Genotype prediction in the fragile X syndrome

M. C. Hirst, Y. Nakahori, S. J.L. Knight, C. Schwartz, S. N. Thibodeau, A. Roche, T. J. Flint, J. M. Connor, J. P. Fryns, K. E. Davies

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Fragile X positive, mentally retarded males have been shown to have an insertion or amplification of DNA sequences at, or close to, the site of expression of the fragile site. We show here the application of the detection of such changes to the diagnosis of affected males and female carriers and the identification of normal transmitting males. One fragile X negative male with the clinical features of the Martin-Bell syndrome also possesses an inserted/amplified DNA sequence. The implications of these results for screening for the fragile X syndrome are discussed.

Original languageEnglish (US)
Pages (from-to)824-829
Number of pages6
JournalJournal of medical genetics
Issue number12
StatePublished - 1991

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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