A postnatal role for embryonic myosin revealed by MYH3 mutations that alter TGFβ signaling and cause autosomal dominant spondylocarpotarsal synostosis.

TitleA postnatal role for embryonic myosin revealed by MYH3 mutations that alter TGFβ signaling and cause autosomal dominant spondylocarpotarsal synostosis.
Publication TypeJournal Article
Year of Publication2017
AuthorsZieba, J, Zhang, W, Chong, JX, Forlenza, KN, Martin, JH, Heard, K, Grange, DK, Butler, MG, Kleefstra, T, Lachman, RS, Nickerson, D, Regnier, M, Cohn, DH, Bamshad, M, Krakow, D
JournalSci Rep
Volume7
Pagination41803
Date Published2017 Feb 16
ISSN2045-2322
Abstract

Spondylocarpotarsal synostosis (SCT) is a skeletal disorder characterized by progressive vertebral, carpal and tarsal fusions, and mild short stature. The majority of affected individuals have an autosomal recessive form of SCT and are homozygous or compound heterozygous for nonsense mutations in the gene that encodes the cytoskeletal protein filamin B (FLNB), but a subset do not have FLNB mutations. Exome sequence analysis of three SCT patients negative for FLNB mutations identified an autosomal dominant form of the disease due to heterozygosity for missense or nonsense mutations in MYH3, which encodes embryonic myosin. Cells transfected with the MYH3 missense mutations had reduced TGFβ signaling, revealing a regulatory role for embryonic myosin in the TGFβ signaling pathway. In wild-type mice, there was persistent postnatal expression of embryonic myosin in the small muscles joining the neural arches of the spine suggesting that loss of myosin function in these muscles contribute to the disease. Our findings demonstrate that dominant mutations in MYH3 underlie autosomal dominant SCT, identify a postnatal role for embryonic myosin and suggest that altered regulation of signal transduction in the muscles within the spine may lead to the development of vertebral fusions.

DOI10.1038/srep41803
Alternate JournalSci Rep
PubMed ID28205584
PubMed Central IDPMC5311977
Grant ListU54 HG006493 / HG / NHGRI NIH HHS / United States
UL1 TR000124 / TR / NCATS NIH HHS / United States
F31 AR066487 / AR / NIAMS NIH HHS / United States
R01 AR066124 / AR / NIAMS NIH HHS / United States
R01 AR062651 / AR / NIAMS NIH HHS / United States