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Evidence for L1-associated DNA rearrangements and negligible L1 retrotransposition in glioblastoma multiforme

Carreira, Patricia E ; Ewing, Adam D ; Li, Guibo ; Schauer, Stephanie N ; Upton, Kyle R ; Fagg, Allister C ; Morell, Santiago ; Kindlova, Michaela ; Gerdes, Patricia LU orcid and Richardson, Sandra R , et al. (2016) In Mobile DNA 7. p.1-14
Abstract

BACKGROUND: LINE-1 (L1) retrotransposons are a notable endogenous source of mutagenesis in mammals. Notably, cancer cells can support unusual L1 retrotransposition and L1-associated sequence rearrangement mechanisms following DNA damage. Recent reports suggest that L1 is mobile in epithelial tumours and neural cells but, paradoxically, not in brain cancers.

RESULTS: Here, using retrotransposon capture sequencing (RC-seq), we surveyed L1 mutations in 14 tumours classified as glioblastoma multiforme (GBM) or as a lower grade glioma. In four GBM tumours, we characterised one probable endonuclease-independent L1 insertion, two L1-associated rearrangements and one likely Alu-Alu recombination event adjacent to an L1. These mutations... (More)

BACKGROUND: LINE-1 (L1) retrotransposons are a notable endogenous source of mutagenesis in mammals. Notably, cancer cells can support unusual L1 retrotransposition and L1-associated sequence rearrangement mechanisms following DNA damage. Recent reports suggest that L1 is mobile in epithelial tumours and neural cells but, paradoxically, not in brain cancers.

RESULTS: Here, using retrotransposon capture sequencing (RC-seq), we surveyed L1 mutations in 14 tumours classified as glioblastoma multiforme (GBM) or as a lower grade glioma. In four GBM tumours, we characterised one probable endonuclease-independent L1 insertion, two L1-associated rearrangements and one likely Alu-Alu recombination event adjacent to an L1. These mutations included PCR validated intronic events in MeCP2 and EGFR. Despite sequencing L1 integration sites at up to 250× depth by RC-seq, we found no tumour-specific, endonuclease-dependent L1 insertions. Whole genome sequencing analysis of the tumours carrying the MeCP2 and EGFR L1 mutations also revealed no endonuclease-dependent L1 insertions. In a complementary in vitro assay, wild-type and endonuclease mutant L1 reporter constructs each mobilised very inefficiently in four cultured GBM cell lines.

CONCLUSIONS: These experiments altogether highlight the consistent absence of canonical L1 retrotransposition in GBM tumours and cultured cell lines, as well as atypical L1-associated sequence rearrangements following DNA damage in vivo.

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publishing date
type
Contribution to journal
publication status
published
in
Mobile DNA
volume
7
article number
21
pages
1 - 14
publisher
BioMed Central (BMC)
external identifiers
  • pmid:27843499
  • scopus:84999622498
ISSN
1759-8753
DOI
10.1186/s13100-016-0076-6
language
English
LU publication?
no
id
b008e045-a7e5-41c2-81d3-64b87d399cfc
date added to LUP
2024-06-10 16:15:40
date last changed
2024-06-12 03:06:28
@article{b008e045-a7e5-41c2-81d3-64b87d399cfc,
  abstract     = {{<p>BACKGROUND: LINE-1 (L1) retrotransposons are a notable endogenous source of mutagenesis in mammals. Notably, cancer cells can support unusual L1 retrotransposition and L1-associated sequence rearrangement mechanisms following DNA damage. Recent reports suggest that L1 is mobile in epithelial tumours and neural cells but, paradoxically, not in brain cancers.</p><p>RESULTS: Here, using retrotransposon capture sequencing (RC-seq), we surveyed L1 mutations in 14 tumours classified as glioblastoma multiforme (GBM) or as a lower grade glioma. In four GBM tumours, we characterised one probable endonuclease-independent L1 insertion, two L1-associated rearrangements and one likely Alu-Alu recombination event adjacent to an L1. These mutations included PCR validated intronic events in MeCP2 and EGFR. Despite sequencing L1 integration sites at up to 250× depth by RC-seq, we found no tumour-specific, endonuclease-dependent L1 insertions. Whole genome sequencing analysis of the tumours carrying the MeCP2 and EGFR L1 mutations also revealed no endonuclease-dependent L1 insertions. In a complementary in vitro assay, wild-type and endonuclease mutant L1 reporter constructs each mobilised very inefficiently in four cultured GBM cell lines.</p><p>CONCLUSIONS: These experiments altogether highlight the consistent absence of canonical L1 retrotransposition in GBM tumours and cultured cell lines, as well as atypical L1-associated sequence rearrangements following DNA damage in vivo.</p>}},
  author       = {{Carreira, Patricia E and Ewing, Adam D and Li, Guibo and Schauer, Stephanie N and Upton, Kyle R and Fagg, Allister C and Morell, Santiago and Kindlova, Michaela and Gerdes, Patricia and Richardson, Sandra R and Li, Bo and Gerhardt, Daniel J and Wang, Jun and Brennan, Paul M and Faulkner, Geoffrey J}},
  issn         = {{1759-8753}},
  language     = {{eng}},
  pages        = {{1--14}},
  publisher    = {{BioMed Central (BMC)}},
  series       = {{Mobile DNA}},
  title        = {{Evidence for L1-associated DNA rearrangements and negligible L1 retrotransposition in glioblastoma multiforme}},
  url          = {{http://dx.doi.org/10.1186/s13100-016-0076-6}},
  doi          = {{10.1186/s13100-016-0076-6}},
  volume       = {{7}},
  year         = {{2016}},
}