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Department of Endocrinology, Institut Cochin, Institut National de la Santé et de la Recherche Médicale U567, CNRS UMR8104, Université Paris V, Hôpital Cochin, Paris 75014, France [J. B., L. G., C. V-D., K. P., X. B.]; Section on Endocrinology and Genetics, Developmental Endocrinology Branch, National Institute of Child Health and Human Development, NIH, Bethesda, Maryland 20892 [F. S., L. M., T. B., I. B., C. A. S.]; and COMETE Network [J. B., L. G., C. G., X. B.] and Laboratoire dExplorations Fonctionnelles Endocriniennes [C. G.], Hôpital Trousseau, Paris 75012, France
Germ-line protein kinase A (PKA) regulatory-subunit type-I
(RI
; PRKAR1A)-inactivating mutations and loss-of-heterozygosity (LOH) of its 17q2224 locus have been found in Cushing syndrome (CS) caused by primary pigmented nodular adrenocortical disease (PPNAD). We examined whether somatic 17q2224, PRKAR1A, or PKA changes are present in 44 sporadic adrenocortical tumors (29 adenomas and 15 cancers); 26 of these tumors were responsible for CS. A probe containing the PRKAR1A genemapped by fluorescent in situ hybridization to 17q2224and corresponding microsatellite markers were used to study allelic losses; PRKAR1A was sequenced in all samples. 17q2224 losses were seen in 23 and 53% of adenomas and cancers, respectively. In three tumors, somatic, PRKAR1A-inactivating mutations were identified: (a) a nonsense mutation in exon 6 (A751G); (b) a splicing mutation (9IVS-1G/A); and (c) a transition (1050T>C) followed by a 22-bp deletion, also in exon 9; all predicted premature RI
protein terminations. Quantitative message and protein studies showed RI
down-regulation in tumors with genetic changes; their cortisol secretion pattern was similar to that of PPNAD, and they had higher PKA activity by enzymatic studies. We conclude that somatic allelic losses of the 17q2224 region, PRKAR1A-inactivating mutations or down-regulation, and corresponding PKA activity changes are present in at least some sporadic adrenocortical tumors, especially those with a PPNAD-like clinical presentation of CS.
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