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Pathological Features of CMT2:
Review GDAP1 CMT Patients
16/12/14
Juan J Vilchez
Servicio de Neurología
H Universitari i Politecnic La Fe-
Valencia
Grupo de Investigación de Enfermedades
Neuromusculares. Instituto de Investigación
Sanitaria La Fe. Valencia
Centro de Investigaciones Biomédicas de
Enfermedades Neurodegenerativas
(CIBERNED). Instituto de Salud Carlos III
CMT2 = Motor Nerve Conduction
Velocity > 38 m/sec
The clasical CMT 2 pathological pattern is characterized by:
• Axonal loss and atrophy
• Clusters of small regenerative fibres
• Scarce and small onion bulb formations
• Ocasional thinly or poorly myelinated fibres
Sivera et al.
CMT_GDAP1 MNCV
Valencian patients
Nerve Biopsy Profile in AR GDAP1 Neuropathy
Nerve biopsy features in AR GDAP1 Neuropathy
Low power electromicroscopy view
Nerve Biopsy from AR GDAP1 Neuropathy patient
Regenerative cluster
Thinly myelianted fibre and cluster of
unmyelinated axon : Bügner band
Myelinated fibre cluster of very small
suze
Nerve biopsy from AR GDAP1 Neuropathy patient
Schwann cell proliferative profiles
Regressive or “denervated onion bulbes
Small or pseudoonion-bulb
Pathological variability between nerve biopsies at different
stages of severity and length duration of the disease
Nerve biopsy features in AD GDAP1 Neuropathy
Nerve biopsy features in AD GDAP1 Neuropathy
Different onion bulb profiles
Nerve biopsy features in AD GDAP1 Neuropathy
Low power electromicroscopy view
Nerve biopsy features in AD GDAP1 Neuropathy
Mitochondrial Abnormalities
AD GDAP1 Neuropathy
Vacuolization
Severe axonal degenerative features : large vacules containig pleomorfic
debris and clustered of swellen and deformed mitochondirion
AD GDAP1 Neuropathy
Mitochondrial accumulation in
paranodal extensions of axons
ndicating abnormal fusion, fission.
Note swelling, fading or condensation
into ‘dense bodies
CONCLUSION
• GDAP1 is characterized by a typical CMT2 nerve
pathology with outstanding features of axonal atrophy
and myelinated fibre depletion.
• There are also presence of Schwann cell dysfunc-tion
like proliferative tendency to form onion bulbs and
some deficiency to complete myelin thickness
• Mitochondrial abormalities is an important pathological
feature particularly in AD forms
• IP; Juan J Vílchez
• Clínico:
Teresa Sevilla Mantecón
Luis Bataller Alberola,
María José Chumillas,
Juan Francisco Vázquez
Nuria Muelas Gómez
Juan J. Vílchez Padilla
Laboratorio:
 Fernando Mayordomo,
 Inmaculada Azorín Villena,
 Lorena Gómez Perpiñá,
 Roger Vílchez Medina,
 Clara Gomis
LABORATORIO DE GENETICA IBV-CESIC / H U LA FE
•Françesc Palau José M Míllán
•Carmen Espinos
•Teresa Jaijo
•Dolores Martínez-Rubio
LABORATORIO DE GENETICA IBV-CESIC / H U LA FE
•Françesc Palau José M Míllán
•Carmen Espinos
•Teresa Jaijo
•Dolores Martínez-Rubio
Unidad 763

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Juan Vilchez - 'Neuropatías, periféricas hereditarias'

  • 1. Pathological Features of CMT2: Review GDAP1 CMT Patients 16/12/14 Juan J Vilchez Servicio de Neurología H Universitari i Politecnic La Fe- Valencia Grupo de Investigación de Enfermedades Neuromusculares. Instituto de Investigación Sanitaria La Fe. Valencia Centro de Investigaciones Biomédicas de Enfermedades Neurodegenerativas (CIBERNED). Instituto de Salud Carlos III
  • 2. CMT2 = Motor Nerve Conduction Velocity > 38 m/sec
  • 3. The clasical CMT 2 pathological pattern is characterized by: • Axonal loss and atrophy • Clusters of small regenerative fibres • Scarce and small onion bulb formations • Ocasional thinly or poorly myelinated fibres
  • 6.
  • 7. Nerve Biopsy Profile in AR GDAP1 Neuropathy
  • 8. Nerve biopsy features in AR GDAP1 Neuropathy Low power electromicroscopy view
  • 9. Nerve Biopsy from AR GDAP1 Neuropathy patient Regenerative cluster Thinly myelianted fibre and cluster of unmyelinated axon : Bügner band Myelinated fibre cluster of very small suze
  • 10. Nerve biopsy from AR GDAP1 Neuropathy patient Schwann cell proliferative profiles Regressive or “denervated onion bulbes Small or pseudoonion-bulb
  • 11. Pathological variability between nerve biopsies at different stages of severity and length duration of the disease
  • 12.
  • 13. Nerve biopsy features in AD GDAP1 Neuropathy
  • 14. Nerve biopsy features in AD GDAP1 Neuropathy Different onion bulb profiles
  • 15. Nerve biopsy features in AD GDAP1 Neuropathy Low power electromicroscopy view
  • 16. Nerve biopsy features in AD GDAP1 Neuropathy Mitochondrial Abnormalities
  • 17.
  • 19. Severe axonal degenerative features : large vacules containig pleomorfic debris and clustered of swellen and deformed mitochondirion AD GDAP1 Neuropathy
  • 20.
  • 21. Mitochondrial accumulation in paranodal extensions of axons ndicating abnormal fusion, fission. Note swelling, fading or condensation into ‘dense bodies
  • 22.
  • 23. CONCLUSION • GDAP1 is characterized by a typical CMT2 nerve pathology with outstanding features of axonal atrophy and myelinated fibre depletion. • There are also presence of Schwann cell dysfunc-tion like proliferative tendency to form onion bulbs and some deficiency to complete myelin thickness • Mitochondrial abormalities is an important pathological feature particularly in AD forms
  • 24. • IP; Juan J Vílchez • Clínico: Teresa Sevilla Mantecón Luis Bataller Alberola, María José Chumillas, Juan Francisco Vázquez Nuria Muelas Gómez Juan J. Vílchez Padilla Laboratorio:  Fernando Mayordomo,  Inmaculada Azorín Villena,  Lorena Gómez Perpiñá,  Roger Vílchez Medina,  Clara Gomis LABORATORIO DE GENETICA IBV-CESIC / H U LA FE •Françesc Palau José M Míllán •Carmen Espinos •Teresa Jaijo •Dolores Martínez-Rubio LABORATORIO DE GENETICA IBV-CESIC / H U LA FE •Françesc Palau José M Míllán •Carmen Espinos •Teresa Jaijo •Dolores Martínez-Rubio Unidad 763