Allelic Variants in Established Hypopituitarism Genes Expand Our Knowledge of the Phenotypic Spectrum

Author(s):Show less -

Nakaguma, Marilena ^[1] ; Bianchi Pereira Ferreira, Nathalia Garcia ^[1] ; Figueredo Benedetti, Anna Flavia ^{[1, 2]} ; Madi, Mariana Cotarelli ^[1] ; Silva, Juliana Moreira ^[1] ; Li, Jun Z. ^[3] ; Ma, Qianyi ^[3] ; Ozel, Ayse Bilge ^[3] ; Fang, Qing ^[3] ; Narcizo, Amanda de Moraes ^[2] ; Cardoso, Lais Cavalca ^[2] ; Montenegro, Luciana Ribeiro ^{[1, 2]} ; de Assis Funari, Mariana Ferreira ^{[1, 2]} ; Nishi, Mirian Yumie ^{[1, 2]} ; Prado Arnhold, Ivo Jorge ^[1] ; de Lima Jorge, Alexander Augusto ^[4] ; de Mendonca, Berenice Bilharinho ^{[1, 2]} ; Camper, Sally Ann ^[3] ; Carvalho, Luciani R. ^[1]

Affiliation

^[1] Univ Sao Paulo FMUSP, Div Endocrinol, Dev Endocrinol Unit, Lab Hormones & Mol Genet LIM 42, Hosp Clin, Fac Med, Av Dr Eneas de Carvalho Aguiar 155, 2 Andar, BR-05403000 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Fac Med FMUSP, Lab Sequenciamento Larga Escala SELA, BR-01246903 Sao Paulo - Brazil

^[3] Univ Michigan, Dept Human Genet, Ann Arbor, MI 48109 - USA

^[4] Univ Sao Paulo FMUSP, Div Endocrinol, Genet Endocrinol Unit LIM25, Hosp Clin, Fac Med, BR-01246903 Sao Paulo - Brazil

• Document type: Journal article
• Source: GENES; v. 12, n. 8 AUG 2021.
• Web of Science Citations: 0

Abstract

We report four allelic variants (three novel) in three genes previously established as causal for hypopituitarism or related disorders. A novel homozygous variant in the growth hormone gene, GH1 c.171delT (p.Phe 57Leufs{*}43), was found in a male patient with severe isolated growth hormone deficiency (IGHD) born to consanguineous parents. A hemizygous SOX3 allelic variant (p.Met304Ile) was found in a male patient with IGHD and hypoplastic anterior pituitary. YASARA, a tool to evaluate protein stability, suggests that p.Met304Ile destabilizes the SOX3 protein (Delta Delta G = 2.49 kcal/mol). A rare, heterozygous missense variant in the TALE homeobox protein gene, TGIF1 (c.268C>T:p.Arg90Cys) was found in a patient with combined pituitary hormone deficiency (CPHD), diabetes insipidus, and syndromic features of holoprosencephaly (HPE). This variant was previously reported in a patient with severe holoprosencephaly and shown to affect TGIF1 function. A novel heterozygous TGIF1 variant (c.82T>C:p.Ser28Pro) was identified in a patient with CPHD, pituitary aplasia and ectopic posterior lobe. Both TGIF1 variants have an autosomal dominant pattern of inheritance with incomplete penetrance. In conclusion, we have found allelic variants in three genes in hypopituitarism patients. We discuss these variants and associated patient phenotypes in relation to previously reported variants in these genes, expanding our knowledge of the phenotypic spectrum in patient populations. (AU)

• FAPESP's process: 15/26563-7 - Molecular genetic diagnosis in patients with pituitary and gonadal developmental disorders and the use of models in vitro and in vivo to evaluate the functional effect of allelic variants identified by sequencing large scale
• Grantee: Luciani Renata Silveira de Carvalho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/03236-5 - New approaches and methodologies in molecular-genetic studies of growth and pubertal development disorders
• Grantee: Alexander Augusto de Lima Jorge
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/02162-8 - Molecular pathogenesis and characterization of monogenic developmental diseases: a route to translational medicine
• Grantee: Berenice Bilharinho de Mendonça
• Support Opportunities: Research Projects - Thematic Grants