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Neuron-specific knockdown of Drosophila HADHB induces a shortened lifespan, deficient locomotive ability, abnormal motor neuron terminal morphology and learning disability.

  • Jialin Li‎ et al.
  • Experimental cell research‎
  • 2019‎

Mutations in the HADHB gene induce dysfunctions in the beta-oxidation of fatty acids and result in a MTP deficiency, which is characterized by clinical heterogeneity, such as cardiomyopathy and recurrent Leigh-like encephalopathy. In contrast, milder forms of HADHB mutations cause the later onset of progressive axonal peripheral neuropathy (approximately 50-80%) and myopathy with or without episodic myoglobinuria. The mechanisms linking neuronal defects in these diseases to the loss of HADHB function currently remain unclear. Drosophila has the CG4581 (dHADHB) gene as a single human HADHB homologue. We herein established pan-neuron-specific dHADHB knockdown flies and examined their phenotypes. The knockdown of dHADHB shortened the lifespan of flies, reduced locomotor ability and also limited learning abilities. These phenotypes were accompanied by an abnormal synapse morphology at neuromuscular junctions (NMJ) and reduction in both ATP and ROS levels in central nervous system (CNS). The Drosophila NMJ synapses are glutamatergic that is similar to those in the vertebrate CNS. The present results reveal a critical role for dHADHB in the morphogenesis and function of glutamatergic neurons including peripheral neurons. The dHADHB knockdown flies established herein provide a useful model for investigating the pathological mechanisms underlying neuropathies caused by a HADHB deficiency.


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