Genetic testing for multiple endocrine neoplasia type 2.
Multiple endocrine neoplasia type 2 (MEN 2) represents a complex autosomal dominant inherited syndrome characterized by occurrence of distinct proliferative disorders of endocrine tissues. The identification of RET proto-oncogene mutations in MEN 2 and FMCT has provided a precise method for identifying gene carriers. 30 subjects (9 males, 21 females, age range 11-63 years) with multiple endocrine neoplasia type 2 have been investigated from 1998 till 2006. 20 patients were considered as index cases and 10 patients were identified after a screening programme for MEN 2. Tumoral associations permitted the MEN 2A diagnosis in 21 cases, MEN 2A with cutaneous lichen amyloidosis in 6 cases and FMCT in 3 cases. We selected 22 patients from 14 families to investigate mutations in the RET proto-oncogene. In 7 subjects no mutations could be detected in the exons 10 and 11 of the RET proto-oncogene. Heterozygous missense mutations in exon 11 were found in 15 subjects consisting of three different mutations in codon 634 (TGC --> TGG, TGC --> GGC, TGC --> CGC). We conclude that our 15 patients have the most frequent mutations described in MEN 2A families. Because the testing for exons 10 and 11 is negative for other 7 patients, the remaining 13, 14, 15 and 16 exons should be sequenced in these cases.
Păun
Diana Loreta
DL
C.I. Parhon National Institute of Endocrinology , Bucharest, Romania. dsp@mailbox.ro
Mohora
Maria
M
Duţă
Carmen
C
Dumitrache
C
C
D000293:Adolescent; D000328:Adult; D002648:Child; D003062:Codon / Q000235:genetics; D015331:Cohort Studies; D004252:DNA Mutational Analysis; D005260:Female; D006580:Genetic Carrier Screening; D005820:Genetic Testing; D006801:Humans; D008297:Male; D008875:Middle Aged; D018813:Multiple Endocrine Neoplasia Type 2a / Q000175:diagnosis* / Q000235:genetics* / Q000473:pathology; D020125:Mutation, Missense / Q000235:genetics*; D016133:Polymerase Chain Reaction; D000090063:Proto-Oncogene Mas; D051096:Proto-Oncogene Proteins c-ret / Q000235:genetics*; D015203:Reproducibility of Results; D012189:Retrospective Studies; D055815:Young Adult
D003062:Codon; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D051096:Proto-Oncogene Proteins c-ret; C099282:RET protein, human