0000000000481783
AUTHOR
Josefine Radke
Human NCL Neuropathology
AbstractThe neuronal ceroid lipofuscinoses (NCL) currently encompass fourteen genetically different forms, CLN1 to CLN14, but are all morphologically marked by loss of nerve cells, particularly in the cerebral and cerebellar cortices, and the cerebral and extracerebral formation of lipopigments. These lipopigments show distinct ultrastructural patterns, i.e., granular, curvilinear/rectilinear and fingerprint profiles. They contain−although to a different degree among the different CLN forms−subunit C of ATP synthase, saposins A and D, and beta-amyloid proteins. Extracerebral pathology, apart from lipopigment formation, which provides diagnostic information, is scant or non-existent. The ret…
G.P.192
After uneventful pregnancies, two newborn siblings, a girl and a boy – another sibling was stillborn – developed inspiratory stridor, hypertrophy of the right cardiac ventricle, reduction in spontaneous movements and mildly elevated creatine kinase. Muscle biopsies at ages of three months and seven weeks were performed and respectively, revealed a 'prepathological' pattern of infantile neurogenic atrophy suggesting spinal muscular atrophy (SMA). However, molecular analyses of SMN (SMA) and IGHMBP2 (SMARD1) genes did not disclose any mutations. Further histochemical staining of the skeletal muscle and heart demonstrated almost complete absence of cytochrome c oxidase while SDH was preserved.…
Autophagic vacuolar myopathy is a common feature of CLN3 disease
Abstract Objective The neuronal ceroid lipofuscinoses (NCL) are genetic degenerative disorders of brain and retina. NCL with juvenile onset (JNCL) is genetically heterogeneous but most frequently caused by mutations of CLN3. Classical juvenile CLN3 includes a rare protracted form, which has previously been linked to autophagic vacuolar myopathy (AVM). Our study investigates the association of AVM with classic, non‐protracted CLN3. Methods Evaluation of skeletal muscle biopsies from three, non‐related patients with classic, non‐protracted and one patient with protracted CLN3 disease by histology, immunohistochemistry, electron microscopy, and Sanger sequencing of the coding region of the CLN…