Crusio and his collaborators found that neuroanatomical variations in the mouse hippocampus, in particular the sizes of their intra- and infrapyramidal mossy fibers (IIPMF) correlated with learning performance.[11] Together with Herbert Schwegler and Hans-Peter Lipp, Crusio showed that an inverse correlation, that is, animals with larger IIPMF learn better, could be found for spatial learning in a radial arm maze task.[12][13][14] Taken together, Crusio and collaborators think that it is highly likely that this correlation is causal,[15] although this is not universally accepted.[16]
Mouse model of depression
When mice are exposed to unpredictable chronic mild stress (UCMS), they start exhibiting symptoms reminiscent of major depressive disorder in humans.[17] As it had been suggested that deficits in hippocampal neurogenesis might underlie depression,[18] Crusio and collaborators undertook a series of experiments investigating changes in behavior and neurogenesis in mice that had undergone UCMS. They showed dramatic changes in levels of aggression,[19]anxiety,[20][21] depressive-like behaviors,[20] and learning,[22] with a concomitant drop in neurogenesis.[22] However, the results were strain- and sex-specific and there did not appear to be a clear-cut correlation between the different changes, so that they finally concluded that although their data do not disprove the idea that deficits in hippocampal neurogenesis solely underlie the behavioral impairments observed in human psychiatric disorders such as depression, they do not provide support for this hypothesis either.[22]
Mouse model of autism
More recently, Crusio has been investigating the possibility that Fmr1knockout mice might perhaps be used as a model for autism. This idea is based on the fact that patients suffering from the Fragile X syndrome, caused by a deficiency of the FMR1 gene often show autistic symptoms. A good mouse model for the Fragile X syndrome is available in the form of mice in which the Fmr1 gene (the mouse homologue of the human FMR1 gene) has been invalidated.[23] A review of the findings obtained with these mice in many different laboratories did indeed indicate that these animals display autistic-like symptoms,[24] especially changes in social behavior, a key symptom of autism.[25][26]
According to Google Scholar, Crusio's works have been cited over 10,000 times and he has an h-index of 46.[57] Some significant papers are:
Crusio, W. E.; Genthner-Grimm, G.; Schwegler, H. (2007). "A quantitative-genetic analysis of hippocampal variation in the mouse". Journal of Neurogenetics. 21 (4, Special Retrospective Issue: The Origins of Neurogenetics): 197–208. doi:10.1080/01677060701715827. PMID18161583. S2CID7334116. Original publication: Crusio, W. E.; Genthner-Grimm, G.; Schwegler, H. (July 1986). "A quantitative-genetic analysis of hippocampal variation in the mouse". Journal of Neurogenetics. 3 (4): 203–214. doi:10.3109/01677068609106850. PMID3746523.
Crusio, W. E.; Schwegler, H.; Lipp, H. P. (November 1987). "Radial-maze performance and structural variation of the hippocampus in mice: a correlation with mossy fibre distribution". Brain Research. 425 (1): 182–185. doi:10.1016/0006-8993(87)90498-7. PMID3427419. S2CID39198617.
^"Crusio Wim". The Aquitaine Institute for Cognitive and Integrative Neuroscience. Archived from the original on 21 October 2014. Retrieved 29 December 2012.
^Schwegler, H; Crusio, W. E.; Brust, I (1990). "Hippocampal mossy fibers and radial-maze learning in the mouse: a correlation with spatial working memory but not with non-spatial reference memory". Neuroscience. 34 (2): 293–298. doi:10.1016/0306-4522(90)90139-U. PMID2333144. S2CID9557091.
^Crusio, WE; Gerlai, RT (1999). Handbook of Molecular-Genetic Techniques for Brain and Behavior Research. Amsterdam: Elsevier. pp. xxvii+965. ISBN978-0-444-50239-1.
^Loehlin, John (1 April 2009). "History of behavior genetics". In Kim, Yong-Kyu (ed.). Handbook of Behavior Genetics. Berlin: Springer. pp. 3–11. ISBN978-0-387-76726-0. Archived from the original on 2 October 2021. Retrieved 17 December 2020.
"Crusio Wim". Homepage. The Aquitaine Institute for Cognitive and Integrative Neuroscience. Archived from the original on 21 October 2014. Retrieved 12 January 2012.
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