Functional characterization of a heterozygous GLI2 missense mutation in patients with multiple pituitary hormone deficiency

G. M C Flemming, J. Klammt, G. Ambler, Yong Bao, W. F. Blum, C. Cowell, K. Donaghue, N. Howard, A. Kumar, Janine E Sanchez, H. Stobbe, R. W. Pfäffle

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Context: The GLI2 transcription factor is a major effector protein of the sonic hedgehog pathway and suggested to play a key role in pituitary development. Genomic GLI2 aberrations that mainly result in truncated proteins havebeenreported to cause holoprosencephaly or holoprosencephaly-like features, sometimes associated with hypopituitarism. Objective: Our objective was to determine the frequency of GLI2 mutations in patients with multiple pituitary hormone deficiency (MPHD). Design: Patients were selected from participants in the Genetics and Neuroendocrinology of Short Stature International Study (GeNeSIS) program. Patients with mutations within established candidate genes were excluded. Patients: A total of 165 patients with MPHD defined as GH deficiency and at least 1 additional pituitary hormone deficiency were studied regardless of the presence of extrapituitary clinical manifestations. Main Outcome Measures: Prevalence of GLI2 variations in MPHD patients was assessed and detailed phenotypic characterization is given. Transcriptional activity of identified GLI2 variants was evaluated by functional reporter assays. Results: In 5 subjects, 4 heterozygous missense variants were identified, of which 2 are unpublished so far. One variant, p.R516P, results in vitro in a complete loss of protein function. In addition to GHdeficiency, the carrier of the mutation demonstrates deficiency of thyrotrope and gonadotrope function, a maldescended posterior pituitary lobe, and polydactyly, but no midline defects. Conclusions: For the first time, we show that heterozygous amino acid substitutions within GLI2 may lead to MPHD with mild extrapituitary findings. The phenotype of GLI2 mutations is variable, and penetrance is incomplete. GLI2 mutations are associated with anterior pituitary hypoplasia, and frequently, ectopy of the posterior lobe occurs.

Original languageEnglish
JournalJournal of Clinical Endocrinology and Metabolism
Volume98
Issue number3
DOIs
StatePublished - Mar 1 2013

Fingerprint

Pituitary Hormones
Missense Mutation
Holoprosencephaly
Mutation
Hedgehog Proteins
Neuroendocrinology
Polydactyly
Posterior Pituitary Gland
Hypopituitarism
Aberrations
Penetrance
Mutation Rate
Amino Acid Substitution
Assays
Proteins
Substitution reactions
Transcription Factors
Genes
Amino Acids
Defects

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Endocrinology
  • Biochemistry, medical
  • Endocrinology, Diabetes and Metabolism

Cite this

Functional characterization of a heterozygous GLI2 missense mutation in patients with multiple pituitary hormone deficiency. / Flemming, G. M C; Klammt, J.; Ambler, G.; Bao, Yong; Blum, W. F.; Cowell, C.; Donaghue, K.; Howard, N.; Kumar, A.; Sanchez, Janine E; Stobbe, H.; Pfäffle, R. W.

In: Journal of Clinical Endocrinology and Metabolism, Vol. 98, No. 3, 01.03.2013.

Research output: Contribution to journalArticle

Flemming, G. M C ; Klammt, J. ; Ambler, G. ; Bao, Yong ; Blum, W. F. ; Cowell, C. ; Donaghue, K. ; Howard, N. ; Kumar, A. ; Sanchez, Janine E ; Stobbe, H. ; Pfäffle, R. W. / Functional characterization of a heterozygous GLI2 missense mutation in patients with multiple pituitary hormone deficiency. In: Journal of Clinical Endocrinology and Metabolism. 2013 ; Vol. 98, No. 3.
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AU - Flemming, G. M C

AU - Klammt, J.

AU - Ambler, G.

AU - Bao, Yong

AU - Blum, W. F.

AU - Cowell, C.

AU - Donaghue, K.

AU - Howard, N.

AU - Kumar, A.

AU - Sanchez, Janine E

AU - Stobbe, H.

AU - Pfäffle, R. W.

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N2 - Context: The GLI2 transcription factor is a major effector protein of the sonic hedgehog pathway and suggested to play a key role in pituitary development. Genomic GLI2 aberrations that mainly result in truncated proteins havebeenreported to cause holoprosencephaly or holoprosencephaly-like features, sometimes associated with hypopituitarism. Objective: Our objective was to determine the frequency of GLI2 mutations in patients with multiple pituitary hormone deficiency (MPHD). Design: Patients were selected from participants in the Genetics and Neuroendocrinology of Short Stature International Study (GeNeSIS) program. Patients with mutations within established candidate genes were excluded. Patients: A total of 165 patients with MPHD defined as GH deficiency and at least 1 additional pituitary hormone deficiency were studied regardless of the presence of extrapituitary clinical manifestations. Main Outcome Measures: Prevalence of GLI2 variations in MPHD patients was assessed and detailed phenotypic characterization is given. Transcriptional activity of identified GLI2 variants was evaluated by functional reporter assays. Results: In 5 subjects, 4 heterozygous missense variants were identified, of which 2 are unpublished so far. One variant, p.R516P, results in vitro in a complete loss of protein function. In addition to GHdeficiency, the carrier of the mutation demonstrates deficiency of thyrotrope and gonadotrope function, a maldescended posterior pituitary lobe, and polydactyly, but no midline defects. Conclusions: For the first time, we show that heterozygous amino acid substitutions within GLI2 may lead to MPHD with mild extrapituitary findings. The phenotype of GLI2 mutations is variable, and penetrance is incomplete. GLI2 mutations are associated with anterior pituitary hypoplasia, and frequently, ectopy of the posterior lobe occurs.

AB - Context: The GLI2 transcription factor is a major effector protein of the sonic hedgehog pathway and suggested to play a key role in pituitary development. Genomic GLI2 aberrations that mainly result in truncated proteins havebeenreported to cause holoprosencephaly or holoprosencephaly-like features, sometimes associated with hypopituitarism. Objective: Our objective was to determine the frequency of GLI2 mutations in patients with multiple pituitary hormone deficiency (MPHD). Design: Patients were selected from participants in the Genetics and Neuroendocrinology of Short Stature International Study (GeNeSIS) program. Patients with mutations within established candidate genes were excluded. Patients: A total of 165 patients with MPHD defined as GH deficiency and at least 1 additional pituitary hormone deficiency were studied regardless of the presence of extrapituitary clinical manifestations. Main Outcome Measures: Prevalence of GLI2 variations in MPHD patients was assessed and detailed phenotypic characterization is given. Transcriptional activity of identified GLI2 variants was evaluated by functional reporter assays. Results: In 5 subjects, 4 heterozygous missense variants were identified, of which 2 are unpublished so far. One variant, p.R516P, results in vitro in a complete loss of protein function. In addition to GHdeficiency, the carrier of the mutation demonstrates deficiency of thyrotrope and gonadotrope function, a maldescended posterior pituitary lobe, and polydactyly, but no midline defects. Conclusions: For the first time, we show that heterozygous amino acid substitutions within GLI2 may lead to MPHD with mild extrapituitary findings. The phenotype of GLI2 mutations is variable, and penetrance is incomplete. GLI2 mutations are associated with anterior pituitary hypoplasia, and frequently, ectopy of the posterior lobe occurs.

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