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© Christelle Durand
Microscopie d'un neurone. Le marquage jaune montre les synapses.
Publication : Prenatal diagnosis

Prenatal diagnosis of fragile X syndrome: Small meiotic recombination events at the FMR1 locus.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Prenatal diagnosis - 01 Apr 2019

Bacrot S, Monnot S, Haddad G, Barcia G, Rachid M, Boisson M, Pasquier N, Rondeau S, Munnich A, Steffann J, Bonnefont JP, Raynaud M,

Link to Pubmed [PMID] – 30779209

Link to DOI – 10.1002/pd.5439

Prenat Diagn 2019 04; 39(5): 388-393

Fragile X syndrome (FXS), the most commonly inherited cause of intellectual disability, is caused by an expansion over 200 CGG repeats (full mutation) in the FMR1 gene. Intergenerational instability of an expanded FMR1 allele is linked to the carrier’s gender (female), the CGG repeat size, and the number of AGG interspersions within the CGG repeat, making genetic counseling a complex task. The objective of our work was to emphasize the importance of combining haplotype analysis with FMR1-linked markers and CGG repeat sizing for prenatal diagnosis (PND) of FXS.Two PNDs of FXS were performed using haplotype analysis and sizing of the FMR1 allele.We detected two cases of meiotic recombination at the FMR1 locus, ie, reciprocal double crossover or non-crossover, resulting in coexistence of the mutant maternal haplotype and the normal-sized maternal CGG repeat.These rare and unexpected cases (1/120 frequency in our experience) have to be kept in mind in PND of FXS since they prohibit using polymorphic marker haplotyping as the only tool to predict the fetus status.

https://pubmed.ncbi.nlm.nih.gov/30779209