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Demonstration of a heterogeneous transcription pattern of thyroglobulin mRNA in human thyroid tissues
F Bertaux1, M Noel, Y Malthiéry
1INSERM U66, Institut Gustave Roussy, Villejuif, France.
Abstract:
Previous reports on human thyroglobulin (hTg) modifications in thyroid carcinomas prompted us to study hTg mRNA in thyroid adenomas and carcinomas. The quantification of hTg mRNA showed a decrease in its levels of expression in both pathological conditions which differed by a factor of 2 between adenomas and carcinomas. Furthermore, PCR was used to analyse the characteristics of hTg mRNA by amplifying 4 regions of the hTg mRNA. When applied to 2 normal, 17 benign and 13 malignant pathological tissue specimens, PCR showed no modification in the size of Tg mRNA. However, abnormal sized cDNAs appeared in all tissues with no distinction between the pathologies; the Restriction Fragment Length Polymorphism study of these cDNAs suggests the existence of alternate splicing patterns in thyroglobulin mRNAs.
Insights
Thyroid adenomas and carcinomas show reduced human thyroglobulin (hTg) mRNA expression. Analysis revealed abnormal cDNA sizes, suggesting alternative splicing in hTg mRNA across thyroid pathologies.
Area of Science:
- Molecular Biology
- Endocrinology
- Oncology
Background:
- Thyroid carcinomas are associated with human thyroglobulin (hTg) modifications.
- Understanding hTg mRNA expression is crucial for diagnosing thyroid conditions.
Purpose of the Study:
- To investigate hTg mRNA expression levels and characteristics in thyroid adenomas and carcinomas.
- To identify potential molecular alterations in hTg mRNA in benign and malignant thyroid tissues.
Main Methods:
- Quantitative analysis of hTg mRNA levels.
- Polymerase Chain Reaction (PCR) to analyze hTg mRNA structure.
- Restriction Fragment Length Polymorphism (RFLP) to study cDNA variations.
Main Results:
- A significant decrease in hTg mRNA expression was observed in both adenomas and carcinomas, with expression levels twice as low in carcinomas compared to adenomas.
- PCR analysis showed no change in the size of hTg mRNA across normal, benign, and malignant tissues.
- Abnormal sized cDNAs were detected in all tested tissues, irrespective of pathology.
- RFLP analysis of these cDNAs indicated the presence of alternative splicing patterns in thyroglobulin mRNAs.
Conclusions:
- hTg mRNA expression is downregulated in thyroid adenomas and carcinomas.
- Alternative splicing of thyroglobulin mRNA occurs in thyroid tissues, potentially contributing to disease pathology.