CONTEXT: Holoprosencephaly (HPE) is a developmental defect characterized by wide phenotypic variability, ranging from minor midline malformations (eg, single central incisor) to severe deformities. In 10-15% of HPE patients, mutations in specific genes have been identified (eg, SHH, TGIF, SIX3). Pituitary stalk interruption syndrome (PSIS) constitutes a distinct abnormality of unknown pathogenesis, whereas isolated pituitary hypoplasia (IPH) has been linked to various developmental genes. OBJECTIVE: Three of our patients with PSIS had a single central incisor, a malformation encountered in some HPE cases. Based on this observation, we initiated a search for mutations in HPE-associated genes in 30 patients with PSIS or IPH. DESIGN AND PARTICIPANTS: The entire coding region of the TGIF, SHH, and SIX3 genes was sequenced in patients with combined pituitary hormone deficiency associated with either PSIS or IPH and in healthy controls. RESULTS: Two novel mutations in the HPE-related genes were detected (ie, c.799 C>T, p.Q267X in the TGIF gene, and c.1279G>A, p.G427R in the SHH gene) in 2 of our patients. The overall incidence of HPE-related gene mutations in our nonsyndromic and nonchromosomal patients was 6.6%. No molecular defect in the SIX3 gene was detected in our cohort. CONCLUSIONS: The data suggest that HPE-related gene mutations are implicated in the etiology of isolated pituitary defects (PSIS or IPH). Alternatively, PSIS or IPH may constitute mild forms of an expanded HPE spectrum.
CONTEXT: Holoprosencephaly (HPE) is a developmental defect characterized by wide phenotypic variability, ranging from minor midline malformations (eg, single central incisor) to severe deformities. In 10-15% of HPE patients, mutations in specific genes have been identified (eg, SHH, TGIF, SIX3). Pituitary stalk interruption syndrome (PSIS) constitutes a distinct abnormality of unknown pathogenesis, whereas isolated pituitary hypoplasia (IPH) has been linked to various developmental genes. OBJECTIVE: Three of our patients with PSIS had a single central incisor, a malformation encountered in some HPE cases. Based on this observation, we initiated a search for mutations in HPE-associated genes in 30 patients with PSIS or IPH. DESIGN AND PARTICIPANTS: The entire coding region of the TGIF, SHH, and SIX3 genes was sequenced in patients with combined pituitary hormone deficiency associated with either PSIS or IPH and in healthy controls. RESULTS: Two novel mutations in the HPE-related genes were detected (ie, c.799 C>T, p.Q267X in the TGIF gene, and c.1279G>A, p.G427R in the SHH gene) in 2 of our patients. The overall incidence of HPE-related gene mutations in our nonsyndromic and nonchromosomal patients was 6.6%. No molecular defect in the SIX3 gene was detected in our cohort. CONCLUSIONS: The data suggest that HPE-related gene mutations are implicated in the etiology of isolated pituitary defects (PSIS or IPH). Alternatively, PSIS or IPH may constitute mild forms of an expanded HPE spectrum.
Authors: Ender Karaca; Ramazan Buyukkaya; Davut Pehlivan; Wu-Lin Charng; Kursat O Yaykasli; Yavuz Bayram; Tomasz Gambin; Marjorie Withers; Mehmed M Atik; Ilknur Arslanoglu; Semih Bolu; Serkan Erdin; Ayla Buyukkaya; Emine Yaykasli; Shalini N Jhangiani; Donna M Muzny; Richard A Gibbs; James R Lupski Journal: J Clin Endocrinol Metab Date: 2015-01 Impact factor: 5.958
Authors: Qing Fang; Akima S George; Michelle L Brinkmeier; Amanda H Mortensen; Peter Gergics; Leonard Y M Cheung; Alexandre Z Daly; Adnan Ajmal; María Ines Pérez Millán; A Bilge Ozel; Jacob O Kitzman; Ryan E Mills; Jun Z Li; Sally A Camper Journal: Endocr Rev Date: 2016-11-09 Impact factor: 19.871
Authors: Emily J Lodge; Paraskevi Xekouki; Tatiane S Silva; Cristiane Kochi; Carlos A Longui; Fabio R Faucz; Alice Santambrogio; James L Mills; Nathan Pankratz; John Lane; Dominika Sosnowska; Tina Hodgson; Amanda L Patist; Philippa Francis-West; Francoise Helmbacher; Constantine Stratakis; Cynthia L Andoniadou Journal: JCI Insight Date: 2020-10-27