De Novo Large Deletion Leading to Fragile X Syndrome

Poonnada Jiraanont, Esther Manor, Nazi Tabatadze, Marwa Zafarullah, Guadalupe Mendoza, Gia Melikishvili, Flora Tassone

Research output: Contribution to journalArticlepeer-review


Fragile X syndrome (FXS) is the most frequent cause of X-linked inherited intellectual disabilities (ID) and the most frequent monogenic form of autism spectrum disorders. It is caused by an expansion of a CGG trinucleotide repeat located in the 5′UTR of the FMR1 gene, resulting in the absence of the fragile X mental retardation protein, FMRP. Other mechanisms such as deletions or point mutations of the FMR1 gene have been described and account for approximately 1% of individuals with FXS. Here, we report a 7-year-old boy with FXS with a de novo deletion of approximately 1.1 Mb encompassing several genes, including the FMR1 and the ASFMR1 genes, and several miRNAs, whose lack of function could result in the observed proband phenotypes. In addition, we also demonstrate that FMR4 completely overlaps with ASFMR1, and there are no sequencing differences between both transcripts (i.e., ASFMR1/FMR4 throughout the article).

Original languageEnglish
Article number884424
JournalFrontiers in Genetics
StatePublished - 11 May 2022


  • ASFMR1/FMR4 gene
  • FMR1 gene
  • fragile X syndrome
  • large deletion
  • miRNA

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Genetics(clinical)


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