Abstract:
:Ophthalmo-acromelic syndrome (OAS), also known as Waardenburg Anophthalmia syndrome, is defined by the combination of eye malformations, most commonly bilateral anophthalmia, with post-axial oligosyndactyly. Homozygosity mapping and subsequent targeted mutation analysis of a locus on 14q24.2 identified homozygous mutations in SMOC1 (SPARC-related modular calcium binding 1) in eight unrelated families. Four of these mutations are nonsense, two frame-shift, and two missense. The missense mutations are both in the second Thyroglobulin Type-1 (Tg1) domain of the protein. The orthologous gene in the mouse, Smoc1, shows site- and stage-specific expression during eye, limb, craniofacial, and somite development. We also report a targeted pre-conditional gene-trap mutation of Smoc1 (Smoc1(tm1a)) that reduces mRNA to ∼10% of wild-type levels. This gene-trap results in highly penetrant hindlimb post-axial oligosyndactyly in homozygous mutant animals (Smoc1(tm1a/tm1a)). Eye malformations, most commonly coloboma, and cleft palate occur in a significant proportion of Smoc1(tm1a/tm1a) embryos and pups. Thus partial loss of Smoc-1 results in a convincing phenocopy of the human disease. SMOC-1 is one of the two mammalian paralogs of Drosophila Pentagone, an inhibitor of decapentaplegic. The orthologous gene in Xenopus laevis, Smoc-1, also functions as a Bone Morphogenic Protein (BMP) antagonist in early embryogenesis. Loss of BMP antagonism during mammalian development provides a plausible explanation for both the limb and eye phenotype in humans and mice.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Rainger J,van Beusekom E,Ramsay JK,McKie L,Al-Gazali L,Pallotta R,Saponari A,Branney P,Fisher M,Morrison H,Bicknell L,Gautier P,Perry P,Sokhi K,Sexton D,Bardakjian TM,Schneider AS,Elcioglu N,Ozkinay F,Koenig R,Mégdoi
10.1371/journal.pgen.1002114subject
Has Abstractpub_date
2011-07-01 00:00:00pages
e1002114issue
7eissn
1553-7390issn
1553-7404pii
PGENETICS-D-10-00626journal_volume
7pub_type
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