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Transgene 6A-99 is a molecular marker of developing somatosensory cortex in mice

  • Developmental Genetics
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Abstract

Among dozens of known genes, active in the developing cortex, very few possessed expression strictly limited by one functional area of the cortex. We found that in 6A-99 transgenic mice, LacZ-reported gene was expressed selectively in the somatosensory cortex. In the primary somatosensory cortex, expression was localized in the barrel field, including the zone of representation of vibrissae, fore and hind limbs, jaws, and head. In addition, LacZ-expressing cells were found in the secondary somatosensory cortex, as well as in the nuclei of hypothalamus and dorsal and caudal raphe nuclei. In the cortex, expression of transgene 6A-99 began on day 3 of postnatal development (P3) and embraced only the area of primary somatosensory cortex: zones of representation of the snout, vibrissae, and lower jaw. On P5, pronounced expression 6A-99 was detected in the secondary somatosensory cortex and zone of representation of fore paws. Expression in the zone of representation of hind paws was observed on P7. Expression of 6A-99 in the somatosensory cortex disappeared by P50, the age of final functional maturation of the cerebral cortex. Our results suggest that the regulation of transcription in the developing mouse somatosensory cortex differs from those in other cortical areas. Transgene 6A-99 may serve as a specific molecular marker of the developing somatosensory cortex in mice and can be used for studying the mechanisms underlying genetic and epigenetic control of the neocortex functional regionalization.

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Authors and Affiliations

  1. Anoknin Institute of Normal Physiology, Russian Academy of Medical Sciences, ul. Mokhovaya 11/4, Moscow, 125009, Russia

    A. A. Lazutkin & K. V. Anokhin

  2. Max Planck Institute of Biophysical Chemistry, Am Fassberg 11, D-37077, Göttingen, Germany

    B. I. Meyer

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  1. A. A. Lazutkin
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  2. B. I. Meyer
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Original Russian Text © A.A. Lazutkin, B.I. Meyer, K.V. Anokhin, 2007, published in Ontogenez, 2007, Vol. 38, No. 1, pp. 21–32.

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Lazutkin, A.A., Meyer, B.I. & Anokhin, K.V. Transgene 6A-99 is a molecular marker of developing somatosensory cortex in mice. Russ J Dev Biol 38, 15–24 (2007). https://doi.org/10.1134/S1062360407010031

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