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Published in: Journal of Neuro-Oncology 1/2014

01-08-2014 | Laboratory Investigation

Alternative lengthening of telomeres in neuroblastoma cell lines is associated with a lack of MYCN genomic amplification and with p53 pathway aberrations

Authors: Ahsan S. Farooqi, Rebecca A. Dagg, L. Mi Rim Choi, Jerry W. Shay, C. Patrick Reynolds, Loretta M. S. Lau

Published in: Journal of Neuro-Oncology | Issue 1/2014

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Abstract

Alternative lengthening of telomeres (ALT) is a telomerase-independent telomere length maintenance mechanism that enables the unlimited proliferation of a subset of cancer cells. Some neuroblastoma (NB) tumors appear to maintain telomere length by activating ALT. Of 40 NB cell lines, we identified four potential ALT cell lines (CHLA-90, SK-N-FI, LA-N-6, and COG-N-291) that were telomerase-negative and had long telomeres (a feature of ALT cells). All four cell lines lacked MYCN amplification and were p53 non-functional upon irradiation. Two of these cell lines (CHLA-90 and SK-N-FI) were positive for C-circles (telomeric DNA circles) and ALT-associated promyelocytic leukemia nuclear bodies, both of which are phenotypic characteristics of ALT. Mutation of ATRX (associated with ALT in tumors) was only found in CHLA-90. Thus, the ALT phenotype in NB may not be limited to tumors with ATRX mutations but is associated with a lack of MYCN amplification and alterations in the p53 pathway.
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Metadata
Title
Alternative lengthening of telomeres in neuroblastoma cell lines is associated with a lack of MYCN genomic amplification and with p53 pathway aberrations
Authors
Ahsan S. Farooqi
Rebecca A. Dagg
L. Mi Rim Choi
Jerry W. Shay
C. Patrick Reynolds
Loretta M. S. Lau
Publication date
01-08-2014
Publisher
Springer US
Published in
Journal of Neuro-Oncology / Issue 1/2014
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-014-1456-8

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