In many organisms, the rate of genetic recombination is not uniform along the length of chromosomes or between sexes. To compare the relative recombination rates during meiosis in male and female zebrafish, we constructed a genetic map based on male meiosis. We developed a meiotic mapping panel of 94 androgenetic haploid embryos that were scored for genetic polymorphisms. The resulting male map was compared to female and sex-average maps. We found that the recombination rate in male meiosis is dramatically suppressed relative to that of female meiosis, especially near the centromere. These findings have practical applications for experimental design. The use of exclusively female meiosis in a positional cloning project maximizes the ratio of genetic map distance to physical distance. Alternatively, the use of exclusively male meiosis to localize a mutation initially to a linkage group or to maintain relationships of linked alleles minimizes recombination, thereby facilitating some types of analysis.
Background: Statistics suggest that African Americans have a disproportionately high prevalence of Alzheimer disease (AD), yet are less likely to enroll in AD clinical trials than white individuals. Although research has previously identified various barriers to participation, relatively little is known about how to overcome these barriers and engage African American individuals in AD research. The purpose of this study is to better understand how African Americans conceptualize brain health and their ability to influence healthy brain aging. Methods: Three African American community advocates each facilitated a small group of African American participants over 8 to 10 sessions of a photovoice process involving discussion and sharing of images focused on brain health. Sessions were audiotaped and transcribed verbatim and photographs were uploaded. Findings: Participants recognized a diversity of what brain health can mean and indicated an interconnectedness between brain health and its influences. Key factors that were identified by group members as key to brain health included lifestyle factors, activity, and engagement and nature, resiliency, and positivity. Discussion: These emic insights into perceptions of brain health may represent important foci for targeted messaging strategies to promote brain health and research engagement within the African American population.
Recruitment of African American (AA) participants into clinical research trials in the area of aging and dementia is a major problem facing the field. Although AAs are at a significantly elevated risk of developing Alzheimer’s disease (AD), they are underrepresented in clinical trials and research studies. While previous research has identified a number of barriers to participation, relatively little is known about how to overcome these barriers and engage AA individuals in research. Photovoice may provide a novel approach to advance our understanding of AA perceptions in regards to barriers and strategies to increase AA engagement in brain aging research. The purpose of this project is to add to existing understanding of barriers and facilitators and identify strategies to enhance engagement. Three AA research advocates served as community facilitators to identify and guide groups of AA adults though an 8-10 session photovoice project. Group sessions involved discussions and sharing of images pertaining to various prompts in the area of brain health and research participation. Sessions were audio-taped and transcribed verbatim and photos were uploaded. Participants identified four categories of barriers to AA research participation: Mistrust, the belief that all research involves medication, avoidance and fear of acknowledging problems, and seeing the risks of research but not the need. Participants had various suggestions and approaches for ameliorating each of these barriers. This photovoice community engagement process revealed unique insights into barriers and opportunities for increasing AA engagement in brain aging research.
African Americans (AAs) have an elevated risk of developing dementia, yet are underrepresented in clinical research. This project uses a community-engaged photovoice approach to add to existing understanding of barriers and facilitators to AA participation in Alzheimer’s disease research and identify strategies to enhance engagement. Three AA research advocates served as community facilitators to identify and guide groups of AA adults through an eight to nine session photovoice project. Group sessions involved discussions and sharing of images pertaining to various prompts in the area of brain health and research participation. Sessions were audiotaped and transcribed verbatim. Participants identified three categories of barriers to AA research participation: (a) Mistrust, (b) avoidance and fear of acknowledging problems, and (c) seeing the risks of research but not the need. Participants shared suggestions and approaches for ameliorating each of these barriers. This process revealed unique insights into barriers and opportunities for increasing AA engagement in aging and dementia research.
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