Screening with the FMR1 protein test among mentally retarded males.

Abstract:

:The fragile X syndrome is characterized by X-linked mental retardation with additional features such as a long face with large protruding ears, macroorchidism, and eye-gaze avoidance. The disorder is caused by an abnormally expanded CGG repeat within the first exon of the fragile X mental retardation (FMR1) gene that is associated with shutdown of transcription and absence of the fragile X mental retardation protein (FMRP). Detection of patients and carriers of the fragile X syndrome is done by DNA analysis of the CGG repeat, whereas the FMRP antibody test allows rapid detection of male patients using bloodsmears. In a screening program for the fragile X syndrome in the southwest of the Netherlands, 412 males with mental retardation of unknown cause were subjected to the protein test. The patients were scored for fragile X features and their DNA tested for the FMR1 mutation, as reported previously. The FMRP test detected two fragile X patients with a repeat expansion in FMR1, whereas normal protein expression was observed in all the retarded male patients with a normal repeat. The FMRP test was found to be suitable for screening among a large population of retarded males. The results also suggest that mutations other than the CGG repeat leading to absence of detectable FMRP are apparently rare among mentally retarded males.

journal_name

Hum Genet

journal_title

Human genetics

authors

de Vries BB,Mohkamsing S,van den Ouweland AM,Halley DJ,Niermeijer MF,Oostra BA,Willemsen R

doi

10.1007/s004390050860

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

520-2

issue

4

eissn

0340-6717

issn

1432-1203

journal_volume

103

pub_type

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