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Sdhd and SDHD/H19 knockout mice do not develop paraganglioma or pheochromocytoma
Jean-Pierre Bayley1, Ivonne van Minderhout, Pancras C W Hogendoorn
1Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands. j.p.l.bayley@lumc.nl
Knocking out the Sdhd gene in mice did not lead to paraganglioma or pheochromocytoma development. This contrasts with human genetics, suggesting the mouse model may not fully replicate these imprinted tumor suppressor gene roles.
Area of Science:
- Mitochondrial biology
- Tumorigenesis
- Genetics
Background:
- Mitochondrial succinate dehydrogenase (SDH) is crucial for cellular respiration.
- Mutations in SDHD are linked to paraganglioma (PGL) and pheochromocytoma (PC) in humans.
- SDHD exhibits an imprinted tumor suppressor phenotype with high penetrance.
Purpose of the Study:
- To investigate the role of Sdhd in tumor development using a mouse knockout model.
- To assess if combined knockout of Sdhd and H19 influences PGL/PC initiation or progression.
Main Methods:
- Generated conventional and heterozygous knockout mice for Sdhd.
- Crossed Sdhd knockout mice with H19 knockout mice.
- Monitored mice for tumor development and pathology throughout their lifespan.
Main Results:
- Homozygous Sdhd knockout resulted in embryonic lethality.
- Neither homozygous nor heterozygous Sdhd knockout mice developed PGL/PC or related pathologies.
- Combined Sdhd/H19 knockout mice showed cardiac hypertrophy but no PGL/PC.
Conclusions:
- Sdhd knockout in mice does not recapitulate the PGL/PC disease phenotype observed in humans.
- H19 does not appear to be an initiator of PGL/PC tumorigenesis in this model.
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