Considerable MHC diversity suggests that the functional extinction of baiji is not related to population genetic collapse.
To further extend our understanding of the mechanism causing the current nearly extinct status of the baiji (Lipotes vexillifer), one of the most critically endangered species in the world, genetic diversity at the major histocompatibility complex (MHC) class II DRB locus was investigated in the bai...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2012-01-01
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| Series: | PLoS ONE |
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22272349/?tool=EBI |
| _version_ | 1818991840784809984 |
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| author | Shixia Xu Jianfeng Ju Xuming Zhou Lian Wang Kaiya Zhou Guang Yang |
| author_facet | Shixia Xu Jianfeng Ju Xuming Zhou Lian Wang Kaiya Zhou Guang Yang |
| author_sort | Shixia Xu |
| collection | DOAJ |
| description | To further extend our understanding of the mechanism causing the current nearly extinct status of the baiji (Lipotes vexillifer), one of the most critically endangered species in the world, genetic diversity at the major histocompatibility complex (MHC) class II DRB locus was investigated in the baiji. Nine highly divergent DRB alleles were identified in 17 samples, with an average of 28.4 (13.2%) nucleotide difference and 16.7 (23.5%) amino acid difference between alleles. The unexpectedly high levels of DRB allelic diversity in the baiji may partly be attributable to its evolutionary adaptations to the freshwater environment which is regarded to have a higher parasite diversity compared to the marine environment. In addition, balancing selection was found to be the main mechanisms in generating sequence diversity at baiji DRB gene. Considerable sequence variation at the adaptive MHC genes despite of significant loss of neutral genetic variation in baiji genome might suggest that intense selection has overpowered random genetic drift as the main evolutionary forces, which further suggested that the critically endangered or nearly extinct status of the baiji is not an outcome of genetic collapse. |
| first_indexed | 2024-12-20T20:16:40Z |
| format | Article |
| id | doaj.art-1d5c5cdf593f474e979f06d27512db46 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-20T20:16:40Z |
| publishDate | 2012-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-1d5c5cdf593f474e979f06d27512db462022-12-21T19:27:42ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0171e3042310.1371/journal.pone.0030423Considerable MHC diversity suggests that the functional extinction of baiji is not related to population genetic collapse.Shixia XuJianfeng JuXuming ZhouLian WangKaiya ZhouGuang YangTo further extend our understanding of the mechanism causing the current nearly extinct status of the baiji (Lipotes vexillifer), one of the most critically endangered species in the world, genetic diversity at the major histocompatibility complex (MHC) class II DRB locus was investigated in the baiji. Nine highly divergent DRB alleles were identified in 17 samples, with an average of 28.4 (13.2%) nucleotide difference and 16.7 (23.5%) amino acid difference between alleles. The unexpectedly high levels of DRB allelic diversity in the baiji may partly be attributable to its evolutionary adaptations to the freshwater environment which is regarded to have a higher parasite diversity compared to the marine environment. In addition, balancing selection was found to be the main mechanisms in generating sequence diversity at baiji DRB gene. Considerable sequence variation at the adaptive MHC genes despite of significant loss of neutral genetic variation in baiji genome might suggest that intense selection has overpowered random genetic drift as the main evolutionary forces, which further suggested that the critically endangered or nearly extinct status of the baiji is not an outcome of genetic collapse.https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22272349/?tool=EBI |
| spellingShingle | Shixia Xu Jianfeng Ju Xuming Zhou Lian Wang Kaiya Zhou Guang Yang Considerable MHC diversity suggests that the functional extinction of baiji is not related to population genetic collapse. PLoS ONE |
| title | Considerable MHC diversity suggests that the functional extinction of baiji is not related to population genetic collapse. |
| title_full | Considerable MHC diversity suggests that the functional extinction of baiji is not related to population genetic collapse. |
| title_fullStr | Considerable MHC diversity suggests that the functional extinction of baiji is not related to population genetic collapse. |
| title_full_unstemmed | Considerable MHC diversity suggests that the functional extinction of baiji is not related to population genetic collapse. |
| title_short | Considerable MHC diversity suggests that the functional extinction of baiji is not related to population genetic collapse. |
| title_sort | considerable mhc diversity suggests that the functional extinction of baiji is not related to population genetic collapse |
| url | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22272349/?tool=EBI |
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