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Schulte, K.M. et al.

Schulte, Heinze, Mengel, Scheuring, Köhrer, Röher,

Complete sequencing and mRNA expression analysis of the MEN-I gene in adrenal myelolipoma.

The molecular pathogenesis of adrenal myelolipoma is unclear. Endocrine activity of these tumors and association with other endocrine tumors have stimulated the hypothesis that it may belong to the group of sporadic tumors caused by defects of the gene responsible for multiple endocrine neoplasia type I (MEN-I). DNA of blood and tumoral sections from two patients with adrenal myelolipoma were analyzed by examination of variable number of tandem repeats (VNTR) loci PYGM, D11S987, D11S480, and D11S449 on chromosome 11q13 and by complete direct DNA sequencing of all coding exons and splice junctions of the MEN-I gene. Menin expression was examined by RT-PCR. RT-PCR did not detect menin expression in one adrenal myelolipoma. No loss of heterozygozity on chromosome 11q13 was identified. Intragenic heterozygozity was retained in codon 418 of the menin gene in both patients. No mutation was identified in the coding exons of the menin gene. Complete DNA sequencing yielded no hint that defects of the MEN-I gene are responsible for the formation of adrenal myelolipomas. Adrenal myelolipomas do not share the loss of heterozygozity on chromosome 11q13 observed in some benign adenomatous and many malignant adrenocortical tumors.[1]

References

Complete sequencing and mRNA expression analysis of the MEN-I gene in adrenal myelolipoma. Schulte, K.M., Heinze, M., Mengel, M., Scheuring, S., Köhrer, K., Röher, H.D. Horm. Metab. Res. (2000) [Pubmed]

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