SMCHD1 mutations associated with a rare muscular dystrophy can also cause isolated arhinia and Bosma arhinia microphthalmia syndrome.

Journal Article

Arhinia, or absence of the nose, is a rare malformation of unknown etiology that is often accompanied by ocular and reproductive defects. Sequencing of 40 people with arhinia revealed that 84% of probands harbor a missense mutation localized to a constrained region of SMCHD1 encompassing the ATPase domain. SMCHD1 mutations cause facioscapulohumeral muscular dystrophy type 2 (FSHD2) via a trans-acting loss-of-function epigenetic mechanism. We discovered shared mutations and comparable DNA hypomethylation patterning between these distinct disorders. CRISPR/Cas9-mediated alteration of smchd1 in zebrafish yielded arhinia-relevant phenotypes. Transcriptome and protein analyses in arhinia probands and controls showed no differences in SMCHD1 mRNA or protein abundance but revealed regulatory changes in genes and pathways associated with craniofacial patterning. Mutations in SMCHD1 thus contribute to distinct phenotypic spectra, from craniofacial malformation and reproductive disorders to muscular dystrophy, which we speculate to be consistent with oligogenic mechanisms resulting in pleiotropic outcomes.

Full Text

Duke Authors

Cited Authors

  • Shaw, ND; Brand, H; Kupchinsky, ZA; Bengani, H; Plummer, L; Jones, TI; Erdin, S; Williamson, KA; Rainger, J; Stortchevoi, A; Samocha, K; Currall, BB; Dunican, DS; Collins, RL; Willer, JR; Lek, A; Lek, M; Nassan, M; Pereira, S; Kammin, T; Lucente, D; Silva, A; Seabra, CM; Chiang, C; An, Y; Ansari, M; Rainger, JK; Joss, S; Smith, JC; Lippincott, MF; Singh, SS; Patel, N; Jing, JW; Law, JR; Ferraro, N; Verloes, A; Rauch, A; Steindl, K; Zweier, M; Scheer, I; Sato, D; Okamoto, N; Jacobsen, C et al.

Published Date

  • February 2017

Published In

Volume / Issue

  • 49 / 2

Start / End Page

  • 238 - 248

PubMed ID

  • 28067909

Electronic International Standard Serial Number (EISSN)

  • 1546-1718

International Standard Serial Number (ISSN)

  • 1061-4036

Digital Object Identifier (DOI)

  • 10.1038/ng.3743

Language

  • eng