Christian Thome studied Biology and Philosophy at the Universities of Heidelberg and Glasgow. He specialized in the areas of
Neuroscience and Philosophy of Mind and earned his PhD with his work on the prevalence, anatomy and physiology of
dendritic axon origins in hippocampal neurons. Building upon this work, he studied the development, plasticity and functional properties
of non-canonical axon morphologies at the Institute of Physiology and Pathophysiology at Heidelberg University (Germany) and at the Institute of Anatomy and Cell Biology in Linz University (Austria).
Brain and Learning Sciences
Current Research and Scholarly Interests
- Synaptic integration & neuronal excitability
- Structure-function relationships in neurons
- Circuit engineering for brain-machine interfaces
Dendritic axon origin enables information gating by perisomatic inhibition in pyramidal neurons.
Science (New York, N.Y.)
2022; 377 (6613): 1448-1452
Information processing in neuronal networks involves the recruitment of selected neurons into coordinated spatiotemporal activity patterns. This sparse activation results from widespread synaptic inhibition in conjunction with neuron-specific synaptic excitation. We report the selective recruitment of hippocampal pyramidal cells into patterned network activity. During ripple oscillations in awake mice, spiking is much more likely in cells in which the axon originates from a basal dendrite rather than from the soma. High-resolution recordings in vitro and computer modeling indicate that these spikes are elicited by synaptic input to the axon-carrying dendrite and thus escape perisomatic inhibition. Pyramidal cells with somatic axon origin can be activated during ripple oscillations by blocking their somatic inhibition. The recruitment of neurons into active ensembles is thus determined by axonal morphological features.
View details for DOI 10.1126/science.abj1861
View details for PubMedID 36137045
Myt1l haploinsufficiency leads to obesity and multifaceted behavioral alterations in mice.
2022; 13 (1): 19
BACKGROUND: The zinc finger domain containing transcription factor Myt1l is tightly associated with neuronal identity and is the only transcription factor known that is both neuron-specific and expressed in all neuronal subtypes. We identified Myt1l as a powerful reprogramming factor that, in combination with the proneural bHLH factor Ascl1, could induce neuronal fate in fibroblasts. Molecularly, we found it to repress many non-neuronal gene programs, explaining its supportive role to induce and safeguard neuronal identity in combination with proneural bHLH transcriptional activators. Moreover, human genetics studies found MYT1L mutations to cause intellectual disability and autism spectrum disorder often coupled with obesity.METHODS: Here, we generated and characterized Myt1l-deficient mice. A comprehensive, longitudinal behavioral phenotyping approach was applied.RESULTS: Myt1l was necessary for survival beyond 24h but not for overall histological brain organization. Myt1l heterozygous mice became increasingly overweight and exhibited multifaceted behavioral alterations. In mouse pups, Myt1l haploinsufficiency caused mild alterations in early socio-affective communication through ultrasonic vocalizations. In adulthood, Myt1l heterozygous mice displayed hyperactivity due to impaired habituation learning. Motor performance was reduced in Myt1l heterozygous mice despite intact motor learning, possibly due to muscular hypotonia. While anxiety-related behavior was reduced, acoustic startle reactivity was enhanced, in line with higher sensitivity to loud sound. Finally, Myt1l haploinsufficiency had a negative impact on contextual fear memory retrieval, while cued fear memory retrieval appeared to be intact.LIMITATIONS: In future studies, additional phenotypes might be identified and a detailed characterization of direct reciprocal social interaction behavior might help to reveal effects of Myt1l haploinsufficiency on social behavior in juvenile and adult mice.CONCLUSIONS: Behavioral alterations in Myt1l haploinsufficient mice recapitulate several clinical phenotypes observed in humans carrying heterozygous MYT1L mutations and thus serve as an informative model of the human MYT1L syndrome.
View details for DOI 10.1186/s13229-022-00497-3
View details for PubMedID 35538503