Itpr1 regulates the formation of anterior eye segment tissues derived from neural crest cells.
Development
; 148(16)2021 08 15.
Article
en En
| MEDLINE
| ID: mdl-34338282
ABSTRACT
Mutations in ITPR1 cause ataxia and aniridia in individuals with Gillespie syndrome (GLSP). However, the pathogenic mechanisms underlying aniridia remain unclear. We identified a de novo GLSP mutation hotspot in the 3'-region of ITPR1 in five individuals with GLSP. Furthermore, RNA-sequencing and immunoblotting revealed an eye-specific transcript of Itpr1, encoding a 218amino acid isoform. This isoform is localized not only in the endoplasmic reticulum, but also in the nuclear and cytoplasmic membranes. Ocular-specific transcription was repressed by SOX9 and induced by MAF in the anterior eye segment (AES) tissues. Mice lacking seven base pairs of the last Itpr1 exon exhibited ataxia and aniridia, in which the iris lymphatic vessels, sphincter and dilator muscles, corneal endothelium and stroma were disrupted, but the neural crest cells persisted after completion of AES formation. Our analyses revealed that the 218-amino acid isoform regulated the directionality of actin fibers and the intensity of focal adhesion. The isoform might control the nuclear entry of transcriptional regulators, such as YAP. It is also possible that ITPR1 regulates both AES differentiation and muscle contraction in the iris.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Aniridia
/
Ataxia Cerebelosa
/
Receptores de Inositol 1,4,5-Trifosfato
/
Discapacidad Intelectual
/
Segmento Anterior del Ojo
/
Mutación
/
Cresta Neural
Límite:
Adolescent
/
Adult
/
Animals
/
Child
/
Child, preschool
/
Female
/
Humans
/
Infant
/
Male
Idioma:
En
Revista:
Development
Asunto de la revista:
BIOLOGIA
/
EMBRIOLOGIA
Año:
2021
Tipo del documento:
Article
País de afiliación:
Japón