Ultrastructural evidence for the origin of the subretinal pigment shield in the compound eye of Drosophila melanogaster.
3D reconstruction
insects
vision
Journal
Journal of morphology
ISSN: 1097-4687
Titre abrégé: J Morphol
Pays: United States
ID NLM: 0406125
Informations de publication
Date de publication:
07 2020
07 2020
Historique:
received:
18
02
2020
revised:
27
04
2020
accepted:
27
04
2020
pubmed:
13
5
2020
medline:
15
12
2020
entrez:
13
5
2020
Statut:
ppublish
Résumé
Little morphological information is available about subretinal pigment shields in insect compound eyes, especially ultrastructural information. The latter is however needed in order to detect possible smallest projections that emanate from pigment-granule-bearing cells and pass through the basal matrix (BM), but that are not visible in light micrographs. Previous work on the subretinal pigment shield in Drosophila melanogaster suggests that the pigment cell population located below the BM is closely associated with secondary and tertiary pigment cells. Whether these cells stay in connection throughout life with the subretinal regions via thin projections that pass through the fenestrae of the BM, or whether the subretinal parts later become separated during eye development remained so far unknown. Our investigation of the periphery of the BM by three-dimensional reconstruction based on serial-sectioning transmission electron microscopy has revealed that the secondary and tertiary pigment cells possess thin projections that pass through the fenestrae of the BM and thus connect the cellular regions above and below the BM in the adult compound eye. The subretinal pigment shield of D. melanogaster is therefore of retinal origin and is not composed of additional subretinal pigment cells. The maintained bond allows the active displacement of pigment granules below the BM during the process of dark and light adaptation of the compound eye.
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
802-807Informations de copyright
© 2020 Wiley Periodicals, Inc.
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