The brains of males and females, men and women, are different, that is a fact. What is debated is how different and how important are those differences. Sex differences in the brain are determined by genetics, hormones, and experience, which in humans includes culture, society, and parental and peer expectations. The importance of nonbiological variables to sex differences in humans is paramount, making it difficult if not impossible to parse out those contributions that are truly biological. The study of animals provides us the opportunity to understand the magnitude and scope of biologically based sex differences in the brain, and understanding the cellular mechanisms provides us insight into novel sources of brain plasticity. Many sex differences are established during a developmental sensitive window by differences in the hormonal milieu of males versus females. The neonatal testis produces large amounts of testosterone which gains access to the brain and is further metabolized into active androgens and estrogens which modify brain development. Major parameters that are influenced by hormones include neurogenesis, cell death, neurochemical phenotype, axonal and dendritic growth, and synaptogenesis. Variance in these parameters results in sex differences in the size of particular brain regions, the projections between brain regions, and the number and type of synapses within particular brain regions. The cellular mechanisms are both region and endpoint specific and invoke many surprising systems such as prostaglandins, endocannabinoids, and cell death proteins. Epigenetic modifications to the genome both establish and maintain sex differences in the brain and behavior. By understanding when, why, and how sex differences in the brain are established, we may also learn the source of strong gender biases in the relative risk and severity of numerous neurological diseases and disorders of mental health. Boys are much more likely to be diagnosed with autism spectrum or attention and hyperactivity disorders, as well as speech and language deficits, compared to girls. By contrast, women are more likely to suffer from affective disorders, such as depression, anxiety, compulsion, and eating disorders and more likely to experience autoimmune and neurodegenerative disorders. Schizophrenia with an early onset is more common in males but a late-onset version is markedly more frequent in females. Male biased disorders have origins in development while female biased disorders are almost exclusively post-puberty. This remarkable shift in disease risk demands our attention. Novel insights into the biological origins of disease are also gained by comparing and contrasting the same processes in different sexes.

When first introduced, antisense oligonucleotides were hailed as the long awaited magic bullet that would provide an unprecedented level of specificity in controlling gene expression. Following this initial enthusiasm, antisense oligonucleotides have been maligned as nonspecific, toxic, and essentially useless. However, application of antisense oligonucleotide technology in the nervous system stands apart from the use of this technique in peripheral systems, largely because of its enormous success. The source of this success remains a matter of some controversy. Modulating Gene Expression by Antisense Oligonucleotides to Understand Neural Functioning addresses the origins of that controversy and determines whether the nervous system is a privileged site for antisense oligonucleotide action and not subject to the same vagaries and pitfalls as non-neuronal systems. Modulating Gene Expression by Antisense Oligonucleotides to Understand Neural Functioning contains chapters by experts in the field that focus on the use of this technique in a variety of behavioral systems, as well as rapid and nonspecific effects and the uptake and metabolism of antisense oligonucleotides by the nervous system. Modulating Gene Expression by Antisense Oligonucleotides to Understand Neural Functioning features: experts in the field reporting on the use of antisense oligonucleotide technology in a variety of behavioral systems, including pain control, circadian rhythms, ingestion and control of water balance, and reproductive behaviors; the novel use of plasmids to express antisense RNA in the nervous system; the biodistribution and metabolism of antisense oligonucleotides in the nervous system; rapid and unusual effects; and non-specific effects.

When first introduced, antisense oligonucleotides were hailed as the long awaited magic bullet that would provide an unprecedented level of specificity in controlling gene expression. Following this initial enthusiasm, antisense oligonucleotides have been maligned as nonspecific, toxic, and essentially useless. However, application of antisense oligonucleotide technology in the nervous system stands apart from the use of this technique in peripheral systems, largely because of its enormous success. The source of this success remains a matter of some controversy. Modulating Gene Expression by Antisense Oligonucleotides to Understand Neural Functioning addresses the origins of that controversy and determines whether the nervous system is a privileged site for antisense oligonucleotide action and not subject to the same vagaries and pitfalls as non-neuronal systems.Modulating Gene Expression by Antisense Oligonucleotides to Understand Neural Functioning contains chapters by experts in the field that focus on the use of this technique in a variety of behavioral systems, as well as rapid and nonspecific effects and the uptake and metabolism of antisense oligonucleotides by the nervous system. Modulating Gene Expression by Antisense Oligonucleotides to Understand Neural Functioning features: * experts in the field reporting on the use of antisense oligonucleotide technology in a variety of behavioral systems, including pain control, circadian rhythms, ingestion and control of water balance, and reproductive behaviors; * the novel use of plasmids to express antisense RNA in the nervous system; * the biodistribution and metabolism of antisense oligonucleotides in the nervous system; * rapid and unusual effects; and * non-specific effects.