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Plaisier, S. B.

Publications and source records attributed to Plaisier, S. B..

2 recordsLinked to original sources

Design and implementation of an asynchronous online course-based undergraduate research experience (CURE) in computational genomics

As genomics and information technologies advance, there is a growing demand for research scientists trained in bioinformatics methods to determine gene expression underlying cell biology in health and disease. One approach to increase the number of scientists proficient in bioinformatics is to expand access through online degree programs and remotely-accessible learning materials. Fully-online learners represent a significant and growing community of historically underrepresented students who are frequently excluded from research opportunities that require in-person attendance during standard operational hours. To address this opportunity gap, we developed an asynchronous course-based undergraduate research experience (CURE) for computational genomics specifically for fully-online biology students. We generated custom learning materials and leveraged remotely-accessible resources on a high performance computing cluster to address a novel research question: the effect of changing quality trimming parameters for RNA sequencing reads on the discovery of sex-based differential gene expression in the human placenta. Here we present the process by which the instructional team devised and distributed analysis to address this question over a 7.5-week CURE and provided students with concurrent training in biology, statistics, computer programming, and professional development integral to the successful execution of the project and future publications. Scores from identical learning assessments administered before and after completion of the CURE showed significant learning gains across biology and coding course objectives. Open-response progress reports were submitted weekly and identified self-reported adaptive coping strategies for challenges encountered throughout the course. The instruction team monitored the progress reports to identify problems that could be resolved through collaboration with instructors and peers via messaging platforms and virtual meetings. Analytics from the course messaging platform demonstrated that high posting engagement was strongly correlated to high normalized learning gains, showing that students can effectively use asynchronous communication platforms to facilitate learning. The online genomics CURE resulted in unanticipated positive outcomes, including students voluntarily extending their participation beyond the course duration, presenting their findings at research symposiums, and applying to graduate school. These outcomes underscore the effectiveness of this genomics CURE for training and recruitment purposes and demonstrate that students can be successful in online STEM-based research experiences if given channels for communication, bespoke and accessible learning materials, and the support of experts in the field. Online CUREs can provide valuable research experience to harness the potential of online STEM students towards a more skilled, diverse, and inclusive workforce for the advancement of biomedical science.

genomics↗

Sex differences in early and term placenta are conserved in adult tissues

BackgroundPregnancy complications vary based on the fetuss genetic sex, which may, in part, be modulated by the placenta. Further, developmental differences early in life can have lifelong health outcomes. Yet, sex differences in gene expression within the placenta at different time points throughout pregnancy and comparisons to adult tissues remains poorly characterized. MethodsHere, we collect and characterize sex differences in gene expression in term placentas ( [≥] 36.6 weeks; 23 male XY and 27 female XX). These are compared with sex differences in previously collected first trimester placenta samples and 42 non-reproductive adult tissues from GTEx. ResultsWe identify 268 and 53 sex differentially expressed genes in the uncomplicated late first trimester and term placentas, respectively. Of the 53 sex differentially expressed genes observed in the term placentas, 31 are also sex differentially expressed genes in the late first trimester placentas. Furthermore, sex differences in gene expression in term placentas are highly correlated with sex differences in the late first trimester placentas. We found that sex differential gene expression in the term placenta is significantly correlated with sex differences in gene expression in 42 non-reproductive adult tissues (correlation coefficient ranged from 0.892 to 0.957), with the highest correlation in brain tissues. Sex differences in gene expression were largely driven by gene expression on the sex chromosomes. We further show that some gametologous genes (genes with functional copies on X and Y) will have different inferred sex differences if the X-linked gene expression in females is compared to the sum of the X-linked and Y-linked gene expression in males. ConclusionsWe find that sex differences in gene expression are conserved in late first trimester and term placentas and that these sex differences are conserved in adult tissues. We demonstrate that there are sex differences associated with innate immune response in late first trimester placentas but there is no significant difference in gene expression of innate immune genes between sexes in healthy full term placentas. Finally, sex differences are predominantly driven by expression from sex-linked genes. HighlightsO_LISex differences in gene expression in late first trimester placentas are positively correlated with sex differences in gene expression in full term placentas; sex differences develop early and are maintained. C_LIO_LISex differences in gene expression on the sex chromosomes in the placenta are correlated to sex differences in adult tissues. C_LIO_LISex-linked gametolog genes require additional methodological approaches for accurate quantification. C_LI

genomics↗