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Functional Analysis of Alleged NOGGIN Mutation G92E Disproves Its Pathogenic Relevance

We identified an amino acid change (p.G92E) in the Bone Morphogenetic Protein antagonist NOGGIN in a 22-month-old boy who presented with a unilateral brachydactyly type B phenotype. Brachydactyly type B is a skeletal malformation that has been associated with increased Bone Morphogenetic Protein pat...

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Autores principales: Zimmer, Julia, Doelken, Sandra C., Horn, Denise, Groppe, Jay C., Shore, Eileen M., Kaplan, Frederick S., Seemann, Petra
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3329551/
https://www.ncbi.nlm.nih.gov/pubmed/22529972
http://dx.doi.org/10.1371/journal.pone.0035062
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author Zimmer, Julia
Doelken, Sandra C.
Horn, Denise
Groppe, Jay C.
Shore, Eileen M.
Kaplan, Frederick S.
Seemann, Petra
author_facet Zimmer, Julia
Doelken, Sandra C.
Horn, Denise
Groppe, Jay C.
Shore, Eileen M.
Kaplan, Frederick S.
Seemann, Petra
author_sort Zimmer, Julia
collection PubMed
description We identified an amino acid change (p.G92E) in the Bone Morphogenetic Protein antagonist NOGGIN in a 22-month-old boy who presented with a unilateral brachydactyly type B phenotype. Brachydactyly type B is a skeletal malformation that has been associated with increased Bone Morphogenetic Protein pathway activation in other patients. Previously, the amino acid change p.G92E in NOGGIN was described as causing fibrodysplasia ossificans progressiva, a rare genetic disorder characterized by limb malformations and progressive heterotopic bone formation in soft tissues that, like Brachydactyly type B, is caused by increased activation of Bone Morphogenetic Protein signaling. To determine whether G92E-NOGGIN shows impaired antagonism that could lead to increased Bone Morphogenetic Protein signaling, we performed functional assays to evaluate inhibition of BMP signaling. Interestingly, wt-NOGGIN shows different inhibition efficacies towards various Bone Morphogenetic Proteins that are known to be essential in limb development. However, comparing the biological activity of G92E-NOGGIN with wt-NOGGIN, we observed that G92E-NOGGIN inhibits activation of bone morphogenetic protein signaling with equal efficiency as wt-NOGGIN, supporting that G92E-NOGGIN does not cause pathological effects. Genetic testing of the child's parents revealed the same amino acid change in the healthy father, further supporting that p.G92E is a neutral amino acid substitution in NOGGIN. We conclude that p.G92E represents a rare polymorphism of the NOGGIN gene - causing neither brachydactyly nor fibrodysplasia ossificans progressiva. This study highlights that a given genetic variation should not be considered pathogenic unless supported by functional analyses.
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spelling pubmed-33295512012-04-23 Functional Analysis of Alleged NOGGIN Mutation G92E Disproves Its Pathogenic Relevance Zimmer, Julia Doelken, Sandra C. Horn, Denise Groppe, Jay C. Shore, Eileen M. Kaplan, Frederick S. Seemann, Petra PLoS One Research Article We identified an amino acid change (p.G92E) in the Bone Morphogenetic Protein antagonist NOGGIN in a 22-month-old boy who presented with a unilateral brachydactyly type B phenotype. Brachydactyly type B is a skeletal malformation that has been associated with increased Bone Morphogenetic Protein pathway activation in other patients. Previously, the amino acid change p.G92E in NOGGIN was described as causing fibrodysplasia ossificans progressiva, a rare genetic disorder characterized by limb malformations and progressive heterotopic bone formation in soft tissues that, like Brachydactyly type B, is caused by increased activation of Bone Morphogenetic Protein signaling. To determine whether G92E-NOGGIN shows impaired antagonism that could lead to increased Bone Morphogenetic Protein signaling, we performed functional assays to evaluate inhibition of BMP signaling. Interestingly, wt-NOGGIN shows different inhibition efficacies towards various Bone Morphogenetic Proteins that are known to be essential in limb development. However, comparing the biological activity of G92E-NOGGIN with wt-NOGGIN, we observed that G92E-NOGGIN inhibits activation of bone morphogenetic protein signaling with equal efficiency as wt-NOGGIN, supporting that G92E-NOGGIN does not cause pathological effects. Genetic testing of the child's parents revealed the same amino acid change in the healthy father, further supporting that p.G92E is a neutral amino acid substitution in NOGGIN. We conclude that p.G92E represents a rare polymorphism of the NOGGIN gene - causing neither brachydactyly nor fibrodysplasia ossificans progressiva. This study highlights that a given genetic variation should not be considered pathogenic unless supported by functional analyses. Public Library of Science 2012-04-18 /pmc/articles/PMC3329551/ /pubmed/22529972 http://dx.doi.org/10.1371/journal.pone.0035062 Text en Zimmer et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Zimmer, Julia
Doelken, Sandra C.
Horn, Denise
Groppe, Jay C.
Shore, Eileen M.
Kaplan, Frederick S.
Seemann, Petra
Functional Analysis of Alleged NOGGIN Mutation G92E Disproves Its Pathogenic Relevance
title Functional Analysis of Alleged NOGGIN Mutation G92E Disproves Its Pathogenic Relevance
title_full Functional Analysis of Alleged NOGGIN Mutation G92E Disproves Its Pathogenic Relevance
title_fullStr Functional Analysis of Alleged NOGGIN Mutation G92E Disproves Its Pathogenic Relevance
title_full_unstemmed Functional Analysis of Alleged NOGGIN Mutation G92E Disproves Its Pathogenic Relevance
title_short Functional Analysis of Alleged NOGGIN Mutation G92E Disproves Its Pathogenic Relevance
title_sort functional analysis of alleged noggin mutation g92e disproves its pathogenic relevance
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3329551/
https://www.ncbi.nlm.nih.gov/pubmed/22529972
http://dx.doi.org/10.1371/journal.pone.0035062
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