Lens regeneration in amphibians, Biology

Lens Regeneration in Amphibians

It is an amazing fact that between all vertebrates only certain amphibians have the unique ability to regenerate lens, iris and retina in adult lire. The amphibians also change in their capability to regenerate a lens and in the source of cells from which a new lens is formed. Members of sub-order salamandridae (salamander, Triturus) have the significant ability of growing a new lens from the dorsal iris epithelium (neural ectoderm).

This is a unique instance of metaplasia, as the regenerating iris is derived from neural ectoderm and may be regarded as an extension of the brain whereas the original lens is derived from the epidermal ectoderm. This kind of regeneration has demonstrated that even adult differentiated cells can keep their potential to produce other cell types. In the larvae of the South African frog. Xenopus laevis an invagination of corneal epithelium gives increment to a ball of cells which transforms into the new lens. The procedure of the new lens regeneration in X. laevis more closely duplicates the embryonic process, like both the first lens and the regenerate lens develop from cells of epidermal ectodermal origin, though, even so it is a case of metaplasia, since differentiated cells of corneal epithelium give rise to lens cells that are morphologically and biochemically very different from those of the corneal epithelium. The regenerating capability in this anuran however species disappears at metamorphosis.

Posted Date: 1/31/2013 4:53:52 AM | Location : United States

Related Discussions:- Lens regeneration in amphibians, Assignment Help, Ask Question on Lens regeneration in amphibians, Get Answer, Expert's Help, Lens regeneration in amphibians Discussions

Write discussion on Lens regeneration in amphibians
Your posts are moderated
Related Questions
Q. What is cerumen? Cerumen is a fatty, oily substance produced by theceruminous glands in outer part of ear canal. This compound is generally referred to as ear wax and, toget

Q. What is the mechanism by which the neural impulse is transmitted along the axon? The neural impulse is transmitted along the neuronal membrane through depolarization of cons

Transplantation - It is implanting of a living or preserved tissue or organ from one site to another side in the same individual or from one individual called donor to recip

what are the general characteristicss of porifera

Explain the Executive Functions - Psychological tests Executive functions are those involved in the planning, organisation, regulation and monitoring of goal directed behaviour

Coelom - Metazoa True coelom is a body cavity which arises within the embryonic mesoderm so that the cavity lies between the body wall (integument; ectoderm) and guts (endoder

Who created the two-part naming system used in biology? The scientific naming system that is used worldwide today was primary devised by Swedish naturalist Carl Linnaeus in 173

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Q. Illustrate Hypertrophic cardiomyopathy? It is a genetic disorder due to mutations in the gene that encodes for β-Cardiac myosin heavy chain (Localised to chromosome 14). It