A homozygous mutation in HESX1 is associated with evolving hypopituitarism due to impaired repressor-corepressor interaction
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A homozygous mutation in HESX1 is associated with evolving hypopituitarism due to impaired repressor-corepressor interaction. / Carvalho, Luciani R; Woods, Kathryn S; Mendonca, Berenice B; Marcal, Nathalie; Zamparini, Andrea L; Stifani, Stefano; Brickman, Joshua M; Arnhold, Ivo J P; Dattani, Mehul T.
I: The Journal of Clinical Investigation, Bind 112, Nr. 8, 10.2003, s. 1192-201.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - A homozygous mutation in HESX1 is associated with evolving hypopituitarism due to impaired repressor-corepressor interaction
AU - Carvalho, Luciani R
AU - Woods, Kathryn S
AU - Mendonca, Berenice B
AU - Marcal, Nathalie
AU - Zamparini, Andrea L
AU - Stifani, Stefano
AU - Brickman, Joshua M
AU - Arnhold, Ivo J P
AU - Dattani, Mehul T
PY - 2003/10
Y1 - 2003/10
N2 - The paired-like homeobox gene expressed in embryonic stem cells Hesx1/HESX1 encodes a developmental repressor and is expressed in early development in a region fated to form the forebrain, with subsequent localization to Rathke's pouch, the primordium of the anterior pituitary gland. Mutations within the gene have been associated with septo-optic dysplasia, a constellation of phenotypes including eye, forebrain, and pituitary abnormalities, or milder degrees of hypopituitarism. We identified a novel homozygous nonconservative missense mutation (I26T) in the critical Engrailed homology repressor domain (eh1) of HESX1, the first, to our knowledge, to be described in humans, in a girl with evolving combined pituitary hormone deficiency born to consanguineous parents. Neuroimaging revealed a thin pituitary stalk with anterior pituitary hypoplasia and an ectopic posterior pituitary, but no midline or optic nerve abnormalities. This I26T mutation did not affect the DNA-binding ability of HESX1 but led to an impaired ability to recruit the mammalian Groucho homolog/Transducin-like enhancer of split-1 (Gro/TLE1), a crucial corepressor for HESX1, thereby leading to partial loss of repression. Thus, the novel pituitary phenotype highlighted here appears to be a specific consequence of the inability of HESX1 to recruit Groucho-related corepressors, suggesting that other molecular mechanisms govern HESX1 function in the forebrain.
AB - The paired-like homeobox gene expressed in embryonic stem cells Hesx1/HESX1 encodes a developmental repressor and is expressed in early development in a region fated to form the forebrain, with subsequent localization to Rathke's pouch, the primordium of the anterior pituitary gland. Mutations within the gene have been associated with septo-optic dysplasia, a constellation of phenotypes including eye, forebrain, and pituitary abnormalities, or milder degrees of hypopituitarism. We identified a novel homozygous nonconservative missense mutation (I26T) in the critical Engrailed homology repressor domain (eh1) of HESX1, the first, to our knowledge, to be described in humans, in a girl with evolving combined pituitary hormone deficiency born to consanguineous parents. Neuroimaging revealed a thin pituitary stalk with anterior pituitary hypoplasia and an ectopic posterior pituitary, but no midline or optic nerve abnormalities. This I26T mutation did not affect the DNA-binding ability of HESX1 but led to an impaired ability to recruit the mammalian Groucho homolog/Transducin-like enhancer of split-1 (Gro/TLE1), a crucial corepressor for HESX1, thereby leading to partial loss of repression. Thus, the novel pituitary phenotype highlighted here appears to be a specific consequence of the inability of HESX1 to recruit Groucho-related corepressors, suggesting that other molecular mechanisms govern HESX1 function in the forebrain.
KW - Adolescent
KW - Adult
KW - Basic Helix-Loop-Helix Transcription Factors
KW - Child, Preschool
KW - DNA
KW - DNA-Binding Proteins
KW - Homeodomain Proteins
KW - Human Growth Hormone
KW - Humans
KW - Hypopituitarism
KW - Mutation
KW - Nuclear Proteins
KW - Pituitary Hormones
KW - Repressor Proteins
U2 - 10.1172/JCI18589
DO - 10.1172/JCI18589
M3 - Journal article
C2 - 14561704
VL - 112
SP - 1192
EP - 1201
JO - Journal of Clinical Investigation
JF - Journal of Clinical Investigation
SN - 0021-9738
IS - 8
ER -
ID: 129061792