Journal
FRONTIERS IN BIOSCIENCE-LANDMARK
Volume 17, Issue -, Pages 1345-1361Publisher
FRONTIERS IN BIOSCIENCE INC
DOI: 10.2741/3991
Keywords
LINE; SINE; Alu; Retropseudogene; Non-LTR retrotransposon; SVA; TPRT; Review
Categories
Funding
- National Institutes of Health (NIH) [R01GM079709A, P20RR020152]
- NATIONAL CENTER FOR RESEARCH RESOURCES [P20RR020152] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM079709, P20GM103518] Funding Source: NIH RePORTER
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Mobile elements account for almost half of the mass of the human genome. Only the retroelements from the non-LTR (long terminal repeat) retrotransposon family, which include the LINE-1 (L1) and its non-autonomous partners, are currently active and contributing to new insertions. Although these elements seem to share the same basic amplification mechanism, the activity and success of the different types of retroelements varies. For example, Alu-induced mutagenesis is responsible for the majority of the documented instances of human disease induced by insertion of retroelements. Using copy number in mammals as an indicator, some SINEs have been vastly more successful than other retroelements, such as the retropseudogenes and even L1, likely due to differences in post-insertion selection and ability to overcome cellular controls. SINE and LINE integration can be differentially influenced by cellular factors, indicating some differences between in their amplification mechanisms. We focus on the known aspects of this group of retroelements and highlight their similarities and differences that may significantly influence their biological impact.
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