Lipofuscinoses
|
[MIM 204 200, 204 500, 256 730, 600 143, 609 055, 610 127]
(Ceroid-lipofuscinoses)
Group of Lysosomal Storage Disease. Generally autosomal recessive transmission. Prevalence: 1/12500. Intralysosomal accumulation of lipofuscin and ceroid . Nine varieties (13 genes) have been described: all combine progressive dementia, loss of vision, seizures and motor problems. They were conventionally classified according to their time of onset and the order of appearance of the symptoms. Their genetic and allelic heterogeneity required the development of a new classification (table) which takes into account the responsible gene and the age at the onset of the symptoms.
Three deficient enzymes have been identified so far:
- palmitoyl-protein thioesterase (PPT-1 gene on 1p32)
- tripeptidyl-peptidase (TPP-1 gene on 11p15)
- cathepsin (CTSD gene on 11p15.5)
Phenotype |
proportion |
gene |
age of onset |
first symptoms |
congenital |
rare |
SDLC |
perinatal period |
microcephaly, seizures |
infantile |
frequent rare classic frequent in Finland |
PPT-1 KCTD7 TPP-1 CLN5 |
6 mo-2 yr 2-4 years 4-7 years |
cognitive decline, loss of vision seizures |
late infantile |
rare rare variant rare variant very rare variant rare variant frequent classic rare classic |
CLN6 MSFD8 CLN8 SDLC PPTP-1 CLN3 PPT-1 |
18 mo-8 yr 3 - 7.5 yr 4-10 yr |
cognitive decline, convulsions, loss of vision |
juvenile |
rare rare rare |
TPP-1 CLN9 ATP13A2 |
|
neuropsychiatric disorders |
northern epilepsy |
frequent in Finland |
CLN8 |
5-10 years |
seizures, cognitive decline, sometimes loss of vision |
adult |
rare Kufs disease |
CTSD, PPT-1, CLN3, CLN5, CLN6, CTSF, GRN |
15-50 years |
type A: cognitive decline, epilepsy type B: behavior disorders |
autosomal dominant adult |
unknown Parry disease |
DNAJC5 |
|
|
The best-known are:
- Haltia-Santavuori type [Hagberg-Santavuori-Haltia] (chromosome 13q31.32): onset between 4 and 7 years of age; epilepsy, polymyoclonia, ataxia, dementia
- late infantile Finnish type [MIM 256 731, 601 780], CLN5: onset between 4.5 and 7 years of age
- late infantile form CLN 6: loss of vision and seizures are the initial symptoms
- CLN7: vision loss and seizures are the initial symptoms
- CLN8: earlier: onset between 2 and 6 years of age
Experimental treatment: selenium-rich diet; studies of phase 1 of intracerebral and intraventricular transplantation of cerebral stem cells in children with infantile or late-infantile forms. For the CLN2 form: intracerebroventricular injections (through an Ommaya's reservoir) of cerliponase-alpha to slow the evolution. Risk of fever, vomiting or anaphylactic reaction.
Anesthetic implications:
epilepsy, behavioral disorders. If case of CLN3 mutation: preoperative cardiac evaluation, early in adolescence: disorders of intracardiac conduction, ventricular hypertrophy ? Increased risk of drug-induced fever with rhabdomyolysis similar to neuroleptic malignant syndrome or serotonin syndrome in classic juvenile (CLN3).
Treatment of epilepsy: carbamazepine, phenytoin and lamotrigine may aggravate epilepsy; valproic acid can cause excessive sedation.
For the infantile form, risk of hypothermia and sinus bradycardia under anaesthesia, especially as soon as clinical signs of the disease are present.
References :
Updated: October 2022