Abstract:
: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 the 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.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Ema M,Suzuki M,Morita M,Hirose K,Sogawa K,Matsuda Y,Gotoh O,Saijoh Y,Fujii H,Hamada H,Fujii-Kuriyama Ydoi
10.1006/bbrc.1996.0104subject
Has Abstractpub_date
1996-01-17 00:00:00pages
588-94issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(96)90104-7journal_volume
218pub_type
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