Abstract
Linkage studies have identified susceptibility loci for familial nonmedullary thyroid cancer (FNMTC), with and without cell oxyphilia, at chromosomal regions 19p13.2 and 2q21. There are few genetic analyses of FNMTC tumours reported at the present time and the eventual gene involved was not identified yet. The aim of this study was to assess the occurrence of loss of heterozygosity (LOH) at these loci in the tumours from familial clusters of NMTC. We have analysed LOH in 14 tumours from 9 two-case familial clusters of NMTC. Using paired blood (normal) and tumour DNA samples, we have genotyped ten microsatellite and one SNP markers throughout 19p13.2 and fourteen microsatellite markers at 2q21. Overall, eight (57%) and two (14%) out of the fourteen tumours analysed exhibited LOH at 19p13.2 and 2q21, respectively. In two families (22%), LOH for the same markers was demonstrable in the tumours of the two members of the same family. In one family (11%) LOH was demonstrable at both loci analysed. In four two-case familial clusters (44%), LOH at the 19p13.2 locus was found in only one of the tumour cases analysed. Detailed haplotype analysis showed that, in two families (22%), the pattern of LOH in tumours was consistent with selective retention of the haplotype shared by affected members. In the remaining cases, it was consistent with random allelic losses. In conclusion, we report the finding of LOH at the 19p13.2 and 2q21 loci in tumours from familial clusters of NMTC, providing evidence that inactivation of putative genes in these regions, acting as tumour-suppressors, may be involved in the development of tumours in the context of FNMTC.
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Abbreviations
- BL:
-
BiLateral
- CO:
-
Cell Oxyphilia
- FA:
-
Follicular Adenoma
- FFPE:
-
Formalin Fixed Paraffin Embedded Tissue
- FNMTC:
-
Familial Non-Medullary Thyroid Carcinoma
- FTC:
-
Follicular Thyroid Carcinoma
- FV:
-
Follicular Variant of Papillary Thyroid Carcinoma
- LOH:
-
Loss-of-heterozygosity
- MF:
-
MultiFocal
- MNG:
-
MultiNodular Goitre
- N:
-
Normal DNA
- NMTC:
-
Non-Medullary Thyroid Carcinoma
- PBL:
-
Peripheral Blood Leukocyte
- PTC:
-
Papillary Thyroid Carcinoma
- SNP:
-
Single Nucleotide Polymorphism
- SSCP:
-
Single Strand Conformation Polymorphism
- T:
-
Tumour DNA
- WLV:
-
Warthin-Like Variant
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Acknowledgments
We acknowledge the financial support for this work by grants awarded by the “Edward Limbert Prize for Thyroid Pathology” of the Portuguese Society of Endocrinology Diabetes and Metabolism (SPEDM), and the funding from the Portuguese Ministry of Health (“Comissão de Fomento da Investigação em Cuidados de Saúde”). We thank all patients and family members that have participated in this study. We thank Dr. Maria Madalena Barroso, MD and Dr. Leonor Gomes, MD (University Hospitals of Coimbra), Dr. Lígia Prado e Castro, MD (Hospital Centre of Coimbra) and Dr. Teresa Carvalho, MD (Hospital of Viseu) for providing FFPE tissue and clinical information on some of the patients included in this study.
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Prazeres, H.J., Rodrigues, F., Soares, P. et al. Loss of heterozygosity at 19p13.2 and 2q21 in tumours from familial clusters of non-medullary thyroid carcinoma. Familial Cancer 7, 141–149 (2008). https://doi.org/10.1007/s10689-007-9160-x
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DOI: https://doi.org/10.1007/s10689-007-9160-x