A novel C-terminal nonsense mutation, Q315X, of the aryl hydrocarbon receptor-interacting protein gene in a Japanese familial isolated pituitary adenoma family.
Although the cause of familial isolated pituitary adenoma (FIPA) remains unknown in many cases, germline mutations in the aryl hydrocarbon receptor-interacting protein (AIP) gene were identified in approximately 20 % of families with FIPA. We investigated the AIP gene mutation by a standard sequencing method in 12 members of a Japanese two-generation FIPA family, which includes 3 patients with early-onset acromegaly. Multiplex ligation-dependent probe amplification analysis in a tumor sample was attempted to examine the loss of heterozygosity (LOH) in the locus. The effect of the detected mutation on cell proliferation was investigated. A germline mutation of c.943C > T (p.Q315X) generating an AIP protein with the C-terminal end deleted was found in the FIPA family. Biallelic inactivation of AIP by a combination of the germline mutation and LOH at 11q13 was confirmed in the tumor. The nonsense mutation disrupted the ability to inhibit cell proliferation. We conclude that p.Q315X mutation in the AIP gene is a pathogenic variant and the C-terminal region of AIP plays an important role in the predisposition to pituitary adenomas.
Department of Medical Pharmacology, Institute of Health Biosciences, The University of Tokushima Graduate School, Kuramoto-cho 3-18-15, Tokushima City, 770-8504, Japan.
Takeo
T
Iwata
Shozo
S
Yamada
Junko
J
Ito
Naoko
N
Inoshita
Noriko
N
Mizusawa
Shinji
S
Ono
Katsuhiko
K
Yoshimoto
D000236:Adenoma / Q000235:genetics* / Q000378:metabolism; D000293:Adolescent; D000328:Adult; D018389:Codon, Nonsense; D004252:DNA Mutational Analysis; D005260:Female; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics*; D007564:Japan; D008297:Male; D010375:Pedigree; D010911:Pituitary Neoplasms / Q000235:genetics* / Q000473:pathology
D018389:Codon, Nonsense; D047908:Intracellular Signaling Peptides and Proteins; C103265:aryl hydrocarbon receptor-interacting protein