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Titolo:
Short and mid-wavelength cone distribution in a nocturnal Strepsirrhine primate (Microcebus murinus)
Autore:
Dkhissi-Benyahya, O; Szel, A; Degrip, WJ; Cooper, HM;
Indirizzi:
INSERM, Unite 371, F-69675 Bron, France INSERM Bron France F-69675INSERM, Unite 371, F-69675 Bron, France Semmelweis Univ Med, Dept Human Morphol, H-1094 Budapest, Hungary Semmelweis Univ Med Budapest Hungary H-1094 ol, H-1094 Budapest, Hungary Univ Nijmegen, Nijmegen Ctr Mol Life Sci, Dept Biochem UMC 160, NL-6500 HDNijmegen, Netherlands Univ Nijmegen Nijmegen Netherlands NL-6500 HD 00 HDNijmegen, Netherlands
Titolo Testata:
JOURNAL OF COMPARATIVE NEUROLOGY
fascicolo: 4, volume: 438, anno: 2001,
pagine: 490 - 504
SICI:
0021-9967(20011001)438:4<490:SAMCDI>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
RETINAL GANGLION-CELLS; OLD-WORLD MONKEYS; MARMOSET CALLITHRIX-JACCHUS; VISUAL PIGMENT GENES; COLOR-VISION; MAMMALIAN RETINA; SENSITIVE CONES; MACAQUE MONKEY; LEMUR-CATTA; BUSH-BABY;
Keywords:
photoreceptors; opsin; ganglion cells; retina; rods; prosimian;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
74
Recensione:
Indirizzi per estratti:
Indirizzo: Cooper, HM INSERM, Unite 371, 18 Ave Doyen Lepine, F-69675 Bron, France INSERM 18 Ave Doyen Lepine Bron France F-69675 75 Bron, France
Citazione:
O. Dkhissi-Benyahya et al., "Short and mid-wavelength cone distribution in a nocturnal Strepsirrhine primate (Microcebus murinus)", J COMP NEUR, 438(4), 2001, pp. 490-504

Abstract

Strepsirrhines are of considerable interest for understanding the evolution of cone photoreceptors because they represent the most ancestral living primates. The retina of nocturnal Strepsirrhines is reported to contain a single population of medium/long wavelength (MW/LW) cones whereas short wavelength (SW) cones are totally absent. The area centralis of nocturnal Strepsirrhines also lacks the degree of central specialization seen in the fovea of diurnal primates. In this study of a nocturnal Strepsirrhine, the gray mouse lemur (Microcebus minurinus), we used specific antibodies that recognize SW and MW/LW opsins to determine the presence of different cone subtypesand their distribution in relation to that of rods and ganglion cells. Theresults axe compared to two diurnal Haplorhine species, a New World (Callithrix jacchus) and an Old World (Macaca fascicularis) monkey. In the mouse lemur, both antibodies to MW/LW cone opsin (COS-1 and CERN956) label the same population of cones. A small proportion of SW cones is only stained by the JH455 antiserum whereas the monoclonal OS-2 antibody shows negative staining. These two antibodies label the same SW cone population in other primates, The extracellular matrix of all cones is also labeled by the peanut agglutinin (PNA) lectin. In mouse lemur retinal wholemounts, peak cone density is localized at the area centralis and ranged from 7,500 to 8,000 cones/mm(2). SW cones represent less than 0.2% of the total cone population and are mainly located in the nasal part of the retina. SW cones show an irregular distribution and densities never exceed 49 cones/mm(2). The distribution of neurons in the ganglion cell layer shows a distinct centroperipheral gradient with a peak of 28,000 cells/mm(2) at the area centralis. Rod distribution shows a centroperipheral gradient with the peak (850,000 rods/mm(2)) including and extending slightly dorsal to the area centralis. The theoretical spatial resolution of the mouse lemur (4.9 cycles/degree) is slightly lower to that of other nocturnal primates. The densities of rods, cones, and ganglion cell layer neurons represent a compromise between spatial resolution and sensitivity for both photopic and scotopic vision. J. Comp. Neurol. 438: 490-504,2001. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 14:54:50