Screening of subtelomeric rearrangements in autistic disorder: Identification of a partial trisomy of 13q34 in a patient bearing a 13q;21p translocation

Maria Antonietta Di Bella, Francesco Calì, Gregorio Seidita, Mario Mirisola, Angela Ragusa, Alda Ragalmuto, Ornella Galesi, Maurizio Elia, Donatella Greco, Marinella Zingale, Giovanna Gambino, Rosalba P. D'Anna, Regina Regan, Maria Carmela Carbone, Alessia Gallo, Valentino Romano

Research output: Contribution to journalArticle

Abstract

Within the framework of a FISH screening protocol to detect cryptic subtelomeric rearrangements in autistic disorder (AD), a patient bearing three copies of the subtelomeric portion of the q arm of chromosome 13 has been identified. Beside AD, the patient also has severe mental retardation and displays several dysmorphic features. Further FISH analyses revealed that the trisomy was caused by the translocation of a 13q subtelomeric fragment to the acrocentric tip of one chromosome 21 [46,XY.ish der(21) t(13;21) (q34;p13) (D13S1825+)]. Gene dosage experiments carried out with three multiallelic polymorphisms of the subtelomeric region of chromosome 13q showed that the putative length of the triplicate region does not exceed 300 kb about, that is, the distance from telomere to the first normally inherited marker. In addition, gene dosage analysis performed on the derivative chromosome 21, did not reveal loss of the most telomeric protein-encoding genes on 21p. The potential relationship between a postulated increased expression of genes on 13q34 and the complex phenotype in this trisomie patient is discussed.

Original languageEnglish
Pages (from-to)584-590
Number of pages7
JournalAmerican Journal of Medical Genetics - Neuropsychiatric Genetics
Volume141
Issue number6
DOIs
Publication statusPublished - Sep 5 2006

Keywords

  • Autism
  • Frontal bossing
  • Gene dosage

ASJC Scopus subject areas

  • Genetics(clinical)
  • Neuropsychology and Physiological Psychology
  • Neuroscience(all)

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