Intergenerational Patterns of DNA Methylation in Procambarus clarkii Following Exposure to Genotoxicants: A Conjugation in Past Simple or Past Continuous?

Toxics

Lola Llorente¹  Oscar Herrero¹  Rosario Planelló¹  Sofia Guilherme²  Raquel Marçal²  Mário Pacheco² 

[1] Biology and Environmental Toxicology Group, Faculty of Sciences, Universidad Nacional de Educación a Distancia (UNED), Paseo de la Senda del Rey 9, 28040 Madrid, Spain;Centre for Environmental and Marine Studies (CESAM), Department of Biology, Santiago University Campus, University of Aveiro, 3810-193 Aveiro, Portugal;

关键词: crustacean;    epigenetics;    methylome;    intergenerational;    genotoxic;    pesticides;   

DOI  :  10.3390/toxics9110271

来源: DOAJ

【 摘 要 】

Epigenome is susceptible to modulation by environmental pressures—namely, through alterations in global DNA methylation, impacting the organism condition and, ultimately, reverberating on the phenotype of the subsequent generations. Hence, an intergenerational study was conducted, aiming to clarify the influence of genotoxicants on global DNA methylation of the crayfish Procambarus clarkii. Two subsequent generations were exposed to the herbicide penoxsulam (Px; 23 µg·L⁻¹) and to the genotoxicant model ethyl methanesulfonate (EMS; 5 mg·L⁻¹). Px did not induce changes in DNA methylation of adult crayfish (F₀). However, the hypomethylation occurring in unexposed F₁ juveniles demonstrated that the history of exposure per se can modulate epigenome. In F₁ descendants of the Px-exposed group, methylome (hypermethylated) was more affected in males than in females. EMS-induced hypomethylation in adult females (F₀), also showed gender specificity. In addition, hypomethylation was also observed in the unexposed F₁ crayfish, indicating an intergenerational epigenetic effect. The modulatory role of past exposure to penoxsulam or to EMS also showed a dependency on the crayfish developmental stage. Overall, this research revealed that indirect experiences (events occurring in a predecessor generation) can have an impact even greater than direct experiences (present events) on the epigenetic dynamics.

【 授权许可】

Unknown