Loss-of-function mutations in the human GLI2 gene are associated with pituitary anomalies and holoprosencephaly-like features.
Diminished Sonic Hedgehog (Shh) signaling is associated with the most common forebrain defect in humans, holoprosencephaly (HPE), which includes cyclopia, a phenotype also seen in mice and other vertebrates with defective Shh signaling. The secreted protein Shh acts as a crucial factor that patterns the ventral forebrain and is required for the division of the primordial eye field and brain into two discrete halves. Gli2 is one of three vertebrate transcription factors implicated as obligatory mediators of Shh signal transduction. Here, we show that loss-of-function mutations in the human GLI2 gene are associated with a distinctive phenotype (within the HPE spectrum) whose primary features include defective anterior pituitary formation and pan-hypopituitarism, with or without overt forebrain cleavage abnormalities, and HPE-like midfacial hypoplasia. We also demonstrate that these mutations lack GLI2 activity. We report on a functional association between GLI2 and human disease and highlight the role of GLI2 in human head development.
Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892-1852, USA.
Erich
E
Roessler
Yang-Zhu
YZ
Du
Jose L
JL
Mullor
Esther
E
Casas
William P
WP
Allen
Gabriele
G
Gillessen-Kaesbach
Elizabeth R
ER
Roeder
Jeffrey E
JE
Ming
Ariel
A
Ruiz i Altaba
Maximilian
M
Muenke
D000483:Alleles; D000818:Animals; D019556:COS Cells; D004252:DNA Mutational Analysis; D018076:DNA, Complementary / Q000378:metabolism; D019066:Facies; D016142:Holoprosencephaly / Q000235:genetics*; D006801:Humans; D051741:Kruppel-Like Transcription Factors; D051379:Mice; D008809:Mice, Inbred C3H; D008957:Models, Genetic; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D009687:Nuclear Proteins; D010641:Phenotype; D010802:Phylogeny; D010902:Pituitary Gland / Q000002:abnormalities*; D016548:Prosencephalon / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012878:Skin Neoplasms / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D014162:Transfection; D014981:Xenopus; D000075746:Zinc Finger Protein Gli2
D018076:DNA, Complementary; C082593:GLI2 protein, human; C000618551:Gli2 protein, mouse; D051741:Kruppel-Like Transcription Factors; D009687:Nuclear Proteins; D012333:RNA, Messenger; D014157:Transcription Factors; D000075746:Zinc Finger Protein Gli2