The impact of the insecticide acetamiprid on the embryogenesis of the aquatic model organism Xenopus laevis.

Acetamiprid (ACT) is used extensively in agriculture worldwide, although data on ACT concentrations in natural water bodies and its impact on aquatic organisms are limited. To study whether ACT influences the embryogenesis of the South African clawed frog Xenopus laevis , embryos were incubated in ACT solutions from 0.01 to 100 mg/L. The low concentrations were chosen on the basis of concentrations already found in nature. ACT treatment leads to shorter embryo lengths, intestine malformation and reduced eye areas. It also affects the cranial cartilage and cardiac development as well as the embryo's mobility. The expression of tissue-specific marker genes is affected as well. Thus, our study suggests that pesticides may lead to an increased mortality of non-target organisms and emphasizes the importance of regular testing for ACT concentrations in nature. Our study provides an overview of ACT effects and can therefore be used as a basis for an ACT risk assessment. • ACT leads to morphological defects and impaired organ development. • ACT increases heartrate. • ACT reduces mobility. • ACT impairs the expression of the NCC marker gene egr2 and the heart specific gene mhcα. [ABSTRACT FROM AUTHOR]