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Titolo:
ANALYSIS OF THE RETINAS AND OPTIC NERVES OF ACHIASMATIC BELGIAN SHEEPDOGS
Autore:
HOGAN D; WILLIAMS RW;
Indirizzi:
UNIV TENNESSEE,SCH MED,DEPT ANAT & NEUROBIOL,855 MONROE AVE MEMPHIS TN 38163
Titolo Testata:
Journal of comparative neurology
fascicolo: 3, volume: 352, anno: 1995,
pagine: 367 - 380
SICI:
0021-9967(1995)352:3<367:AOTRAO>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
GANGLION-CELL; CORPUS-CALLOSUM; HORSERADISH-PEROXIDASE; CHIASMATIC PATHWAY; RETINOFUGAL AXONS; ALBINO FERRETS; SIAMESE CAT; WOLF RETINA; PROJECTIONS; TOPOGRAPHY;
Keywords:
OPTIC CHIASM; AREA CENTRALIS; NYSTAGMUS; ALBINO; RETINOGENICULATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
D. Hogan e R.W. Williams, "ANALYSIS OF THE RETINAS AND OPTIC NERVES OF ACHIASMATIC BELGIAN SHEEPDOGS", Journal of comparative neurology, 352(3), 1995, pp. 367-380

Abstract

An autosomal recessive mutation carried in a family of black Belgian sheepdogs eliminates the optic chiasm-all retinal ganglion cell axons extend directly into the ipsilateral optic tract. One key issue we aretrying to resolve is whether the retina or the chiasm is the principal site of mutant gene action. In this study, we have examined retinas of mutants to discover any associated changes in retinal structure. Retinas of mutant animals are relatively normal. Inner and outer nuclearlayers are qualitatively indistinguishable from those of normal dogs. The principal difference is that the area centralis of mutants is smaller and has a lower peak ganglion cell density than that of normal dogs (8,100 vs. 10,500/mm(2), P < 0.05). This mutant phenotype is similar to that seen in retinas of Siamese cats and albino ferrets. Beyond area centralis, the central-to-peripheral gradient in ganglion cell density is normal in mutants. The size of the optic nerves, density of axons, and total number of axons do not differ between mutant and normaldogs. One of three mutant dogs had a small abnormal optic chiasm. Retrograde labeling of ganglion cells demonstrated that the residual crossed projection originated from cells in a widespread region in nasal retina and not solely from the peripheral nasal region, as might be expected of an anti-albino. Although our analysis does not rule out the retina as a site of mutant gene action, the modest differences between mutant and normal retinas suggest that the mutation either acts outside the retina or exerts a highly specific effect on ganglion cell trajectories alone. (C) 1995 Wiley-Liss, Inc.

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Documento generato il 24/09/20 alle ore 04:21:44