scholarly journals Loss of Wild-Type MEN1 Gene Expression in Multiple Endocrine Neoplasia Type 1-Associated Parathyroid Adenoma.

1999 ◽  
Vol 46 (4) ◽  
pp. 539-544 ◽  
Author(s):  
LEOPOLD LUDWIG ◽  
LOTHAR SCHLEITHOFF ◽  
HEIDI KESSLER ◽  
PETER K. WAGNER ◽  
BERNHARD O. BOEHM ◽  
...  
Keyword(s):  
Gene Expression ◽  
Parathyroid Adenoma ◽  
Multiple Endocrine Neoplasia ◽  
Multiple Endocrine Neoplasia Type ◽  
Wild Type ◽  
Men1 Gene ◽  
Endocrine Neoplasia ◽  
Endocrine Neoplasia Type

scholarly journals Multiple endocrine neoplasia type 1 gene expression is normal in sporadic adrenocortical tumors

2000 ◽  
pp. 689-695 ◽  
Author(s):  
O Zwermann ◽  
F Beuschlein ◽  
P Mora ◽  
G Weber ◽  
B Allolio ◽  
...  
Keyword(s):  
Gene Expression ◽  
Mrna Expression ◽  
Multiple Endocrine Neoplasia ◽  
Multiple Endocrine Neoplasia Type ◽  
Adrenocortical Tumors ◽  
Men1 Gene ◽  
Endocrine Neoplasia ◽  
Endocrine Neoplasia Type ◽  
Adrenocortical Carcinomas

Multiple endocrine neoplasia type 1 (MEN1) is an autosomal dominant disorder with neoplasia of the anterior pituitary, the parathyroid, the endocrine pancreas and other endocrine tissues including the adrenal cortex. The tumor-suppressor gene causing this disease was identified at the gene locus 11q13. We recently reported that adrenocortical carcinomas frequently show loss of heterozygosity (LOH) of 11q13, but do not contain point mutations within the MEN1-coding region. To investigate whether reduced gene expression (for example by mutations within the MEN1 promoter) may contribute to the tumorigenesis of sporadic adrenocortical tumors, 24 adrenocortical specimen were studied by Northern blot analysis. This series included six adrenocortical carcinomas, four cortisol-producing adenomas, six aldosterone-producing adenomas, three endocrine-inactive adenomas and six normal adrenal glands. The presence of LOH of 11q13 was investigated using five polymorphic microsatellite markers (D11S956, PYGM, D11S4939, D11S4946 and D11S987) close to the MEN1 gene. Poly-A mRNA was hybridized with a PCR-generated cDNA probe of the MEN1 gene, a cDNA of the former MEN1 candidate gene phospholipase (PLC) beta3 and a mouse beta-actin cDNA for normalization. LOH of 11q13 was detected in five out of six carcinomas and two inactive adenomas, but in none of the hormone-producing adenomas. Compared with normal adrenals (100+/-6. 5%, mean+/-s.e.m.) MEN1 mRNA in adrenocortical tumors was expressed in similar amounts (carcinomas 109+/-11%, cortisol-producing adenomas 131+/-10%, aldosterone-producing adenomas 113+/-13%, endocrine-inactive adenomas 111+/-2%) with the exception of one adrenocortical carcinoma with low MEN1 mRNA expression (66%). PLCbeta3 mRNA expression showed a variable pattern without reaching significant differences between the groups. We conclude that since mRNA levels were unaltered in the majority of tumors, mutations of the MEN1 gene causing altered gene transcription is unlikely to be a major pathogenic factor of sporadic adrenocortical tumors.

scholarly journals Role of miR-24 in Multiple Endocrine Neoplasia Type 1: A Potential Target for Molecular Therapy

2021 ◽  
Vol 22 (14) ◽  
pp. 7352
Author(s):  
Francesca Marini ◽  
Maria Luisa Brandi
Keyword(s):  
Multiple Endocrine Neoplasia ◽  
Multiple Endocrine Neoplasia Type ◽  
Current Knowledge ◽  
Neuroendocrine Cells ◽  
Molecular Therapy ◽  
Multiple Cancer ◽  
Men1 Gene ◽  
Endocrine Neoplasia ◽  
Endocrine Neoplasia Type

Multiple endocrine neoplasia type 1 (MEN1) is a rare autosomal dominant inherited multiple cancer syndrome of neuroendocrine tissues. Tumors are caused by an inherited germinal heterozygote inactivating mutation of the MEN1 tumor suppressor gene, followed by a somatic loss of heterozygosity (LOH) of the MEN1 gene in target neuroendocrine cells, mainly at parathyroids, pancreas islets, and anterior pituitary. Over 1,500 different germline and somatic mutations of the MEN1 gene have been identified, but the syndrome is completely missing a direct genotype-phenotype correlation, thus supporting the hypothesis that exogenous and endogenous factors, other than MEN1 specific mutation, are involved in MEN1 tumorigenesis and definition of individual clinical phenotype. Epigenetic factors, such as microRNAs (miRNAs), are strongly suspected to have a role in MEN1 tumor initiation and development. Recently, a direct autoregulatory network between miR-24, MEN1 mRNA, and menin was demonstrated in parathyroids and endocrine pancreas, showing a miR-24-induced silencing of menin expression that could have a key role in initiation of tumors in MEN1-target neuroendocrine cells. Here, we review the current knowledge on the post-transcriptional regulation of MEN1 and menin expression by miR-24, and its possible direct role in MEN1 syndrome, describing the possibility and the potential approaches to target and silence this miRNA, to permit the correct expression of the wild type menin, and thereby prevent the development of cancers in the target tissues.

scholarly journals Germline MEN1 mutations in sixteen Japanese families with multiple endocrine neoplasia type 1 (MEN1)

1999 ◽  
pp. 475-480 ◽  
Author(s):  
N Hai ◽  
N Aoki ◽  
A Matsuda ◽  
T Mori ◽  
S Kosugi
Keyword(s):  
Multiple Endocrine Neoplasia ◽  
Multiple Endocrine Neoplasia Type ◽  
Family Members ◽  
Premature Stop Codon ◽  
Germline Mutations ◽  
Endocrine Tumors ◽  
Men1 Gene ◽  
Endocrine Neoplasia ◽  
Endocrine Neoplasia Type

OBJECTIVE: Multiple endocrine neoplasia type 1 (MEN1) is a syndrome of endocrine tumors involving the parathyroids, anterior pituitary and enteropancreatic neuroendocrine tissues, and is inherited in an autosomal dominant manner. Recently, the gene responsible for this syndrome, MEN1, was positionally cloned in 11q13. We aimed to assess the significance of MEN1 gene diagnostics in families with MEN1. DESIGN: Sixteen probands of familial MEN1 and their 40 family members were subjected to the study. METHODS: Full-length sequencing of the open reading frame and exon-intron boundaries in the MEN1 gene was performed with probands of familial MEN1. Family members were examined for the identified mutation in the proband. RESULTS: We identified heterozygous germline mutations of the MEN1 gene in all of 16 Japanese MEN1 families examined, achieving the highest detectability of MEN1 mutations in familial MEN1 among studies that examined more than 10 families. Eleven kinds of the identified MEN1 germline mutations were novel. More than half were nonsense or frameshift mutations resulting in a premature stop codon (9/15; 60%), and no mutation hot spots or no apparent genotype-phenotype relationships were observed, in support of the results of other studies. We identified 40 mutant MEN1 gene carriers and 16 non-carriers in the course of the present study in those families. CONCLUSIONS: Analysis of the germline mutations in the MEN1 gene, providing significantly useful clinical information to probands and family members of MEN1, should be considered as a standard procedure and categorized as belonging to Group 1 cancer predisposition testing by the American Society of Clinical Oncology.

scholarly journals Multiple endocrine neoplasia type 1 (MEN1) gene mutations in a subset of patients with sporadic and familial primary hyperparathyroidism target the coding sequence but spare the promoter region

2000 ◽  
Vol 166 (1) ◽  
pp. 1-9 ◽  
Author(s):  
W Karges ◽  
K Jostarndt ◽  
S Maier ◽  
A Flemming ◽  
M Weitz ◽  
...  
Keyword(s):  
Multiple Endocrine Neoplasia ◽  
Multiple Endocrine Neoplasia Type ◽  
Germ Line ◽  
Single Strand Conformational Polymorphism ◽  
Coding Sequence ◽  
Men1 Gene ◽  
Endocrine Neoplasia ◽  
Endocrine Neoplasia Type ◽  
Germ Line Mutations

Germ line mutations of the multiple endocrine neoplasia type 1 (MEN1) tumour suppressor gene cause MEN1, a rare familial tumour syndrome associated with parathyroid hyperplasia, adenoma and hyperparathyroidism (HP). Here we investigated the role of the MEN1 gene in isolated sporadic and familial HP. Using RT-PCR single-strand conformational polymorphism screening, somatic (but not germ line) mutations of the MEN1 coding sequence were identified in 6 of 31 (19.3%) adenomas from patients with sporadic primary HP, but none in patients (n=16) with secondary HP due to chronic renal failure. MEN1 mutations were accompanied by a loss of heterozygosity (LOH) for the MEN1 locus on chromosome 11q13 in the adenomas as detected by microsatellite analysis. No DNA sequence divergence within the 5' region of the MEN1 gene, containing the putative MEN1 promoter, was detectable in HP adenomas. Clinical characteristics were not different in HP patients with or without MEN1 mutation. Heterozygous MEN1 gene polymorphisms were identified in 9.6% and 25% of patients with primary and secondary HP respectively. In a large kindred with familial isolated familial HP, MEN1 germ line mutation 249 del4 and LOH was associated with the HP phenotype and a predisposition to non-endocrine malignancies. We suggest that the bi-allelic somatic loss of MEN1 wild-type gene expression is involved in the pathogenesis of a clinically yet undefined subset of sporadic primary HP adenomas. MEN1 genotyping may further help define the familial hyperparathyroidism-MEN1 disease complex, but it seems dispensable in sporadic primary HP.

scholarly journals A Novel Germline Mutation of Multiple Endocrine Neoplasia Type 1 (MEN1) Gene in a Japanese MEN1 Patient and Her Daughter.

1999 ◽  
Vol 46 (2) ◽  
pp. 325-329 ◽  
Author(s):  
HIDEMI OHYE ◽  
MAKOTO SATO ◽  
SHUJI MATSUBARA ◽  
AKIRA MIYAUCHI ◽  
KEIKO KISHI-IMAI ◽  
...  
Keyword(s):  
Germline Mutation ◽  
Multiple Endocrine Neoplasia ◽  
Multiple Endocrine Neoplasia Type ◽  
Men1 Gene ◽  
Endocrine Neoplasia ◽  
Endocrine Neoplasia Type
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