Pure 6p22-pter trisomic patient: Refined FISH characterization and genotype-phenotype correlation

D. Giardino, P. Finelli, D. Caufin, G. Gottardi, R. Lo Vasco, L. Turolla, L. Larizza

Research output: Contribution to journalArticlepeer-review


First described in 1971, partial trisomy 6p is uncommon and generally secondary to a familial reciprocal translocation. The proximal breakpoint of the reported cases varies from p11 to p25. We here report on a patient with moderate mental retardation, craniofacial and pigmentary anomalies, proteinuria, and hyperglycemia who was found to have a mosaic karyotype 46,X,add (Y)(q12)/45,X. Fluorescence in situ hybridization (FISH) enabled us to identify that the additional material on Yqh derived from 6p and to define the rearrangement as der(Y)t(Y;6)(q12;p22). To the best of our knowledge, this is the first case of trisomy 6p22-pter without an associated deleted segment; the second breakpoint of the rearrangement is in Yqh. Precise mapping of the centromeric breakpoint of the trisomic 6p segment allowed a more convincing correlation between partial 6p trisomy and clinical phenotype to be addressed. In particular, the proteinuria often observed in 6p trisomic patients could be assigned to the 6p22-6pter region.

Original languageEnglish
Pages (from-to)36-40
Number of pages5
JournalAmerican Journal of Medical Genetics
Issue number1
Publication statusPublished - Feb 15 2002


  • Breakpoint FISH mapping
  • Congenital anomalies
  • Der(Y)
  • Partial trisomy 6p
  • Proteinuria

ASJC Scopus subject areas

  • Genetics(clinical)


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