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Related Experiment Videos

Thyrotropin regulates thyroglobulin mRNA splicing and differential processing

P N Graves1, T F Davies

  • 1Department of Medicine, Mount Sinai School of Medicine, New York, New York.

Molecular and Cellular Endocrinology
|June 1, 1993
PubMed
Summary
This summary is machine-generated.

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Two thyroglobulin (Tg) messenger RNA (mRNA) variants, rTg-1 and rTg-2, originate from a single rat gene. Thyroid-stimulating hormone (TSH) differentially regulates these Tg mRNAs through TSH-induced splicing.

Area of Science:

  • Molecular Endocrinology
  • Gene Regulation
  • Thyroid Biology

Background:

  • Rat thyroid tissue expresses two thyroglobulin (Tg) messenger RNA (mRNA) transcripts: a 9 kb rTg-1 and a 0.95 kb rTg-2.
  • These mRNAs share identical 5' coding sequences, but rTg-2 possesses unique 3' coding and non-coding regions not found in rTg-1.

Purpose of the Study:

  • To investigate whether a single thyroglobulin gene encodes both rTg-1 and rTg-2 mRNA species.
  • To elucidate the regulatory mechanisms controlling the expression of these two Tg mRNA variants.

Main Methods:

  • Isolation and characterization of a genomic clone spanning the full-length rTg-2 cDNA.
  • Comparison of promoter sequences and restriction maps of rTg-1 and rTg-2 genes.
  • Analysis of rTg-2 mRNA levels in cultured rat thyrocytes under varying thyroid-stimulating hormone (TSH) conditions.

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Main Results:

  • The genomic analysis confirmed that rTg-1 and rTg-2 mRNAs are splicing variants derived from the same Tg gene.
  • The unique 3' end of rTg-2 mRNA corresponds to a single exon that is intronic in rTg-1 mRNA formation.
  • rTg-2 mRNA expression demonstrated higher sensitivity to TSH regulation compared to rTg-1, with rapid depletion upon TSH removal and restoration upon TSH reintroduction.

Conclusions:

  • Thyroglobulin mRNAs rTg-1 and rTg-2 are generated from a single gene through alternative splicing.
  • Thyroid-stimulating hormone (TSH) plays a crucial role in regulating the splicing and expression levels of these two Tg mRNA variants in rats.