NUBPL Foundation

What is NUBPL?

NUBPL, acronym for Nucleotide-binding protein-like

Gene Function: It is an iron-sulfur (Fe/S) protein that, in humans, is encoded by the NUBPL gene. It has an early role in the assembly of the mitochondrial complex I assembly pathway.

Mutations in the NUBPL gene may cause a rare form of mitochondrial complex I disorder.

Typical clinical signs and symptoms:

  • Age of onset 1-2 years old
  • Developmental delay: Some patients
  • Delay: Motor; Unable to walk
  • Speech: Abnormal (Dysarthria)
  • Eyes: Strabismus; Nystagmus
  • Ataxia: Trunk & Limbs
  • Contractures
  • Spasticity
  • Cognitive: Normal or Reduced
  • Myopathy
  • Other organs: Normal
  • Course: Progressive, continuous or episodic

Laboratory signs:

  • MRI: Leukoencephalopathy with abnormal:
    • Cerebellar cortex: Progressive
    • Cerebral white matter, deep: May resolve
    • Corpus callosum: May resolve
      *Although these are characteristic MRI findings, there are others including abnormalities in the grey matter of the cerebellum, as is discussed in Hope for Katherine Belle.
  • Lactate: Serum normal or high; CSF normal or high
  • NUBPL protein: Reduced
  • Muscle biopsy
    • Histology: Ragged red fibers; No COX- fibers
    • Biochemistry: Complex I deficiency
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