Smith-Magenis syndrome and Moyamoya disease in a patient with del(17)(p11.2p13.1)

Am J Med Genet A. 2007 May 1;143A(9):999-1008. doi: 10.1002/ajmg.a.31689.


Chromosomal rearrangements causing microdeletions and microduplications are a major cause of congenital malformation and mental retardation. Because they are not visible by routine chromosome analysis, high resolution whole-genome technologies are required for the detection and diagnosis of small chromosomal abnormalities. Recently, array-comparative genomic hybridization (aCGH) and multiplex ligation-dependent probe amplification (MLPA) have been useful tools for the identification and mapping of deletions and duplications at higher resolution and throughput. Smith-Magenis syndrome (SMS) is a multiple congenital anomalies/mental retardation syndrome caused by deletion or mutation of the retinoic acid induced 1 (RAI1) gene and is often associated with a chromosome 17p11.2 deletion. We report here on the clinical and molecular analysis of a 10-year-old girl with SMS and moyamoya disease (occlusion of the circle of Willis). We have employed a combination of aCGH, FISH, and MLPA to characterize an approximately 6.3 Mb deletion spanning chromosome region 17p11.2-p13.1 in this patient, with the proximal breakpoint within the RAI1 gene. Further, investigation of the genomic architecture at the breakpoint intervals of this large deletion documented the presence of palindromic repeat elements that could potentially form recombination substrates leading to unequal crossover.

Publication types

  • Case Reports
  • Research Support, N.I.H., Extramural

MeSH terms

  • Abnormalities, Multiple / genetics*
  • Child
  • Chromosome Deletion*
  • Chromosomes, Human, Pair 17*
  • Female
  • Humans
  • Intellectual Disability / complications
  • Intellectual Disability / genetics*
  • Intracellular Signaling Peptides and Proteins / genetics
  • Moyamoya Disease / complications*
  • Moyamoya Disease / genetics*
  • Nucleic Acid Amplification Techniques
  • Nucleic Acid Hybridization
  • Recombination, Genetic
  • Repressor Proteins
  • Syndrome


  • Intracellular Signaling Peptides and Proteins
  • PPP1R13L protein, human
  • Repressor Proteins