A majority of fragile X males with methylated, full mutation alleles have significant levels of FMR1 messenger RNA

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Abstract

FMR1 mRNA levels were determined in peripheral blood leucocytes for 48 fragile X males with methylated, full mutation alleles that are resistant to cleavage by methylation sensitive enzymes. Using quantitative (fluorescence) RT-PCR, we observed that more than half of these males produce FMR1 mRNA, with some mRNA levels approaching those found in normal subjects. In none of the samples analysed was there any evidence of premutation alleles. These results suggest that the assumed relationship between enzyme resistance and FMR1 gene silencing may not be generally valid. Despite the presence of FMR1 mRNA in some subjects, no FMRP production was detected by either immunocytochemistry or western blotting. The low/absent FMRP levels are probably a reflection of a post-transcriptional effect such as a defect in translation.

Original languageEnglish (US)
Pages (from-to)453-456
Number of pages4
JournalJournal of Medical Genetics
Volume38
Issue number7
StatePublished - 2001

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Alleles
Messenger RNA
Mutation
Gene Silencing
Enzymes
Methylation
Leukocytes
Fluorescence
Western Blotting
Immunohistochemistry
Polymerase Chain Reaction

Keywords

  • Gene silencing
  • Neurodevelopment
  • Quantitative RT-PCR
  • Trinucleotide repeat

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

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title = "A majority of fragile X males with methylated, full mutation alleles have significant levels of FMR1 messenger RNA",
abstract = "FMR1 mRNA levels were determined in peripheral blood leucocytes for 48 fragile X males with methylated, full mutation alleles that are resistant to cleavage by methylation sensitive enzymes. Using quantitative (fluorescence) RT-PCR, we observed that more than half of these males produce FMR1 mRNA, with some mRNA levels approaching those found in normal subjects. In none of the samples analysed was there any evidence of premutation alleles. These results suggest that the assumed relationship between enzyme resistance and FMR1 gene silencing may not be generally valid. Despite the presence of FMR1 mRNA in some subjects, no FMRP production was detected by either immunocytochemistry or western blotting. The low/absent FMRP levels are probably a reflection of a post-transcriptional effect such as a defect in translation.",
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T1 - A majority of fragile X males with methylated, full mutation alleles have significant levels of FMR1 messenger RNA

AU - Tassone, Flora

AU - Hagerman, Randi J

AU - Taylor, A. K.

AU - Hagerman, Paul J

PY - 2001

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AB - FMR1 mRNA levels were determined in peripheral blood leucocytes for 48 fragile X males with methylated, full mutation alleles that are resistant to cleavage by methylation sensitive enzymes. Using quantitative (fluorescence) RT-PCR, we observed that more than half of these males produce FMR1 mRNA, with some mRNA levels approaching those found in normal subjects. In none of the samples analysed was there any evidence of premutation alleles. These results suggest that the assumed relationship between enzyme resistance and FMR1 gene silencing may not be generally valid. Despite the presence of FMR1 mRNA in some subjects, no FMRP production was detected by either immunocytochemistry or western blotting. The low/absent FMRP levels are probably a reflection of a post-transcriptional effect such as a defect in translation.

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KW - Trinucleotide repeat

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