Novel intronic mutation of MEN1 gene causing familial isolated primary hyperparathyroidism.
Primary hyperparathyroidism may occur as part of hereditary syndromes, including multiple endocrine neoplasia types 1 and 2A (MEN1 and MEN2A), hyperparathyroidism-jaw tumor syndrome, and the familial isolated hyperparathyroidism (FIHP). It is unclear whether FIHP corresponds to a different genetic entity or a variant of MEN1 (or hyperparathyroidism-jaw tumor syndrome). We report a patient and 11 family members with FIHP in whom we identified a heterozygous G-to-A mutation at nucleotide 7361 of tumor suppressor MEN1 gene. This mutation is located in the first base of intron 9 (IVS9 + 1 G>A). All the family members with hyperparathyroidism were heterozygous for the intronic mutation. In vitro studies were performed in COS cells transfected with minigenes carrying the coding regions spanning exon-intron 9 and 10 with the mutant and the wild-type sequences. RT-PCR analyses showed an abnormal mRNA of greater size (829 bp) in the mutated MEN1 gene than the normal transcript (629 bp). The longer PCR product includes the exon 9, the unspliced intron 9, and part of exon 10. RT-PCR of MEN1 mRNA from patient's blood confirmed the existence of unspliced intron 9 in mature mRNA. In summary, we report a case of FIHP associated with a new intronic heterozygous germline mutation (IVS9 + 1 G>A) of MEN1 gene. This mutation produces an aberrant splicing of mRNA that could lead to a truncated protein, without activity, explaining the clinical picture of this patient and his family.
Carrasco
Carmen A
CA
Department of Endocrinology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Lira 85, piso 5, Santiago, Chile.
González
Alexis A
AA
Carvajal
Cristian A
CA
Campusano
Claudia
C
Oestreicher
Eveline
E
Arteaga
Eugenio
E
Wohllk
Nelson
N
Fardella
Carlos E
CE
D000225:Adenine; D000818:Animals; D001483:Base Sequence; D019556:COS Cells; D015870:Gene Expression; D018095:Germ-Line Mutation; D006147:Guanine; D006579:Heterozygote; D006801:Humans; D006961:Hyperparathyroidism / Q000097:blood / Q000235:genetics*; D007438:Introns; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D011518:Proto-Oncogene Proteins / Q000097:blood / Q000235:genetics*; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
C105373:MEN1 protein, human; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D006147:Guanine; D000225:Adenine