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Study Of Developmental Inhibition Of Drosophila Melanogaster Induced By Mercuric Chloride And Associated Larval Chromosomal Rearrangements

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Author: 
Ashim Kumar Basak, Tridip Chatterjee, Sumangal Nandy
Abstract: 

Mercury is a hazardous element that occurs naturally and considered by World Health Organization as one of the top ten chemicals of major public health concern. Exposure of mercury to human may occur through occupational activities, diet, medical uses and can cause serious health hazards. Although developmental toxicity of mercury is known, reports involving dose dependent effect of any of its compound on the development of human or in animal is not enough. Using Drosophila melanogaster, a model organism we have shown that, a mercury salt i.e. mercuric chloride dose dependently inhibited the development of this fly both by prolonging the time of metamorphosis and reducing the progeny number. Furthermore dose dependent developmental inhibition was found to be associated with simultaneous strucutral abnormalities in the third instar larval polytene chromosome of the flies indicating chromosomal defects could negatively affect the expression of genes needed for its normal development. Owing to substantial genetic homology between Drosophila and human, results of our study may indicate the possibility of occurence of analogous situations in human development due to maternal exposure of mercury compounds.

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