Single-strand conformation polymorphism analysis in the FMR1 gene

S. Castellví-Bel, A. Sánchez, C. Badenas, J. Mallolas, A. Barceló, D. Jiménez, M. Villa, Xavier P. Estivill, M. Milà

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The fragile X syndrome is due to an expansion of the CGG trinucleotide repeat in the FMR1 gene and hypermethylation of its 5' upstream CpG island in about 95% of the cases. The remaining 5% of cases correspond to other molecular alterations in FMR1 gene such as partial or complete deletions, or point mutations within the coding sequence. We selected 31 patients with clinical manifestations of fragile X syndrome, scoring 16 or more in Hagerman's checklist, but without the CGG expansion. We performed single- strand conformation polymorphism analysis using a nonradioactive technique (silver staining) and we detected six anomalous migrations that, by sequence analysis, corresponded to six nucleotide changes. We screened two different populations (control and fragile X) for these changes, and concluded that they correspond to five new polymorphisms within the FMR1 gene and to one possible synonymous mutation.

Original languageEnglish
Pages (from-to)262-265
Number of pages4
JournalAmerican Journal of Medical Genetics
Issue number3
Publication statusPublished - 28 May 1999
Externally publishedYes



  • FMR1 gene
  • Fragile X syndrome
  • Mental retardation
  • SSCP analysis

ASJC Scopus subject areas

  • Genetics(clinical)

Cite this

Castellví-Bel, S., Sánchez, A., Badenas, C., Mallolas, J., Barceló, A., Jiménez, D., Villa, M., Estivill, X. P., & Milà, M. (1999). Single-strand conformation polymorphism analysis in the FMR1 gene. American Journal of Medical Genetics, 84(3), 262-265.<262::AID-AJMG18>3.0.CO;2-V