PTEN mutations in eight Spanish families and one Brazilian family with Cowden syndrome.
Cowden syndrome is an autosomal dominant genodermatosis, characterized by the presence of multiple hamartomas in the skin, breast, thyroid, gastrointestinal tract, central nervous system, and an increased risk in developing breast and thyroid carcinomas. Over 80 germline mutations of the tumor suppressor gene PTEN, on chromosome 10q23, have been reported in more than 100 unrelated patients and families; however, questions regarding distribution of the mutations in populations from different geographic areas, and phenotypic expression are still unclear. In this study the results are reported of mutation analysis of PTEN in 13 families from Spain and one family of Brazilian origin with Cowden syndrome. PTEN germline mutations were detected in nine of them (64%). Five mutations were located in exon 5, one in exon 6, two in exon 7, and one in exon 8. Four of the mutations were novel. In another case, an identical change had been previously reported as a somatic mutation in an endometrial carcinoma. In one family, the patient presented a de novo mutation, which was not detected in his parents. In five patients, the detection of the PTEN germline mutation confirmed their condition, even in the absence of sufficient criteria to make the clinical diagnosis of Cowden syndrome.
Bussaglia
Elena
E
Department of Pathology, Hospital Santa Creu i Sant Pau, Barcelona, Spain.
Pujol
Ramon M
RM
Gil
M Jesus
MJ
Martí
Rosa M
RM
Tuneu
Anna
A
Febrer
Maria Isabel
MI
Garcia-Patos
Vicenç
V
Ruiz
Esperanza Martinez
EM
Barnadas
Maria
M
Alegre
Marta
M
Serrano
Sol
S
Matias-Guiu
Xavier
X
D000293:Adolescent; D000328:Adult; D000368:Aged; D001938:Brazil; D002648:Child; D002675:Child, Preschool; D005091:Exons; D005192:Family Health; D005260:Female; D018095:Germ-Line Mutation; D006223:Hamartoma Syndrome, Multiple / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D051059:PTEN Phosphohydrolase; D010375:Pedigree; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics*; D013030:Spain; D025521:Tumor Suppressor Proteins / Q000235:genetics*
D025521:Tumor Suppressor Proteins; D010744:Phosphoric Monoester Hydrolases; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human