Publications by authors named "Weed N"

-acting regulatory enhancer elements are valuable tools for gaining cell type-specific genetic access. Leveraging large chromatin accessibility atlases, putative enhancer sequences can be identified and deployed in adeno-associated virus (AAV) delivery platforms. However, a significant bottleneck in enhancer AAV discovery is charting their detailed expression patterns , a process that currently requires gold-standard one-by-one testing.

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Objective: To investigate COVID-19 disparities between Hispanic/Latino persons (H/L) and non-H/L persons in an agricultural community by examining behavioral and demographic differences.

Methods: In September 2020, we conducted Community Assessments for Public Health Emergency Response in Wenatchee and East Wenatchee, Washington, to evaluate differences between H/L and non-H/L populations in COVID-19 risk beliefs, prevention practices, household needs, and vaccine acceptability. We produced weighted sample frequencies.

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The distinctive physiology of striatal medium spiny neurons (MSNs) underlies their ability to integrate sensory and motor input. In rodents, MSNs have a hyperpolarized resting potential and low input resistance. When activated, they have a delayed onset of spiking and regular spike rate.

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We present an enhancer AAV toolbox for accessing and perturbing striatal cell types and circuits. Best-in-class vectors were curated for accessing major striatal neuron populations including medium spiny neurons (MSNs), direct and indirect pathway MSNs, as well as Sst-Chodl, Pvalb-Pthlh, and cholinergic interneurons. Specificity was evaluated by multiple modes of molecular validation, three different routes of virus delivery, and with diverse transgene cargos.

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Large-scale analysis of single-cell gene expression has revealed transcriptomically defined cell subclasses present throughout the primate neocortex with gene expression profiles that differ depending upon neocortical region. Here, we test whether the interareal differences in gene expression translate to regional specializations in the physiology and morphology of infragranular glutamatergic neurons by performing Patch-seq experiments in brain slices from the temporal cortex (TCx) and motor cortex (MCx) of the macaque. We confirm that transcriptomically defined extratelencephalically projecting neurons of layer 5 (L5 ET neurons) include retrogradely labeled corticospinal neurons in the MCx and find multiple physiological properties and ion channel genes that distinguish L5 ET from non-ET neurons in both areas.

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Article Synopsis
  • The mammalian cortex consists of different cell types that have specific properties, which are important for understanding how the cortex functions in both health and disease.
  • Researchers utilized data from mouse and human studies to identify marker genes and enhancers for various cortical cell types, creating a comprehensive set of tools for targeting these cells specifically.
  • They introduced fifteen new transgenic driver lines, two new reporter lines, and over 800 enhancer AAVs, facilitating a wide range of experimental approaches to study the mammalian cortex and its functions.
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Article Synopsis
  • Recent studies on human cortex have shown that GABAergic neurons have a complex hierarchical organization with various subclasses and specific types.
  • Researchers used advanced techniques to study these neurons in human brain slices, combining viral labeling and single-cell RNA sequencing.
  • The findings revealed detailed differences within GABAergic neuron types, including variations between human and mouse neurons and highlighted the need for comprehensive analysis to better understand brain cell properties.
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Proper brain function requires the assembly and function of diverse populations of neurons and glia. Single cell gene expression studies have mostly focused on characterization of neuronal cell diversity; however, recent studies have revealed substantial diversity of glial cells, particularly astrocytes. To better understand glial cell types and their roles in neurobiology, we built a new suite of adeno-associated viral (AAV)-based genetic tools to enable genetic access to astrocytes and oligodendrocytes.

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Crossing the blood-brain barrier in primates is a major obstacle for gene delivery to the brain. Adeno-associated viruses (AAVs) promise robust, non-invasive gene delivery from the bloodstream to the brain. However, unlike in rodents, few neurotropic AAVs efficiently cross the blood-brain barrier in non-human primates.

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Delivering genes to and across the brain vasculature efficiently and specifically across species remains a critical challenge for addressing neurological diseases. We have evolved adeno-associated virus (AAV9) capsids into vectors that transduce brain endothelial cells specifically and efficiently following systemic administration in wild-type mice with diverse genetic backgrounds, and in rats. These AAVs also exhibit superior transduction of the CNS across non-human primates (marmosets and rhesus macaques), and in ex vivo human brain slices, although the endothelial tropism is not conserved across species.

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Adeno-associated viruses (AAVs) promise robust gene delivery to the brain through non-invasive, intravenous delivery. However, unlike in rodents, few neurotropic AAVs efficiently cross the blood-brain barrier in non-human primates (NHPs). Here we describe AAV.

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Article Synopsis
  • Efficient delivery of genes across the brain's blood vessels is crucial for treating neurological diseases, and modified adeno-associated viruses (AAV9) have been developed to target brain endothelial cells effectively in various animal models.
  • These modified AAVs show enhanced ability to transduce cells in non-human primates and human brain tissue, although their targeting efficiency varies across species.
  • The research indicates that these mouse-specific capsids can be utilized to alter the blood-brain barrier, turning it into a functional biofactory that produces beneficial proteins, like Hevin, to improve synaptic function in mice with synaptic deficits.
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Global rates of attention-deficit/hyperactivity disorder (ADHD) have risen. In Korea, ADHD is associated with functional impairments and comorbidity with other psychological disorders. This study examined the correlates of ADHD in a psychiatric sample of Korean adolescents on the Minnesota Multiphasic Personality Inventory-Adolescent-Restructured Form (MMPI-A-RF).

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Viral genetic tools that target specific brain cell types could transform basic neuroscience and targeted gene therapy. Here, we use comparative open chromatin analysis to identify thousands of human-neocortical-subclass-specific putative enhancers from across the genome to control gene expression in adeno-associated virus (AAV) vectors. The cellular specificity of reporter expression from enhancer-AAVs is established by molecular profiling after systemic AAV delivery in mouse.

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Prescription stimulant misuse (PSM) is a growing concern on college campuses and more research is needed to validate clinical measures commonly used for the assessment of risk for PSM among college students. The present study examined correlations between scores on the Minnesota Multiphasic Personality Inventory-Second Edition-Restructured Form (MMPI-2-RF) and self- and peer-reported misuse of prescription stimulants and other drugs in a sample of 96 pairs (included within a total N = 212) of undergraduate students. Nearly half of the participants (48%) reported that they had been offered prescription stimulants and one quarter (26%) reported trying someone else's prescription stimulant medications, often to perform better academically.

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Establishing the cross-cultural measurement invariance of psychometric scales is considered an essential step before scale means are compared across cultures. Although the MMPI instruments have been extensively researched, few studies have examined the measurement equivalence of MMPI scales in cross-cultural research. This study examined the measurement invariance of MMPI-2-RF Restructured Clinical Scale 4 (RC4; Antisocial Behavior) using multi-group confirmatory factor analysis with American and Korean clinical samples by (a) comparing a rationally-derived four-factor model (School Problems, Substance Abuse, Family Problems, and Violation of Social Norms) with a one-factor model, and (b) examining the measurement invariance of the RC4 four-factor model.

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Nucleoporins (NUPs) are an essential component of the nuclear-pore complex, which regulates nucleocytoplasmic transport of macromolecules. Pathogenic variants in NUP genes have been linked to several inherited human diseases, including a number with progressive neurological degeneration. We present six affected individuals with bi-allelic truncating variants in NUP188 and strikingly similar phenotypes and clinical courses, representing a recognizable genetic syndrome; the individuals are from four unrelated families.

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One of the most important considerations in psychological and educational assessment is the extent to which a test is free of bias and fair for groups with diverse backgrounds. Establishing measurement invariance (MI) of a test or items is a prerequisite for meaningful comparisons across groups as it ensures that test items do not function differently across groups. Demonstration of MI is particularly important in assessment settings where test scores are used in decision making.

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The mammalian neocortex is subdivided into a series of cortical areas that are functionally and anatomically distinct and are often distinguished in brain sections using histochemical stains and other markers of protein expression. We searched the Allen Mouse Brain Atlas, a database of gene expression, for novel markers of cortical areas. To screen for genes that change expression at area borders, we employed a random forest algorithm and binary region classification.

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Objective: The purpose of the present study was to compare psychometric properties of the Substance Abuse (SUB) Scale on the Korean Minnesota Multiphasic Personality Inventory-Adolescent-Restructured Form (MMPI-A-RF) with those on the Korean MMPI-A (the Alcohol/Drug Problem Acknowledgment Scale [ACK]), the Alcohol/Drug Problem Proneness Scale [PRO], and the MacAndrew Alcoholism Scale-Revised Scale [MAC-R]).

Method: Participants consisted of 237 Korean adolescent psychiatric patients whose scores on these measures were compared in terms of internal consistency and predictive validity.

Results: Scores on SUB exhibited superior internal consistency to that of the MMPI-A substance abuse scales.

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Several studies have shown that response option augmentation (ROA), or increasing the number of response options of the Minnesota Multiphasic Personality Inventory (MMPI)-2-RF, improves the reliability of scale scores but does not improve convergent validity. However, these studies have not taken into account the response format of criterion measures, which may represent a form of common method variance (CMV). This study examined ROA with the MMPI-2-RF to determine whether number of response options is a source of CMV that may have affected previous estimates of convergent validity.

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Do MMPI-2 or MMPI-2-RF profiles differ in how accurately they depict examinees? To explore this question, we examined differences in clinical descriptions of equivalent profiles from the two instruments. Fourteen valid MMPI-2 protocols from an archival private practice sample were scored as both the MMPI-2 and the MMPI-2-RF. The resulting 28 profiles were coded separately by four raters using the Midwestern Q-Sort.

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The reliability of six Minnesota Multiphasic Personality Inventory-Second edition (MMPI-2) computer-based test interpretation (CBTI) programs was evaluated across a set of 20 commonly appearing MMPI-2 profile codetypes in clinical settings. Evaluation of CBTI reliability comprised examination of (a) interrater reliability, the degree to which raters arrive at similar inferences based on the same CBTI profile and (b) interprogram reliability, the level of agreement across different CBTI systems. Profile inferences drawn by four raters were operationalized using q-sort methodology.

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Reflecting the common use of the MMPI-2 to provide diagnostic considerations, computer-based test interpretations (CBTIs) also typically offer diagnostic suggestions. However, these diagnostic suggestions can sometimes be shown to vary widely across different CBTI programs even for identical MMPI-2 profiles. The present study evaluated the diagnostic reliability of 6 commercially available CBTIs using a 20-item Q-sort task developed for this study.

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The purpose of this study was to examine whether gender differences on the Minnesota Multiphasic Personality Inventory-2 (MMPI-2; Butcher, Dahlstrom, Graham, Tellegen, & Kaemmer, 1989) and Minnesota Multiphasic Personality Inventory-Adolescent (MMPI-A; Butcher et al., 1992) items are comparable across 2 distinctive cultural samples: Americans and Koreans. Using large, representative adult and adolescent samples from both cultures, we found that the American samples were associated with a higher proportion of items with gender differences than the Korean samples.

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