Haploinsufficiency of EHMT1 improves pattern separation and increases hippocampal cell proliferation

Contains fulltext : 169681.pdf (publisher's version ) (Open Access)Heterozygous mutations or deletions of the human Euchromatin Histone Methyltransferase 1 (EHMT1) gene are the main causes of Kleefstra syndrome, a neurodevelopmental disorder that is characterized by impaired memory, autistic features and mostly severe intellectual disability. Previously, Ehmt1+/- heterozygous knockout mice were found to exhibit cranial abnormalities and decreased sociability, phenotypes similar to those observed in Kleefstra syndrome patients. In addition, Ehmt1+/- knockout mice were impaired at fear extinction and novel- and spatial object recognition. In this study, Ehmt1+/- and wild-type mice were tested on several cognitive tests in a touchscreen-equipped operant chamber to further investigate the nature of learning and memory changes. Performance of Ehmt1+/- mice in the Visual Discrimination &Reversal learning, object-location Paired-Associates learning- and Extinction learning tasks was found to be unimpaired. Remarkably, Ehmt1+/- mice showed enhanced performance on the Location Discrimination test of pattern separation. In line with improved Location Discrimination ability, an increase in BrdU-labelled cells in the subgranular zone of the dentate gyrus was observed. In conclusion, reduced levels of EHMT1 protein in Ehmt1+/- mice does not result in general learning deficits in a touchscreen-based battery, but leads to increased adult cell proliferation in the hippocampus and enhanced pattern separation ability

eLearning and Embryology: Designing an Application to Improve 3D Comprehension of Embryological Structures

Embryology and histology are subjects that are viewed as particularly challenging by students in higher education. This negative perception is the result of many factors such as restricted access to lab facilities, lack of allocated time to these labs, and the complexity of the subject itself. One main factor that influences this viewpoint is the difficulty of grasping 3D orientation of sectioned tissues, especially regarding embryology. Attempts have been made previously to create alternative teaching methods to help alleviate these issues, but few have explored 3D visualisation. We aimed to address these issues by creating 3D embryological reconstructions from serial histology sections of a sheep embryo. These were deployed in a mobile application that allowed the user to explore the original sections in sequence, alongside the counterpart 3D model. The application was tested against a currently available eHistology programme on a cohort of life sciences graduates (n = 14) through qualitative surveys and quantitative testing through labelling and orientation-based tests. The results suggest that using a 3D modality such as the one described here significantly improves student comprehension of orientation of slides compared to current methods (p = 0.042). Furthermore, the developed application was deemed more interesting, useful, and usable than current eHistology tools (p < 0.05). Modalities such as that developed here could therefore provide a more effective approach to learning these challenging subjects potentially increasing student engagement with embryology and histology

eLearning and embryology: Designing an application to improve 3D comprehension of embryological structures

Embryology and histology are subjects that are viewed as particularly challenging by students in higher education. This negative perception is the result of many factors such as restricted access to lab facilities, lack of allocated time to these labs, and the complexity of the subject itself. One main factor that influences this viewpoint is the difficulty of grasping 3D orientation of sectioned tissues, especially regarding embryology. Attempts have been made previously to create alternative teaching methods to help alleviate these issues, but few have explored 3D visualisation. We aimed to address these issues by creating 3D embryological reconstructions from serial histology sections of a sheep embryo. These were deployed in a mobile application that allowed the user to explore the original sections in sequence, alongside the counterpart 3D model. The application was tested against a currently available eHistology programme on a cohort of life sciences graduates (n = 14) through qualitative surveys and quantitative testing through labelling and orientation-based tests. The results suggest that using a 3D modality such as the one described here significantly improves student comprehension of orientation of slides compared to current methods (p = 0.042). Furthermore, the developed application was deemed more interesting, useful, and usable than current eHistology tools (p &lt; 0.05). Modalities such as that developed here could therefore provide a more effective approach to learning these challenging subjects potentially increasing student engagement with embryology and histology