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Rat tropoelastin is synthesized from a 3.5-kilobase mRNA
S B Deak1, R A Pierce, S A Belsky
1Department of Surgery, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick 08903.
Abstract:
A lambda gt11 cDNA library was constructed from poly(A+) RNA isolated from aortic tissue of neonatal rats and screened with a human tropoelastin cDNA clone. DNA sequence analysis of several overlapping rat clones confirmed the presence of DNA sequences coding for murine tropoelastin and DNA sequences coding for the 3'-untranslated region of the rat tropoelastin mRNA. Northern blot analysis of total RNA from aortic tissue of neonatal rats using oligonucleotide probes derived from these rat tropoelastin cDNAs demonstrated the presence of a 3.5-kilobase tropoelastin mRNA. The size of this rat tropoelastin mRNA agrees with previous reports for the size of the mRNA coding for tropoelastin in tissue from several vertebrate species but contrasts with several reports suggesting the presence of a higher molecular weight mRNA species responsible for the synthesis of tropoelastin in rodent tissue.