cDNA cloning of a murine homologue of Drosophila single-minded, its mRNA expression in mouse development, and chromosome localization

Masatsugu Ema, Michiko Suzuki, Masanobu Morita, Ken Hirose, Kazuhiro Sogawa, Youich Matsuda, Osamu Gotoh, Yukio Saijoh, Hideta Fujii, Hiroshi Hamada, Yoshiaki Fujii-Kuriyama

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


A combination of the RT-PCR method and subsequent screening of the cDNA library of mouse skeletal muscle with the cDNA isolated by RT-PCR used as a probe led to isolation of cDNAs encoding a polypeptide (mSim) with bHLH and PAS domains which show high similarity to the corresponding regions of Drosophila Sim, a master regulator in neurogenesis. Experiments using a GST-fusion protein demonstrated that mSim heterodimerizes with Arnt (Ah receptor nuclear translocator), even more efficiently than AhR (Ah receptor) does with Arnt. RNA blot analysis using RNAs from various tissues of mice indicated that mSim transcript is expressed in several limited tissues such as muscle, kidney and lung of adult animals. Distribution of mSim mRNA was always accompanied with that of Arnt. All the results suggest a regulatory role of mSim in partnership with Arnt. Chromosomal location of the mSim gene was determined by fluorescent in situ hybridization to be localized on the C3.3-C4 band of mouse chromosome 16 which is syntenic with the human chromosome 21q22 carrying the Down syndrome critical region, where a gene highly homologous to tile Drosophila sim was localized. Whole mount in situ hybridization using a unique part of mSim cDNA sequence showed that mSim mRNA was expressed in the ventral diencephalon, branchial arches and limbs. These findings will provide an approach to the cause of the Down syndrome as well as the elucidation of the functional roles of mSim in animal development.

Original languageEnglish
Pages (from-to)588-594
Number of pages7
JournalBiochemical and biophysical research communications
Issue number2
Publication statusPublished - 1996 Jan 17

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


Dive into the research topics of 'cDNA cloning of a murine homologue of Drosophila single-minded, its mRNA expression in mouse development, and chromosome localization'. Together they form a unique fingerprint.

Cite this