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Titolo:
TRANSCRIPTION OF THE OPSIN GENE IN DEGENERATE EYES OF CAVE-DWELLING ASTYANAX-FASCIATUS (TELEOSTEI, CHARACIDAE) AND OF ITS CONSPECIFIC EPIGEAN ANCESTOR DURING EARLY ONTOGENY
Autore:
LANGECKER TG; SCHMALE H; WILKENS H;
Indirizzi:
UNIV HAMBURG,INST ZOOL,MARTIN LUTHER KING PL 3 W-2000 HAMBURG 13 GERMANY UNIV HAMBURG,MUSEUM W-2000 HAMBURG 13 GERMANY UNIV HAMBURG,INST ZELLBIOCHEM & KLIN NEUROBIOL W-2000 HAMBURG 20 GERMANY
Titolo Testata:
Cell and tissue research
fascicolo: 1, volume: 273, anno: 1993,
pagine: 183 - 192
SICI:
0302-766X(1993)273:1<183:TOTOGI>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVOLUTION; PISCES; FISH;
Keywords:
OPSIN; RETINA; MORPHOGENESIS; REGRESSIVE DEVELOPMENT; EYE REGRESSION; BLINDNESS; IN-SITU HYBRIDIZATION; CAVE FISH; ASTYANAX-FASCIATUS (TELEOSTEI) EYE REGRESSION; CAVE ANIMALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
T.G. Langecker et al., "TRANSCRIPTION OF THE OPSIN GENE IN DEGENERATE EYES OF CAVE-DWELLING ASTYANAX-FASCIATUS (TELEOSTEI, CHARACIDAE) AND OF ITS CONSPECIFIC EPIGEAN ANCESTOR DURING EARLY ONTOGENY", Cell and tissue research, 273(1), 1993, pp. 183-192

Abstract

The early morphogenesis of the degenerate eyes of the Mexican cave fish Astyanax fasciatus and of its conspecific epigean ancestor has beenstudied comparatively using light- and electron-microscopical techniques; the transcription of the opsin gene has been analysed during early ontogeny in both populations by in situ hybridization. The opsin protein is an integral component of the disk membranes of the photoreceptor cells. In epigean specimens, its expression is correlated with the beginning of outer segment formation on the third day of development. Morphogenesis of the cave fish eye is similar to that of the epigean eye until the end of the third day. However, eye growth and morphogenesis of the retina are delayed and sporadic cell death occurs in all retinal layers at the beginning of the second day. Retinal cytodifferentiation breaks off at the point of outer segment formation. Cave specimens are not able to develop regular outer segments at any stage, but the opsin gene is nevertheless expressed in the outer nuclear layer of the developing retina for a limited period of time. On the basis of thecomparative morphology and transcriptional studies of epigean and cave specimens, it is suggested that the eye regression of cave fish is primarily the result of mutations of developmental control genes and not of structural genes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 06:44:06