TY - JOUR
T1 - Generation of skeletal, smooth and low molecular weight non-muscle tropomyosin isoforms from the chicken tropomyosin 1 gene
AU - Forry-Schaudies, Suzanne
AU - Maihle, Nita J.
AU - Hughes, Stephen H.
N1 - Funding Information:
We thank Hilda Marusiodis for expert secretarial assistance. S.F.S. and N.J.M. were supported by postdoctoral fellowships from the Muscular Dystrophy Association. The research was sponsored by the National Cancer Institute; DHHS, under contract no. NOl-CO-74101 with BRI. The contents of this publication do not necessarily reflect the views or policies of the Department of Health and Human Services. nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.
PY - 1990/1/20
Y1 - 1990/1/20
N2 - We have determined the organization of the chicken tropomyosin 1 gene by sequencing the cloned genomic DNA. The single-copy gene spans approximately 11,000 bases and includes 12 exons. Comparison of cDNA and genomic sequences demonstrates that three tissuespecific tropomyosins are encoded by the gene: a 284 amino acid skeletal muscle β-tropomyosin, a 284 amino acid smooth muscle tropomyosin, and a 248 amino acid nonmuscle (fibroblast) β-tropomyosin. Skeletal and smooth muscle transcripts use the same putative promoter and transcription initiation site. However, they are alternatively spliced to generate mRNAs that differ in the region giving rise to amino acids 188 to 213 and 258 through the poly(A) site. The fibroblast transcript uses a promoter, initiation site and first exon that is distinct from that used for both the smooth and the skeletal muscle transcripts. However, beyond the first exon the fibroblast transcript undergoes splicing and polyadenylation that is identical with the smooth muscle transcript.
AB - We have determined the organization of the chicken tropomyosin 1 gene by sequencing the cloned genomic DNA. The single-copy gene spans approximately 11,000 bases and includes 12 exons. Comparison of cDNA and genomic sequences demonstrates that three tissuespecific tropomyosins are encoded by the gene: a 284 amino acid skeletal muscle β-tropomyosin, a 284 amino acid smooth muscle tropomyosin, and a 248 amino acid nonmuscle (fibroblast) β-tropomyosin. Skeletal and smooth muscle transcripts use the same putative promoter and transcription initiation site. However, they are alternatively spliced to generate mRNAs that differ in the region giving rise to amino acids 188 to 213 and 258 through the poly(A) site. The fibroblast transcript uses a promoter, initiation site and first exon that is distinct from that used for both the smooth and the skeletal muscle transcripts. However, beyond the first exon the fibroblast transcript undergoes splicing and polyadenylation that is identical with the smooth muscle transcript.
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U2 - 10.1016/0022-2836(90)90354-O
DO - 10.1016/0022-2836(90)90354-O
M3 - Article
C2 - 2308161
AN - SCOPUS:0025057161
SN - 0022-2836
VL - 211
SP - 321
EP - 330
JO - Journal of Molecular Biology
JF - Journal of Molecular Biology
IS - 2
ER -