Classical late-infantile neuronal ceroid lipofuscinosis (LINCL; CLN2) is an inherited neurodegenerative disorder of childhood characterized by seizures, loss of vision, and progressive motor and mental deterioration.
Classic late-infantile NCL (Jansky-Bielschowsky disease) is caused by mutations in a gene encoding a pepstatin-insensitive lysosomal peptidase (CLN2 on chromosome 11p15), and juvenile-onset NCL (Batten disease) is caused by mutations in a gene encoding a 438-amino-acid membrane protein (CLN3 on chromosome 16p12) of unknown function.
These data provide new insights into TPP1 function and represent a valuable resource for constructing improved TPP1 variants for treatment of late infantile neuronal ceroid lipofuscinosis.
We identified a novel nonsense CLN2 mutation (Q509X) in three Italian children with classical late-infantile neuronal ceroid lipofuscinosis (LINCL) from two unrelated families.
Mutations in tripeptidyl-peptidase I (TPP I) underlie the classic late-infantile form of neuronal ceroid lipofuscinoses (CLN2), the most common neurodegenerative disorders of childhood.
As previous reports show that the majority of the TPP1 mutations in NCL resulted in reduction or loss of enzyme activity, we suggest that <i>Dicyostelium</i> could be used as a model system in which to test new reagents that could affect the activity of the protein and ameliorate the disease.
Late-infantile neuronal ceroid lipofuscinosis (LINCL), an autosomal recessively inherited lysosomal storage disorder characterized by autofluorescent inclusions and rapid progression of neurodegeneration, is due to CLN2 gene mutations.
CLN2 disease is a hereditary neurodegenerative disorder resulting from mutations in CLN2, which encodes the soluble lysosomal enzyme tripeptidyl peptidase-1 (TPP1).
Association of the R447H mutation with a delayed onset form of LINCL in two separate families raised the question of whether R447HCLN2 retains residual activity.
Spectrum of ocular manifestations in CLN2-associated batten (Jansky-Bielschowsky) disease correlate with advancing age and deteriorating neurological function.
Most of the patients, 9 of 11 (81.8%), were CLN2 type (late-infantile neuronal ceroid lipofuscinosis or Jansky-Bielschowsky), and 2 patients were the atypical type.
Analysis of archival specimens indicates that several specimens previously classified as LINCL have enzyme activity and thus disease is unlikely to arise from mutations in CLN2.
Furthermore, the assay could be easily combined with a TPP1 enzyme assay (for CLN2 disease) and can be potentially multiplexed with a large panel of additional lysosomal enzyme assays by MS/MS for newborn screening and postscreening analysis.
28 disease-causing missense mutations are analyzed in the light of the TPP1 structure providing insight into the molecular basis of late infantile neuronal ceroid lipofuscinosis.
The late-infantile Batten disease or late-infantile neuronal ceroid lipofuscinosis (LINCL) is an autosomal recessive lysosomal storage disorder caused by mutations in the Cln2 gene leading to deficiency of lysosomal enzyme tripeptidyl peptidase 1 (TPP1).
CLN2 disease (neuronal ceroid lipofuscinosis type 2) is a rare, autosomal recessive, pediatric-onset, rapidly progressive neurodegenerative lysosomal storage disorder caused by tripeptidyl peptidase 1 (TPP1) enzyme deficiency, and is characterized by language delay, seizures, rapid cognitive and motor decline, blindness, and early death.
We update on the spectrum of TPP1 variants associated with CLN2 disease, comprising 131 unique variants from 389 individuals (717 alleles) collected from the literature review, public databases, and laboratory communications.
We have collected 122 late-infantile neuronal ceroid lipofuscinosis (LINCL, CLN2) and 191 juvenile NCL (JNCL, CLN3) cases, diagnosed on the basis of age-at-onset, clinical symptomatology, and pathological findings and representing the most common forms of NCL in the United States, and Europe.
Late Infantile Neuronal Ceroid Lipofuscinosis (LINCL) is a rare neurodegenerative disease caused by mutations in the Cln2 gene that leads to deficiency or loss of function of the tripeptidyl peptidase 1 (TPP1) enzyme.
Further analysis of all reported TPP1 mutations revealed that the LINCL group had a significantly higher frequency of truncating and invariant splice-site mutations than the JNCL group.
Neuronal ceroid lipofuscinosis type 2 (CLN2 disease) is a rare, progressive, fatal neurodegenerative pediatric disorder resulting from deficiencies of the lysosomal enzyme tripeptidyl peptidase 1 that are caused by mutations in TPP1.