Cross-Fostering Study
Objective: To assess whether transgenerational behavioral and neuroanatomical effects are inherited via parental gametes rather than through parental care using cross-fostering methodology
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Protocol Steps
F0 Generation Odor Fear Conditioning
Subject F0 mice to odor fear conditioning before conception using acetophenone as the conditioned odor stimulus
Note: Acetophenone activates the Olfr151 odorant receptor
View evidence from paper
“We subjected F0 mice to odor fear conditioning before conception and found that subsequently conceived F1 and F2 generations had an increased behavioral sensitivity to the F0-conditioned odor”
F1 Generation Behavioral Testing
Test F1 generation offspring for behavioral sensitivity to the F0-conditioned odor (acetophenone) and other odors
Note: F1 generation was subsequently conceived after F0 conditioning
View evidence from paper
“subsequently conceived F1 and F2 generations had an increased behavioral sensitivity to the F0-conditioned odor, but not to other odors”
F2 Generation Behavioral Testing
Test F2 generation offspring for behavioral sensitivity to the F0-conditioned odor (acetophenone) and other odors
Note: F2 generation demonstrates transgenerational inheritance of behavioral sensitivity
View evidence from paper
“subsequently conceived F1 and F2 generations had an increased behavioral sensitivity to the F0-conditioned odor, but not to other odors”
Neuroanatomical Analysis
Examine neuroanatomical representation of the Olfr151 pathway in F1 and F2 generations
Note: Enhanced neuroanatomical representation complements behavioral sensitivity
View evidence from paper
“the behavioral sensitivity of the F1 and F2 generations to acetophenone was complemented by an enhanced neuroanatomical representation of the Olfr151 pathway”
Sperm DNA Bisulfite Sequencing
Perform bisulfite sequencing of sperm DNA from conditioned F0 males and F1 naive offspring to assess methylation patterns
Note: Analysis reveals CpG hypomethylation in the Olfr151 gene
View evidence from paper
“Bisulfite sequencing of sperm DNA from conditioned F0 males and F1 naive offspring revealed CpG hypomethylation in the Olfr151 gene”
In Vitro Fertilization
Perform in vitro fertilization to test whether transgenerational effects are inherited via parental gametes
Note: Used to distinguish gametic inheritance from parental care effects
View evidence from paper
“In vitro fertilization, F2 inheritance and cross-fostering revealed that these transgenerational effects are inherited via parental gametes”
Cross-Fostering
Conduct cross-fostering experiments to assess whether transgenerational behavioral and neuroanatomical effects are inherited via parental gametes rather than through parental care
Note: Cross-fostering distinguishes genetic/epigenetic inheritance from environmental parental effects
View evidence from paper
“In vitro fertilization, F2 inheritance and cross-fostering revealed that these transgenerational effects are inherited via parental gametes”