Identification of eleven novel tumor-associated E-cadherin mutations. Mutations in brief no. 215. Online.
The cell adhesion molecule E-cadherin (CDH1; MIM# 192090) has been implicated in numerous cellular functions, ranging from controlling morphogenesis to suppressing tumor invasion. We describe 11 previously unreported somatic E-cadherin mutations in two subgroups of gastric and breast cancer showing markedly reduced homophilic cell-to-cell interactions. Using reverse transcription-polymerase chain reaction (RT-PCR) and direct sequencing of the entire coding region 5 mutations were detected in diffuse-type gastric cancer specimens. The sequence alterations include 3 missense mutations affecting exons 3, 10, and 12. Furthermore, two in-frame deletions were identified removing 63 and 9 base pairs from exon 4 and 5, respectively. In invasive Lobular breast cancer 6 E-cadherin mutations were detected after RT-PCR amplification and direct sequencing or using single strand conformation polymorphism (SSCP) analysis followed by sequencing. In addition to two nonsense mutations affecting exon 2, four out-of-frame deletions removing 115 base pairs (entire exon 2), 224 base pairs (entire exon 3), 8 base pairs from exon 12 or 1 base pair from exon 13 were seen. Our report confirms the general principle that in diffuse-type gastric cancer E-cadherin mutations result in structurally altered proteins with possible reduced adhesive functions whereas in invasive lobular breast carcinomas complete loss-of-function mutations are characteristic.
Becker
K F
KF
Technische Universität, Klinikum rechts der Isar, Institut für Pathologie, München, Germany.
Reich
U
U
Schott
C
C
Becker
I
I
Berx
G
G
van Roy
F
F
Höfler
H
H
D001943:Breast Neoplasms / Q000235:genetics*; D015820:Cadherins / Q000235:genetics*; D006801:Humans; D009154:Mutation / Q000235:genetics*; D018807:Polymorphism, Single-Stranded Conformational; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000235:genetics*
D015820:Cadherins