The genetic and metabolic signature of oncocytic transformation implicates HIF1alpha destabilization.

Abstract:

:We previously showed that disruptive complex I mutations in mitochondrial DNA are the main genetic hallmark of oncocytic tumors of the thyroid and kidney. We here report a high frequency of homoplasmic disruptive mutations in a large panel of oncocytic pituitary and head-and-neck tumors. The presence of such mutations implicates disassembly of respiratory complex I in vivo which in turn contributes to the inability of oncocytic tumors to stabilize HIF1alpha and to display pseudo-hypoxia. By utilizing transmitochondrial cytoplasmic hybrids (cybrids), we induced the shift to homoplasmy of a truncating mutation in the mitochondria-coded MTND1 gene. Such shift is associated with a profound metabolic impairment leading to the imbalance of alpha-ketoglutarate and succinate, the Krebs cycle metabolites which are the main responsible for HIF1alpha stabilization. We conclude that the main hallmarks of oncocytic transformation, namely the occurrence of homoplasmic disruptive mutations and complex I disassembly, may explain the benign nature of oncocytic neoplasms through lack of HIF1alpha stabilization.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Porcelli AM,Ghelli A,Ceccarelli C,Lang M,Cenacchi G,Capristo M,Pennisi LF,Morra I,Ciccarelli E,Melcarne A,Bartoletti-Stella A,Salfi N,Tallini G,Martinuzzi A,Carelli V,Attimonelli M,Rugolo M,Romeo G,Gasparre G

doi

10.1093/hmg/ddp566

subject

Has Abstract

pub_date

2010-03-15 00:00:00

pages

1019-32

issue

6

eissn

0964-6906

issn

1460-2083

pii

ddp566

journal_volume

19

pub_type

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