Contrary to the conventional wisdom that the majority of healthy cells in an individual have identical genomes, endogenous L1 retrotransposons are now known to 'jump'during neurogenesis and change neuronal genomes. The diversity and prevalence of unique genomes is unknown, but these are essential data for understanding how mobile element-mediated genetic diversity affects neural circuits. Genetic diversity in a population cannot be measured using typical bulk analysis of a million or so cells;therefore, we propose to develop single cell methods to analyze retrotransposition in individual neuronal genomes. To understand how the diversity and prevalence (i.e. the mosaic composition) of de novo mobile element insertions alters neuron function, we propose three experiments. In one experiment, we will examine the mosaic composition of specific neural circuits in behavioral outliers. A second experiment will test the expectation that new mobile element insertions differentially alter the transcriptome of individual neurons. In a third experiment, we will generate mouse lines with little or no retrotransposition to determine if mobile element insertions are both necessary and sufficient for specific aspects of neuron function. Taken together, the application of single cell genomic approaches to understand neuronal diversity promises to challenge basic assumptions about the genetics of behavior and the origin of human neurodevelopmental disorders.
Our overall objective is to develop single-cell approaches to measure mobile element-mediated genetic diversity in neural circuits. These tools promise to reveal new factors that bring about discordant behavioral phenotypes in monozygotic twins and contribute to polygenic neuropsychiatric diseases such as schizophrenia and autism.
|Nuttle, Xander; Giannuzzi, Giuliana; Duyzend, Michael H et al. (2016) Emergence of a Homo sapiens-specific gene family and chromosome 16p11.2 CNV susceptibility. Nature 536:205-9|
|Erwin, Jennifer A; Paquola, ApuÃ£ C M; Singer, Tatjana et al. (2016) L1-associated genomic regions are deleted in somatic cells of the healthy human brain. Nat Neurosci 19:1583-1591|
|Chailangkarn, Thanathom; Trujillo, Cleber A; Freitas, Beatriz C et al. (2016) A human neurodevelopmental model for Williams syndrome. Nature 536:338-43|
|Krishnaswami, Suguna Rani; Grindberg, Rashel V; Novotny, Mark et al. (2016) Using single nuclei for RNA-seq to capture the transcriptome of postmortem neurons. Nat Protoc 11:499-524|
|GonÃ§alves, J Tiago; Bloyd, Cooper W; Shtrahman, Matthew et al. (2016) In vivo imaging of dendritic pruning in dentate granule cells. Nat Neurosci 19:788-91|
|Lacar, Benjamin; Linker, Sara B; Jaeger, Baptiste N et al. (2016) Nuclear RNA-seq of single neurons reveals molecular signatures of activation. Nat Commun 7:11022|
|Johnston, Stephen T; Shtrahman, Matthew; Parylak, Sarah et al. (2016) Paradox of pattern separation and adult neurogenesis: A dual role for new neurons balancing memory resolution and robustness. Neurobiol Learn Mem 129:60-8|
|Bardy, C; van den Hurk, M; Kakaradov, B et al. (2016) Predicting the functional states of human iPSC-derived neurons with single-cell RNA-seq and electrophysiology. Mol Psychiatry 21:1573-1588|
|Bedrosian, Tracy A; Linker, Sara; Gage, Fred H (2016) Environment-driven somatic mosaicism in brain disorders. Genome Med 8:58|
|Bardy, Cedric; van den Hurk, Mark; Eames, Tameji et al. (2015) Neuronal medium that supports basic synaptic functions and activity of human neurons in vitro. Proc Natl Acad Sci U S A 112:E2725-34|
Showing the most recent 10 out of 19 publications