Source Paper
Tie-Yuan Zhang, Ian C. Hellstrom, Rosemary C. Bagot, Xianglan Wen, Josie Diorio et al.
Journal of Neuroscience • 2010
Parenting and the early environment influence the risk for various psychopathologies. Studies in the rat suggest that variations in maternal care stably influence DNA methylation, gene expression, and neural function in the offspring. Maternal care affects neural development, including the GABAergic system, the function of which is linked to the pathophysiology of diseases including schizophrenia and depression. Postmortem studies of human schizophrenic brains have revealed decreased forebrain expression of glutamic acid decarboxylase 1 ( GAD1 ) accompanied by increased methylation of a GAD1 promoter. We examined whether maternal care affects GAD1 promoter methylation in the hippocampus of adult male offspring of high and low pup licking/grooming (high-LG and low-LG) mothers. Compared with the offspring of low-LG mothers, those reared by high-LG dams showed enhanced hippocampal GAD1 mRNA expression, decreased cytosine methylation, and increased histone 3–lysine 9 acetylation (H3K9ac) of the GAD1 promoter. DNA methyltransferase 1 expression was significantly higher in the offspring of low- compared with high-LG mothers. Pup LG increases hippocampal serotonin (5-HT) and nerve growth factor-inducible factor A (NGFI-A) expression. Chromatin immunoprecipitation assays revealed enhanced NGFI-A association with and H3K9ac of the GAD1 promoter in the hippocampus of high-LG pups after a nursing bout. Treatment of hippocampal neuronal cultures with either 5-HT or an NGFI-A expression plasmid significantly increased GAD1 mRNA levels. The effect of 5-HT was blocked by a short interfering RNA targeting NGFI-A. These results suggest that maternal care influences the development of the GABA system by altering GAD1 promoter methylation levels through the maternally induced activation of NGFI-A and its association with the GAD1 promoter.
Objective: Assess maternal licking/grooming (LG) behavior to classify mothers as high-LG or low-LG and examine effects on offspring GAD1 promoter methylation and hippocampal gene expression
This is a Maternal Care Assessment - Pup Licking/Grooming protocol using rat as the model organism. The procedure involves 12 procedural steps. Extracted from a 2010 paper published in Journal of Neuroscience.
Model and subjects
rat • Not specified in provided text • male • Adult male offspring • Not specified in provided text
Study window
Estimated timing pending
Core workflow
Maternal Behavior Classification • Offspring Rearing • Hippocampal Tissue Collection
Primary readouts
Key equipment and reagents
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Observe and classify mothers based on pup licking/grooming behavior into high-LG (high pup licking/grooming) or low-LG (low pup licking/grooming) categories
Note: Classification determines maternal care phenotype for subsequent offspring analysis
“variations in maternal care stably influence DNA methylation, gene expression, and neural function in the offspring”
Rear offspring with either high-LG or low-LG dams to adulthood
Note: Offspring are exposed to different levels of maternal licking/grooming during development
“Compared with the offspring of low-LG mothers, those reared by high-LG dams showed enhanced hippocampal GAD1 mRNA expression”
Collect hippocampal tissue from adult male offspring for molecular analysis
Note: Tissue used for GAD1 mRNA expression, DNA methylation, and histone acetylation analysis
“examined whether maternal care affects GAD1 promoter methylation in the hippocampus of adult male offspring”
Measure hippocampal GAD1 mRNA expression levels in offspring from high-LG versus low-LG mothers
Note: High-LG offspring show enhanced expression compared to low-LG offspring
“those reared by high-LG dams showed enhanced hippocampal GAD1 mRNA expression”
Assess cytosine methylation levels of the GAD1 promoter in hippocampal tissue
Note: High-LG offspring show decreased cytosine methylation compared to low-LG offspring
“decreased cytosine methylation, and increased histone 3–lysine 9 acetylation (H3K9ac) of the GAD1 promoter”
Measure histone 3–lysine 9 acetylation (H3K9ac) at the GAD1 promoter
Note: High-LG offspring show increased H3K9ac compared to low-LG offspring
“increased histone 3–lysine 9 acetylation (H3K9ac) of the GAD1 promoter”
Quantify DNA methyltransferase 1 (DNMT1) expression in offspring hippocampus
Note: Expression is significantly higher in low-LG offspring compared to high-LG offspring
“DNA methyltransferase 1 expression was significantly higher in the offspring of low- compared with high-LG mothers”
Measure hippocampal serotonin (5-HT) and nerve growth factor-inducible factor A (NGFI-A) expression in pups
Note: Pup LG increases both 5-HT and NGFI-A expression
“Pup LG increases hippocampal serotonin (5-HT) and nerve growth factor-inducible factor A (NGFI-A) expression”
Perform chromatin immunoprecipitation (ChIP) assays to assess NGFI-A association with GAD1 promoter and H3K9ac levels
Note: Conducted on hippocampal tissue from high-LG pups after a nursing bout
“Chromatin immunoprecipitation assays revealed enhanced NGFI-A association with and H3K9ac of the GAD1 promoter in the hippocampus of high-LG pups after a nursing bout”
Treat hippocampal neuronal cultures with serotonin (5-HT) and measure GAD1 mRNA levels
Note: 5-HT treatment significantly increases GAD1 mRNA levels
“Treatment of hippocampal neuronal cultures with either 5-HT or an NGFI-A expression plasmid significantly increased GAD1 mRNA levels”
Treat hippocampal neuronal cultures with NGFI-A expression plasmid and measure GAD1 mRNA levels
Note: NGFI-A expression plasmid treatment significantly increases GAD1 mRNA levels
“Treatment of hippocampal neuronal cultures with either 5-HT or an NGFI-A expression plasmid significantly increased GAD1 mRNA levels”
Apply short interfering RNA (siRNA) targeting NGFI-A to block the effect of 5-HT on GAD1 mRNA levels in neuronal cultures
Note: NGFI-A siRNA blocks the 5-HT-induced increase in GAD1 mRNA, indicating NGFI-A is required for 5-HT effects
“The effect of 5-HT was blocked by a short interfering RNA targeting NGFI-A”
This section explains what the experiment is doing, which readouts matter, what the data artifacts usually look like, and how the analysis should flow from raw capture to reported result.
Assess maternal licking/grooming (LG) behavior to classify mothers as high-LG or low-LG and examine effects on offspring GAD1 promoter methylation and hippocampal gene expression
Objective
Assess maternal licking/grooming (LG) behavior to classify mothers as high-LG or low-LG and examine effects on offspring GAD1 promoter methylation and hippocampal gene expression
Subjects
From paperrat • Not specified in provided text • male • Adult male offspring • Not specified in provided text
Cohort notes
From paperOffspring of high-LG and low-LG mothers
Maternal Behavior Classification (Not specified in provided text)
Offspring Rearing (Until adult stage)
Hippocampal Tissue Collection (Not specified)
GAD1 mRNA Expression Analysis (Not specified)
Maternal licking/grooming behavior classification (high-LG vs low-LG)
From paperNot specified in provided text
Artifact type
Endpoint measurements summarized by group or timepoint
Comparison focus
Compare endpoint magnitude between groups, timepoints, or both
Hippocampal GAD1 mRNA expression levels
From paperNot specified in provided text
Artifact type
Endpoint measurements summarized by group or timepoint
Comparison focus
Compare endpoint magnitude between groups, timepoints, or both
GAD1 promoter cytosine methylation levels
From paperNot specified in provided text
Artifact type
Endpoint measurements summarized by group or timepoint
Comparison focus
Compare endpoint magnitude between groups, timepoints, or both
Histone 3–lysine 9 acetylation (H3K9ac) at GAD1 promoter
From paperNot specified in provided text
Artifact type
Endpoint measurements summarized by group or timepoint
Comparison focus
Compare endpoint magnitude between groups, timepoints, or both
Maternal licking/grooming behavior classification (high-LG vs low-LG)
From paperRaw artifact
Per-sample or per-animal endpoint measurements collected during the experiment
Processed artifact
Structured table with cleaned measurements ready for comparison
Final reported form
Summary statistics and between-group or across-timepoint comparisons
Hippocampal GAD1 mRNA expression levels
From paperRaw artifact
Per-sample or per-animal endpoint measurements collected during the experiment
Processed artifact
Structured table with cleaned measurements ready for comparison
Final reported form
Summary statistics and between-group or across-timepoint comparisons
GAD1 promoter cytosine methylation levels
From paperRaw artifact
Per-sample or per-animal endpoint measurements collected during the experiment
Processed artifact
Structured table with cleaned measurements ready for comparison
Final reported form
Summary statistics and between-group or across-timepoint comparisons
Histone 3–lysine 9 acetylation (H3K9ac) at GAD1 promoter
From paperRaw artifact
Per-sample or per-animal endpoint measurements collected during the experiment
Processed artifact
Structured table with cleaned measurements ready for comparison
Final reported form
Summary statistics and between-group or across-timepoint comparisons
Acquisition
Collect raw experimental outputs with enough metadata to preserve sample identity, condition, and timing.
Preprocessing / cleaning
Not specified in provided text
Scoring or quantification
Quantify the primary readouts for this experiment: Maternal licking/grooming behavior classification (high-LG vs low-LG); Hippocampal GAD1 mRNA expression levels; GAD1 promoter cytosine methylation levels; Histone 3–lysine 9 acetylation (H3K9ac) at GAD1 promoter.
Statistical comparison
Statistical method not yet structured for this page.
Reporting output
Report representative outputs alongside summary comparisons for Maternal licking/grooming behavior classification (high-LG vs low-LG), Hippocampal GAD1 mRNA expression levels, GAD1 promoter cytosine methylation levels, Histone 3–lysine 9 acetylation (H3K9ac) at GAD1 promoter.
Source links and direct wording from the methods section for validation and deeper review.
Citation
Tie-Yuan Zhang et al. (2010). Maternal Care and DNA Methylation of a Glutamic Acid Decarboxylase 1 Promoter in Rat Hippocampus. Journal of Neuroscience
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