Mechanisms of intron gain and loss in Cryptococcus
Background: Genome comparisons across deep phylogenetic divergences have revealed that spliceosomal intron gain and loss are common evolutionary events. However, because of the deep divergences involved in these comparisons, little is understood about how these changes occur, particularly in the cas...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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BioMed Central Ltd
2010
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| Online Access: | http://hdl.handle.net/1721.1/59281 |
| _version_ | 1811079387811938304 |
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| author | Neafsey, Daniel E. Galagan, James E. Sharpton, Thomas J. Taylor, John W. |
| author2 | Broad Institute of MIT and Harvard |
| author_facet | Broad Institute of MIT and Harvard Neafsey, Daniel E. Galagan, James E. Sharpton, Thomas J. Taylor, John W. |
| author_sort | Neafsey, Daniel E. |
| collection | MIT |
| description | Background: Genome comparisons across deep phylogenetic divergences have revealed that spliceosomal intron gain and loss are common evolutionary events. However, because of the deep divergences involved in these comparisons, little is understood about how these changes occur, particularly in the case of intron gain. To ascertain mechanisms of intron gain and loss, we compared five relatively closely related genomes from the yeast Cryptococcus. Results: We observe a predominance of intron loss over gain and identify a relatively slow intron loss rate in Cryptococcus. Some genes preferentially lose introns and a large proportion of intron losses occur in the middle of genes (so called internal intron loss). Finally, we identify a gene that displays a differential number of introns in a repetitive DNA region. Conclusion: Based the observed patterns of intron loss and gain, population resequencing and population genetic analysis, it appears that recombination causes the widely observed but poorly understood phenomenon of internal intron loss and that DNA repeat expansion can create new introns in a population. |
| first_indexed | 2024-09-23T11:14:13Z |
| format | Article |
| id | mit-1721.1/59281 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:14:13Z |
| publishDate | 2010 |
| publisher | BioMed Central Ltd |
| record_format | dspace |
| spelling | mit-1721.1/592812022-09-27T18:05:07Z Mechanisms of intron gain and loss in Cryptococcus Neafsey, Daniel E. Galagan, James E. Sharpton, Thomas J. Taylor, John W. Broad Institute of MIT and Harvard Neafsey, Daniel E. Galagan, James E. Background: Genome comparisons across deep phylogenetic divergences have revealed that spliceosomal intron gain and loss are common evolutionary events. However, because of the deep divergences involved in these comparisons, little is understood about how these changes occur, particularly in the case of intron gain. To ascertain mechanisms of intron gain and loss, we compared five relatively closely related genomes from the yeast Cryptococcus. Results: We observe a predominance of intron loss over gain and identify a relatively slow intron loss rate in Cryptococcus. Some genes preferentially lose introns and a large proportion of intron losses occur in the middle of genes (so called internal intron loss). Finally, we identify a gene that displays a differential number of introns in a repetitive DNA region. Conclusion: Based the observed patterns of intron loss and gain, population resequencing and population genetic analysis, it appears that recombination causes the widely observed but poorly understood phenomenon of internal intron loss and that DNA repeat expansion can create new introns in a population. 2010-10-13T15:59:41Z 2010-10-13T15:59:41Z 2008-01 2007-11 2010-09-03T16:13:34Z Article http://purl.org/eprint/type/JournalArticle 1474-760X 1465-6914 http://hdl.handle.net/1721.1/59281 Genome Biology. 2008 Jan 30;9(1):R24 en http://dx.doi.org/10.1186/gb-2008-9-1-r24 Genome Biology Creative Commons Attribution http://creativecommons.org/licenses/by/2.0 Sharpton et al.; licensee BioMed Central Ltd. application/pdf BioMed Central Ltd BioMed Central Ltd |
| spellingShingle | Neafsey, Daniel E. Galagan, James E. Sharpton, Thomas J. Taylor, John W. Mechanisms of intron gain and loss in Cryptococcus |
| title | Mechanisms of intron gain and loss in Cryptococcus |
| title_full | Mechanisms of intron gain and loss in Cryptococcus |
| title_fullStr | Mechanisms of intron gain and loss in Cryptococcus |
| title_full_unstemmed | Mechanisms of intron gain and loss in Cryptococcus |
| title_short | Mechanisms of intron gain and loss in Cryptococcus |
| title_sort | mechanisms of intron gain and loss in cryptococcus |
| url | http://hdl.handle.net/1721.1/59281 |
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