A novel MEN1 frameshift germline mutation in two Italian monozygotic twins.
BACKGROUND
This report describes clinical, biochemical and molecular findings regarding two Italian monozygotic twins carrying a novel multiple endocrine neoplasia type 1 (MEN1) mutation inherited from their mother.


METHODS
Clinical, biochemical and genetic evaluations of the above-mentioned family members were performed.


RESULTS
All three members were heterozygous for a deletion involving the first nucleotide at codon 98 in exon 2 of the MEN1 gene, which results in early termination of the protein. The clinical phenotypes were as follows: one out of the two twins suffered from insulinoma and hyperparathyroidism, while the second one was asymptomatic. Furthermore, the mother suffered from hyperparathyroidism, as well as from hypergastrinemia for several years before the daughter was diagnosed of MEN-1.


CONCLUSIONS
We describe a family with a new heterozygous mutation (g.292delC) in the MEN1 gene not described previously. The mutation leads to a truncated protein without activity, explaining the clinical picture of this family.
Concolino
Paola
P
Laboratory of Molecular Biology, Institute of Biochemistry and Clinical Biochemistry, Catholic University, Rome, Italy.
Rossodivita
Aurora
A
Carrozza
Cinzia
C
Raffaelli
Marco
M
Lombardi
Celestino Pio
CP
Rigante
Donato
D
Pitocco
Dario
D
Stabile
Achille
A
Bellantone
Rocco
R
Zuppi
Cecilia
C
Capoluongo
Ettore
E
D000293:Adolescent; D004200:Diseases in Twins / Q000235:genetics*; D005190:Family; D005260:Female; D016368:Frameshift Mutation; D018095:Germ-Line Mutation; D006801:Humans; D049950:Hyperparathyroidism, Primary / Q000175:diagnosis / Q000235:genetics / Q000378:metabolism; D007340:Insulinoma / Q000175:diagnosis / Q000235:genetics / Q000378:metabolism; D018761:Multiple Endocrine Neoplasia Type 1 / Q000235:genetics* / Q000378:metabolism; D010190:Pancreatic Neoplasms / Q000175:diagnosis / Q000235:genetics / Q000378:metabolism; D014430:Twins, Monozygotic