divergence time between I. plataleae and I. bisignatus is currently unknown but is estimated to be less than 23 million years. Either many minichromosal split events occurred after I. plataleae diverged from I. bisignatus, or one minichromosome splits into multiple minichromosomes in a single event. Sequencing and comparing more Ibidoecusi species will help understand the unusual mt genome fragmentation in this genus.
Details
- Title
- Drastic variation in mitochondrial genome organization between two congeneric species of bird lice (Philopteridae: Ibidoecus)
- Authors
- Mei-Ling Cao - Hunan Agricultural UniversityYu Nie - Hunan University of Environment and Biology (China)Xi-Long Yi - Hunan Agricultural UniversityJun Xiong - Hunan Agricultural UniversityWei Wang - University of the Sunshine Coast, Queensland, Centre for BioinnovationYuan-Ping Deng - Hunan Agricultural UniversityYi-Tian Fu - Hunan Agricultural UniversityGuo-Hua Liu (Corresponding Author) - Hunan Agricultural UniversityRenfu Shao (Corresponding Author) - University of the Sunshine Coast, Queensland, Centre for Bioinnovation
- Publication details
- BMC Genomics, Vol.25, pp.1-9
- Publisher
- BioMed Central Ltd.
- Date published
- 2024
- DOI
- 10.1186/s12864-024-11005-7
- ISSN
- 1471-2164
- Copyright note
- This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
- Data Availability
- The sequence data generated in this study have been deposited in GenBank (accession numbers ON585561 -72).
- Grant note
- This study was supported by the National Natural Science Foundation of China (grant No. 32172884), the National Parasitic Resources Center (grant No. 2019-194-30), the Hunan Provincial Natural Science Foundation of China (Grant No. 2023JJ5005), the Hunan Natural Science Foundation Youth Fund project (grant no. 2024JJ6548) and Innovation Project of Hunan Agricultural University, China (grant No. 21C12).
- Organisation Unit
- School of Science, Technology and Engineering; Centre for Bioinnovation
- Language
- English
- Record Identifier
- 991079398602621
- Output Type
- Journal article
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