Mutations in Spliceosomal Genes PPIL1 and PRP17 Cause Neurodegenerative Pontocerebellar Hypoplasia with Microcephaly.
Neuron
; 109(2): 241-256.e9, 2021 01 20.
Article
in En
| MEDLINE
| ID: mdl-33220177
ABSTRACT
Autosomal-recessive cerebellar hypoplasia and ataxia constitute a group of heterogeneous brain disorders caused by disruption of several fundamental cellular processes. Here, we identified 10 families showing a neurodegenerative condition involving pontocerebellar hypoplasia with microcephaly (PCHM). Patients harbored biallelic mutations in genes encoding the spliceosome components Peptidyl-Prolyl Isomerase Like-1 (PPIL1) or Pre-RNA Processing-17 (PRP17). Mouse knockouts of either gene were lethal in early embryogenesis, whereas PPIL1 patient mutation knockin mice showed neuron-specific apoptosis. Loss of either protein affected splicing integrity, predominantly affecting short and high GC-content introns and genes involved in brain disorders. PPIL1 and PRP17 form an active isomerase-substrate interaction, but we found that isomerase activity is not critical for function. Thus, we establish disrupted splicing integrity and "major spliceosome-opathies" as a new mechanism underlying PCHM and neurodegeneration and uncover a non-enzymatic function of a spliceosomal proline isomerase.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cerebellar Diseases
/
Spliceosomes
/
Cell Cycle Proteins
/
Peptidylprolyl Isomerase
/
RNA Splicing Factors
/
Microcephaly
/
Mutation
Type of study:
Etiology_studies
/
Incidence_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limits:
Animals
/
Female
/
Humans
/
Male
Language:
En
Journal:
Neuron
Journal subject:
NEUROLOGIA
Year:
2021
Document type:
Article
Affiliation country:
United States