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Mol Genet Genomic Med. 2019 Nov;7(11):e969. doi: 10.1002/mgg3.969. Epub 2019 Sep 7.

Homozygous missense variant in BMPR1A resulting in BMPR signaling disruption and syndromic features.

Author information

1
Division of Human Genetics, Cincinnati Children's Hospital and University of Cincinnati College of Medicine Department of Pediatrics, Cincinnati, OH, USA.
2
Department of Molecular, Cell & Developmental Biology, UCLA, Los Angeles, CA, USA.
3
Department of Radiology, Cincinnati Children's Hospital, Cincinnati, OH, USA.
4
Department of Pediatrics, United Arab Emirates University, Abu Dhabi, United Arab Emirates.
5
Department of Orthopaedic Surgery, UCLA, Los Angeles, CA, USA.
6
Division of Endocrinology, Cincinnati Children's Hospital and University of Cincinnati College of Medicine, Department of Pediatrics, Cincinnati, OH, USA.

Abstract

BACKGROUND:

The bone morphogenetic protein (BMP) pathway is known to play an imperative role in bone, cartilage, and cardiac tissue formation. Truncating, heterozygous variants, and deletions of one of the essential receptors in this pathway, Bone Morphogenetic Protein Receptor Type1A (BMPR1A), have been associated with autosomal dominant juvenile polyposis. Heterozygous deletions have also been associated with cardiac and minor skeletal anomalies. Populations with atrioventricular septal defects are enriched for rare missense BMPR1A variants.

METHODS:

We report on a patient with a homozygous missense variant in BMPR1A causing skeletal abnormalities, growth failure a large atrial septal defect, severe subglottic stenosis, laryngomalacia, facial dysmorphisms, and developmental delays.

RESULTS:

Functional analysis of this variant shows increased chondrocyte death for cells with the mutated receptor, increased phosphorylated R-Smads1/5/8, and loss of Sox9 expression mediated by decreased phosphorylation of p38.

CONCLUSION:

This homozygous missense variant in BMPR1A appears to cause a distinct clinical phenotype.

KEYWORDS:

BMP; atrial septal defect; bmpr1a protein; bone morphogenetic protein; human

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