Modifications of the retina neuronal populations of the heterozygous mutant small eye mouse, the Sey(Dey).
We analyzed the modifications of the retinal neurons in a heterozygous mutant small eye mouse, the Sey(Dey). This mouse presents a mutation in chromosome 2 which affects the gene Pax6 and other nearby genes, such as the Wt1 gene and the gene of the Reticulocalbin. The eyes of these animals do not have lenses and their retinas present important morphological alterations: in the anterior portion they are joined to the cornea, they are found detached from the pigment epithelium, they present folds that form rosettes in some zones and alteration of the lamination can be observed. The partial loss of the genes affected does not prevent the formation of the different layers of the retina, but does affect its thickness, principally of the plexiform layers; moreover, the internal limiting membrane is found disorganized. All the neuronal populations are present in the retina of these animals and express the same neurochemical markers as the control animals, but the number of Pax6(+) cells is notably reduced. In these retinas a marked disorganization of the distribution of the dendrites and axons is observed and a notable reduction in the axons of ganglion cells. These results suggest that, although it does not appear determinant in the differentiation of the distinct neuronal types of the retina, the partial lack of genes of the heterozygotes +/Sey(Dey) provokes important morphological and neurochemical modifications in the cytoarchitecture of the retina.
Curto
Gloria González
GG
Instituto de Neurociencias de Castilla y León, Departamento de Biología Celular, Universidad de Salamanca, 37007 Salamanca, Spain.
Lara
Juan Manuel
JM
Parrilla
Marta
M
Aijón
José
J
Velasco
Almudena
A
D000818:Animals; D001369:Axons / Q000378:metabolism / Q000473:pathology; D015415:Biomarkers / Q000378:metabolism; D064032:Calbindin 2; D064026:Calbindins; D002135:Calcium-Binding Proteins / Q000235:genetics; D002454:Cell Differentiation / Q000235:genetics; D003712:Dendrites / Q000378:metabolism / Q000473:pathology; D004195:Disease Models, Animal; D005124:Eye Abnormalities / Q000378:metabolism / Q000473:pathology* / Q000503:physiopathology; D005136:Eye Proteins / Q000235:genetics*; D005260:Female; D018507:Gene Expression Regulation, Developmental / Q000235:genetics*; D018398:Homeodomain Proteins / Q000235:genetics*; D008297:Male; D051379:Mice; D008818:Mice, Neurologic Mutants; D009154:Mutation / Q000235:genetics*; D009474:Neurons / Q000378:metabolism / Q000473:pathology*; D000071841:PAX6 Transcription Factor; D051761:Paired Box Transcription Factors / Q000235:genetics*; D010320:Parvalbumins / Q000235:genetics; D051571:Protein Kinase C-alpha / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics*; D012160:Retina / Q000002:abnormalities* / Q000378:metabolism / Q000503:physiopathology; D012165:Retinal Ganglion Cells / Q000378:metabolism / Q000473:pathology; D064030:S100 Calcium Binding Protein G / Q000235:genetics; D014446:Tyrosine 3-Monooxygenase / Q000235:genetics; D025721:WT1 Proteins / Q000235:genetics
D015415:Biomarkers; D064032:Calbindin 2; D064026:Calbindins; D002135:Calcium-Binding Proteins; D005136:Eye Proteins; D018398:Homeodomain Proteins; D000071841:PAX6 Transcription Factor; D051761:Paired Box Transcription Factors; D010320:Parvalbumins; C000605732:Pax6 protein, mouse; D012097:Repressor Proteins; D064030:S100 Calcium Binding Protein G; D025721:WT1 Proteins; C078865:reticulocalbin; D014446:Tyrosine 3-Monooxygenase; D051571:Protein Kinase C-alpha