A novel locus on proximal chromosome 18 associated with agenesis of the corpus callosum in mice

Abstract

Agenesis of the corpus callosum (ACC) is a congenital abnormality of the brain structure. We have produced transgenic mice expressing both reverse tetracycline-controlled transactivator (rtTA) and transcriptional silencer (tTS) ubiquitously. Although the transgene products do not affect development of the mouse brain, one of the founder lines, TAS, showed ACC, suggesting transgenic disruption of endogenous gene(s). To identify the causative gene and its role in ACC, we performed pathological investigations of the brain and chromosomal mapping of foreign genes in TAS mice. Sixty-two percent of the heterozygous TAS mice showed ACC accompanied with formation of Probst bundles, as seen in human. Complete penetrance of ACC was observed in homozygous TAS mice. Furthermore, homozygous TAS fetuses revealed that ACC is a congenital anomaly. Moreover, axons of the corpus callosum were not repelled by the midline glial structures in TAS mice. These findings suggested that the causative gene for ACC is involved in critical steps in corpus callosum development. Multiple FISH analyses were performed to determine the site of transgene insertion. On 1-color FISH analyses, rtTA and tTS were detected on the A/B region of chromosome 18, suggesting cointegration of the transgenes. On 2-color FISH analyses, tTS signal was observed in a region from 9.3 to 16.9 Mb on chromosome 18. The TAS mice may serve as a useful model to identify a novel gene regulating corpus callosum development and to gain a new insight into molecular genetics of ACC.

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Acknowledgments

This study was supported by a grant (No. 21650086) from the Ministry of Education, Science, Sports, and Culture of Japan to FS. The authors thank the staff of the Laboratory Animal Resource Center, University of Tsukuba, for their excellent technical maintenance of TAS mice.

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Correspondence to Fumihiro Sugiyama.

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S. Mizuno, A. Mizobuchi, and H. Iseki contributed equally to this work.

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Expression of transgenes in transgenic mouse line 162. The tTS transgene was constitutively expressed in the cerebrum (lane 1), thymus (lane 3), lung (lane 4), liver (lane 6), kidney (lane 7), spleen (lane 8), small intestine (lane 9), and skeletal muscle (lane 10). The rtTA transgene was strongly expressed in the cerebrum and skeletal muscle. Weak expression of rtTA was observed in the thymus, lung, liver, kidney, spleen, and small intestine

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Mizuno, S., Mizobuchi, A., Iseki, H. et al. A novel locus on proximal chromosome 18 associated with agenesis of the corpus callosum in mice. Mamm Genome 21, 525–533 (2010). https://doi.org/10.1007/s00335-010-9292-4

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Keywords

  • Corpus Callosum
  • Commissural Axon
  • Complete Penetrance
  • Rostral Forebrain
  • Callosal Defect