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Titolo:
DEVELOPMENTAL CONSTRAINTS IN REGRESSIVE EVOLUTION - STUDIES OF THE EXPRESSION OF THE GAMMA(S)-CRYSTALLIN GENE IN THE DEVELOPING LENS OF CAVE-DWELLING ASTYANAX-FASCIATUS (CUVIER, 1819) (TELEOSTEI, CHARACIDAE) BY IN-SITU HYBRIDIZATION
Autore:
LANGECKER TG; WILKENS H; SCHMALE H;
Indirizzi:
UNIV HAMBURG,INST ZOOL,MARTIN LUTHER KING PL 3 D-20146 HAMBURG GERMANY UNIV HAMBURG,ZOOL MUSEUM D-20146 HAMBURG GERMANY UNIV HAMBURG,INST ZELLBIOL & KLIN NEUROBIOL D-20251 HAMBURG GERMANY
Titolo Testata:
Journal of zoological systematics and evolutionary research
fascicolo: 3, volume: 33, anno: 1995,
pagine: 123 - 128
SICI:
0947-5745(1995)33:3<123:DCIRE->2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPALAX-EHRENBERGI; VISUAL-SYSTEM; PINEAL ORGAN; MOLE RAT; CRYSTALLINS; EYE; RECRUITMENT; ONTOGENY; PROTEINS;
Keywords:
LENS; CRYSTALLIN GENE; DEVELOPMENTAL CONSTRAINTS; CAVE FISH; ASTYANAX FASCIATUS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
T.G. Langecker et al., "DEVELOPMENTAL CONSTRAINTS IN REGRESSIVE EVOLUTION - STUDIES OF THE EXPRESSION OF THE GAMMA(S)-CRYSTALLIN GENE IN THE DEVELOPING LENS OF CAVE-DWELLING ASTYANAX-FASCIATUS (CUVIER, 1819) (TELEOSTEI, CHARACIDAE) BY IN-SITU HYBRIDIZATION", Journal of zoological systematics and evolutionary research, 33(3), 1995, pp. 123-128

Abstract

The early morphogenesis of the lens and the expression of the gamma(s)-crystallin gene was studied in epigean Astyanax fasciatus and its cave-dwelling derivative. At early stages, the lens of the cave fish develops in a way that is similar to the epigean form. Later, the developmental timing is delayed and growth ceases in the cave-fish lens. Withthe beginning of cytodifferentiation, the development of the lens breaks down. Crystallin lens fibres are not produced at any time and the gamma(s)-crystallin gene, which is transcribed during a limited periodin the lens of epigean fishes, is not active in cave specimens. This study confirms earlier immunofluorescence observations that demonstrated the lack of crystallin proteins in the cave-fish lens, but is in contrast to results on the blind mole rat, which showed a persistence offunctioning crystallins in the degenerated lens of this species. The significance of developmental constraints in regressive evolution is discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 12:54:59