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Microdeletions including YWHAE in the Miller–Dieker syndrome region on chromosome 17p13.3 result in facial dysmorphisms, growth restriction, and cognitive impairment
  1. S C Sreenath Nagamani1,
  2. F Zhang1,
  3. O A Shchelochkov1,
  4. W Bi1,
  5. Z Ou1,
  6. F Scaglia1,2,
  7. F J Probst1,
  8. M Shinawi1,
  9. C Eng1,
  10. J V Hunter2,3,
  11. S Sparagana4,
  12. E Lagoe5,
  13. C-T Fong5,
  14. M Pearson6,
  15. M Doco-Fenzy7,
  16. E Landais7,
  17. M Mozelle7,
  18. A C Chinault1,
  19. A Patel1,
  20. C A Bacino1,2,
  21. T Sahoo1,
  22. S H Kang1,
  23. S W Cheung1,
  24. J R Lupski1,2,8,
  25. P Stankiewicz1,9
  1. 1
    Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
  2. 2
    Texas Children’s Hospital, Houston, Texas, USA
  3. 3
    Department of Radiology, Baylor College of Medicine, Houston, Texas, USA
  4. 4
    Department of Neurology, Texas Scottish Rite Hospital for Children, Dallas, Texas, USA
  5. 5
    Department of Pediatrics, University of Rochester Medical Center, Rochester, New York, USA
  6. 6
    Neonatology Associates, Ltd, Phoenix, Arizona, USA
  7. 7
    Service de Génétique, HMB, CHRU, UFR de médecine, EA3801, Reims, France
  8. 8
    Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
  9. 9
    Department of Medical Genetics, Institute of Mother and Child, Warsaw, Poland
  1. Correspondence to P Stankiewicz, Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, R809, Houston, TX 77030, USA; pawels{at}bcm.edu

Abstract

Background: Deletions in the 17p13.3 region are associated with abnormal neuronal migration. Point mutations or deletion copy number variants of the PAFAH1B1 gene in this genomic region cause lissencephaly, whereas extended deletions involving both PAFAH1B1 and YWHAE result in Miller–Dieker syndrome characterised by facial dysmorphisms and a more severe grade of lissencephaly. The phenotypic consequences of YWHAE deletion without deletion of PAFAH1B1 have not been studied systematically.

Methods: We performed a detailed clinical and molecular characterization of five patients with deletions involving YWHAE but not PAFAH1B1, two with deletion including PAFAH1B1 but not YWHAE, and one with deletion of YWHAE and mosaic for deletion of PAFAH1B1.

Results: Three deletions were terminal whereas five were interstitial. Patients with deletions including YWHAE but not PAFAH1B1 presented with significant growth restriction, cognitive impairment, shared craniofacial features, and variable structural abnormalities of the brain. Growth restriction was not observed in one patient with deletion of YWHAE and TUSC5, implying that other genes in the region may have a role in regulation of growth with CRK being the most likely candidate. Using array based comparative genomic hybridisation and long range polymerase chain reaction, we have delineated the breakpoints of these nonrecurrent deletions and show that the interstitial genomic rearrangements are likely generated by diverse mechanisms, including the recently described Fork Stalling and Template Switching (FoSTeS)/Microhomology Mediated Break Induced Replication (MMBIR).

Conclusions: Microdeletions of chromosome 17p13.3 involving YWHAE present with growth restriction, craniofacial dysmorphisms, structural abnormalities of brain and cognitive impairment. The interstitial deletions are mediated by diverse molecular mechanisms.

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Footnotes

  • SCSN and FZ contributed equally to this work

  • Funding This work was supported in part by fellowship grant from the Osteogenesis Imperfecta Foundation (SNSC), UCD RDCRN O'Malley Foundation Fellowship (OAS) and by Grant R13-0005-04/2008 from the Polish Ministry of Science and Higher Education (PS).

  • Competing interests None.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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