Role of miRNA-9 in Brain Development

MicroRNAs (miRNAs) are a class of small regulatory RNAs involved in gene regulation. The regulation is effected by either translational inhibition or transcriptional silencing. In vertebrates, the importance of miRNA in development was discovered from mice and zebrafish dicer knockouts. The miRNA-9 (miR-9) is one of the most highly expressed miRNAs in the early and adult vertebrate brain. It has diverse functions within the developing vertebrate brain. In this article, the role of miR-9 in the developing forebrain (telencephalon and diencephalon), midbrain, hindbrain, and spinal cord of vertebrate species is highlighted. In the forebrain, miR-9 is necessary for the proper development of dorsoventral telencephalon by targeting marker genes expressed in the telencephalon. It regulates proliferation in telencephalon by regulating Foxg1, Pax6, Gsh2, and Meis2 genes. The feedback loop regulation between miR-9 and Nr2e1/Tlx helps in neuronal migration and differentiation. Targeting Foxp1 and Foxp2, and Map1b by miR-9 regulates the radial migration of neurons and axonal development. In the organizers, miR-9 is inversely regulated by hairy1 and Fgf8 to maintain zona limitans interthalamica and midbrain-hindbrain boundary (MHB). It maintains the MHB by inhibiting Fgf signaling genes and is involved in the neurogenesis of the midbrain-hindbrain by regulating Her genes. In the hindbrain, miR-9 modulates progenitor proliferation and differentiation by regulating Her genes and Elav3. In the spinal cord, miR-9 modulates the regulation of Foxp1 and Onecut1 for motor neuron development. In the forebrain, midbrain, and hindbrain, miR-9 is necessary for proper neuronal progenitor maintenance, neurogenesis, and differentiation. In vertebrate brain development, miR-9 is involved in regulating several region-specific genes in a spatiotemporal pattern.

Implementing the use of a biobank in the endangered black-footed ferret (Mustela nigripes)

In the current global health climate, many conservation biologists are managing crisis situations, including increased species extinction rates. One strategy for securing wildlife populations into the future is to preserve biomaterials in genome resource banks (GRB; or ‘biobanks’). However, for GRBs to be successful we must understand the fundamental reproductive biology of species, along with developing assisted reproductive techniques (ARTs), including AI and semen cryopreservation. ART has been successfully used for several taxa, from amphibians to mammals, including ungulates, carnivores and primates. Not all these success stories implemented the use of a biobank, but one example that discussed herein is the black-footed ferret (Mustela nigripes) GRB. From a founder population of seven individuals, this species has been breeding in a managed setting for nearly 30 years. The goal of the breeding program is to maintain genetic integrity by ensuring each individual has the opportunity to pass his/her genes onto the next generation, while simultaneously providing animals for release into the wild. Scientists have used ART (e.g. AI) in the recovery program. Recently, semen from an individual of the founder population that was cryopreserved for up to 20 years was used successfully for AI, which improved the genetic diversity of the population. The black-footed ferret recovery program can serve as a model for other endangered species and demonstrates the usefulness of ART and GRBs to maintain highly endangered species into the future.

REVIEW: Insider's view of nuclear-free NZ's 'people power'

Book review of: Peace, Power & Politics: How New Zealand Became Nuclear Free, by Maire Leadbeater. Dunedin: Otago University Press, 2013, 344pp. , ISBN 9781877578588Journalism's focus on major political figures and high level negotiations leaves the more diffuse activities of grassroots politics in the shadows. So it is refreshing to see a well-researched book unapologetically placing civic groups at centre-stage. Marie Leadbeater’s thorough chronology of the last 40 years of New Zealand’s peace movement and the fight for a nuclear-free country fills some gaps in our knowledge about the mechanics of ‘people power’. It’s an insider’s view. Leadbeater, daughter of feminist and peace campaigner Elsie Locke, says activism is in her genes. She was secretary and then spokeperson for Auckland’s Campaign for Nuclear Disarmament, closely involved with the nuclear free protests of the 1970s and 1980s and still demonstrating at Waihopai’s satellite communication monitoring station in 2013.

Ethical Dimensions of Disparities in Depression Research and Treatment in the Pharmacogenomic Era

Personalized medicine with its promise of developing interventions tailored to an individual's health need and genetically related response to treatment might seem a promising antidote to the documented underutilization of standard depression treatments by African Americans. In addition, understanding depression not merely in biochemical terms but also in genetic terms might seem to counter cultural beliefs and stigma that attach to depression when conceived as a mood or behavioral problem under an individual's control. After all, if there is one thing for which a person is not responsible and cannot be blamed, it is her genes. Nevertheless, for multiple reasons, a personalized medical approach to depression treatment, and its attendant conceptualization of depression and treatment response as genetically influenced, present the risk of exacerbating well-documented disparities in access to, and utilization of, treatment for depression among African-American and Caucasian elderly adults.

When reasoning is persuasive but wrong

Mercier and Sperber (M&S) are correct that reasoning and argumentation are closely related. But they are wrong in arguing that this relationship is one of evolutionary adaptation. In fact, persuasive reasoning that is not veridical can be fatal to the individual and to the propagation of his or her genes, as well as to the human species as a whole.

The profile of ErbB/Her family genes copy number assessed by real-time PCR in parathyroid adenoma and hyperplasia associated with sporadic primary hyperparathyroidism.

Hyperparathyroidism (pHPT) is a relatively frequent endocrinopathy, however, the molecular mechanisms of its etiology remain poorly understood. This disorder is mainly associated with benign tumours (adenoma) and hyperplasia of the parathyroid, hence, the focus is directed also to genes that are likely to be involved in carcinogenesis. Among such genes are ErbB/Her family genes already used in diagnosis of other tumours (e.g., breast carcinoma) and reported also to play a role in development of endocrine lesions. So far, ErbB-1/Her-1/EGFR expression has been detected in pHPT-associated adenomas and hyperplasia as opposed to no expression in normal parathyroid tissue. Moreover, losses or gains of the fragments of chromosomes where ErbB/Her genes are located have been reported. In this study, the gene dosage of ErbB/Her family genes were determined for the first time in parathyroid adenomas, hyperplasia and morphologically unchanged tissue in order to establish their putative role in the development of the disease. Genomic DNA was isolated from 33 patients with sporadic hyperparathyroidism and the gene copy numbers were assessed using real-time PCR. The ErbB/Her genes' profile was unaltered in most of the examined samples. Two low-level amplifications of ErbB-1/Her-1/EGFR gene, two deletions of ErbB-2/Her-2, and six deletions of ErbB-4/Her-4 were found. The ErbB-3/Her-3 gene remained unaffected. No correlation with clinical parameters was found for any gene. Both the low number of alterations and a lack of their associations with clinical parameters exclude the prognostic value of the ErbB/Her genes family in parathyroid tumourigenesis. Nevertheless, the ErbB-4/Her-4 deletions seem to be interesting for further investigations, especially in the context of PTH secretion.