Recombinant chromosome 7 driven by maternal chromosome 7 pericentric inversion in a girl with features of silver-Russell syndrome

Ilaria Catusi, Maria Teresa Bonati, Ester Mainini, Silvia Russo, Eleonora Orlandini, Lidia Larizza, Maria Paola Recalcati

Research output: Contribution to journalArticlepeer-review

Abstract

Maternal uniparental disomy of chromosome 7 is present in 5–10% of patients with Silver-Russell syndrome (SRS), and duplication of 7p including GRB10 (Growth Factor Receptor-Bound Protein 10), an imprinted gene that affects pre-and postnatal growth retardation, has been associated with the SRS phenotype. Here, we report on a 17 year old girl referred to array-CGH analysis for short stature, psychomotor delay, and relative macrocephaly. Array-CGH analysis showed two copy number variants (CNVs): a ~12.7 Mb gain in 7p13-p11.2, involving GRB10 and an ~9 Mb loss in 7q11.21-q11.23. FISH experiments performed on the proband’s mother showed a chromosome 7 pericentric inversion that might have mediated the complex rearrangement harbored by the daughter. Indeed, we found that segmental duplications, of which chromosome 7 is highly enriched, mapped at the breakpoints of both the mother’s inversion and the daughter’s CNVs. We postulate that pairing of highly homologous sequences might have perturbed the correct meiotic chromosome segregation, leading to unbalanced outcomes and acting as the putative meiotic mechanism that was causative of the proband’s rearrangement. Comparison of the girl’s phenotype to those of patients with similar CNVs supports the presence of 7p in a locus associated with features of SRS syndrome.

Original languageEnglish
Article number8487
Pages (from-to)1-11
Number of pages11
JournalInternational Journal of Molecular Sciences
Volume21
Issue number22
DOIs
Publication statusPublished - Nov 2 2020

Keywords

  • Array-CGH
  • AUTS2 gene
  • Chromosome 7 pericentric inversion
  • Chromosome 7p duplication
  • GRB10 gene
  • Recombinant chromosome
  • Silver-Russell syndrome

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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