Contents - College of Medical and Dental Sciences - University of ...
Contents - College of Medical and Dental Sciences - University of ...
Contents - College of Medical and Dental Sciences - University of ...
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The 11 th International Workshop on KSHV & Related Agents, Birmingham, UK<br />
Gene Expression I Abstract 32<br />
PROFILING OF CELLULAR AND VIRAL MICRORNAS IN KAPOSI SARCOMA AND<br />
VIRAL-ASSOCIATED LYMPHOMA<br />
Andrea J. O’Hara*, Bruce J. Dezube # , William Harrington Jr.^, Blossom Damania*, <strong>and</strong><br />
Dirk P. Dittmer^*<br />
*Department <strong>of</strong> Microbiology <strong>and</strong> Immunology, Lineberger Comprehensive Cancer<br />
Center, <strong>and</strong> Curriculum in Genetics <strong>and</strong> Molecular Biology, <strong>University</strong> <strong>of</strong> North Carolina at<br />
Chapel Hill, Chapel Hill, NC 27599; # Beth Israel Deaconess <strong>Medical</strong> Center; ^Sylvester<br />
Comprehensive Cancer Center, <strong>University</strong> <strong>of</strong> Miami.<br />
Abstract<br />
MicroRNAs are regulated by gene alteration at the DNA level, transcriptional regulation,<br />
<strong>and</strong> mature miRNA processing via Dicer. Thus far, few studies have simultaneously<br />
assessed all three levels <strong>of</strong> regulation. Using real-time quantitative polymerase chain<br />
reaction (QPCR)-based arrays, changes in gene copy number, pre-miRNA <strong>and</strong> mature<br />
miRNA levels for a large set <strong>of</strong> primary effusion lymphomas (PELs) <strong>and</strong> primary Kaposi<br />
Sarcoma biopsies (KS) has been determined; this includes miRNA gene alterations <strong>and</strong><br />
concordant changes in pre-miRNA <strong>and</strong> mature miRNA expression levels. The real-time<br />
QPCR based approach confirmed many <strong>of</strong> the KSHV viral <strong>and</strong> cellular miRNAs previously<br />
cloned from PEL. However, array-based pr<strong>of</strong>iling also uncovered many novel PEL–specific<br />
miRNAs, since cloning-based approaches are not always saturating. The miRNA<br />
expression pattern for neither viral nor cellular miRNAs has hitherto been determined for<br />
KS. Furthermore, comprehensive SNP analysis <strong>of</strong> the viral miRNAs has been pr<strong>of</strong>iled to<br />
further examine the effects <strong>of</strong> sequence <strong>and</strong> processing. This defines the miRNA<br />
signature <strong>of</strong> PEL, KS, KSHV-infected cancers <strong>and</strong> experimental models. It shows that the<br />
transcriptional regulation <strong>of</strong> pre-miRNA as well as mature miRNA levels contribute nonredundant<br />
information that can be used in the classification <strong>of</strong> human tumors.<br />
Presenting author Email: ohara@unc.edu<br />
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