A Patient With a Mild Holoprosencephaly Spectrum Phenotype and Heterotaxy and a 1.3 Mb Deletion Encompassing GLI2

Sietske H. G. Kevelam*, Jeske J. T. van Harssel, Bert van der Zwaag, Hubertus J. M. Smeets, Aimee D. C. Paulussen, Klaske D. Lichtenbelt

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Web of Science)

Abstract

Loss-of-function mutations of GLI2 are associated with features at the mild end of the holoprosencephaly spectrum, including abnormal pituitary gland formation and/or function, and craniofacial abnormalities. In addition patientsmay have branchial arch anomalies and polydactyly. Large, microscopically visible, interstitial deletions spanning 2q14.2 have been reported in patients with multiple congenital anomalies and intellectual disability. We report here on a patient with a mild holoprosencephaly spectrum phenotype (bilateral cleft lip and palate and abnormal pituitary gland formation with panhypopituitarism) and normal psychomotor development, who was found to carry a 1.3Mb submicroscopic heterozygous deletion in 2q14.2, encompassing theGLI2 gene. Wereview the genotype and phenotype of previously published probands with GLI2 aberrations. Our findings confirm the association of haploinsufficiency of GLI2 and mild HPE spectrum features. Consistent with prior reports, we observed incomplete penetrance of the deletion in the family, illustrating the multifactorial etiology of holoprosencephaly spectrum features. In addition to the holoprosencephaly spectrum features, the proband had heterotaxy of the abdominal organs. Mutations in the known heterotaxy genes (NODAL, ZIC3 and CFC1) were excluded. The deletion contains five genes, in addition to GLI2, including the EPB4.1l5 gene. Based on findings in Epb4.1l5 mutant mice we hypothesize that Epb4.1l5 is a candidate gene for the heterotaxy observed in the proband.
Original languageEnglish
Pages (from-to)166-173
JournalAmerican Journal of Medical Genetics Part A
Volume158A
Issue number1
DOIs
Publication statusPublished - Jan 2012

Keywords

  • GLI2
  • array comparative genomic hybridization
  • deletion
  • holoprosencephaly
  • heterotaxy

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