A novel 13 base pair insertion in the sonic hedgehog ZRS limb enhancer (ZRS/LMBR1) causes preaxial polydactyly with triphalangeal thumb. 2012

Tobias Laurell, and Julia E Vandermeer, and Aaron M Wenger, and Giedre Grigelioniene, and Agneta Nordenskjöld, and Marianne Arner, and Anna Gerber Ekblom, and Gill Bejerano, and Nadav Ahituv, and Ann Nordgren
Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden.

Mutations in the Sonic hedgehog limb enhancer, the zone of polarizing activity regulatory sequence (ZRS, located within the gene LMBR1), commonly called the ZRS), cause limb malformations. In humans, three classes of mutations have been proposed based on the limb phenotype; single base changes throughout the region cause preaxial polydactyly (PPD), single base changes at one specific site cause Werner mesomelic syndrome, and large duplications cause polysyndactyly. This study presents a novel mutation-a small insertion. In a Swedish family with autosomal-dominant PPD, we found a 13 base pair insertion within the ZRS, NG_009240.1:g.106934_106935insTAAGGAAGTGATT (traditional nomenclature: ZRS603ins13). Computational transcription factor-binding site predictions suggest that this insertion creates new binding sites and a mouse enhancer assay shows that this insertion causes ectopic gene expression. This study is the first to discover a small insertion in an enhancer that causes a human limb malformation and suggests a potential mechanism that could explain the ectopic expression caused by this mutation.

UI MeSH Term Description Entries
D008565 Membrane Proteins Proteins which are found in membranes including cellular and intracellular membranes. They consist of two types, peripheral and integral proteins. They include most membrane-associated enzymes, antigenic proteins, transport proteins, and drug, hormone, and lectin receptors. Cell Membrane Protein,Cell Membrane Proteins,Cell Surface Protein,Cell Surface Proteins,Integral Membrane Proteins,Membrane-Associated Protein,Surface Protein,Surface Proteins,Integral Membrane Protein,Membrane Protein,Membrane-Associated Proteins,Membrane Associated Protein,Membrane Associated Proteins,Membrane Protein, Cell,Membrane Protein, Integral,Membrane Proteins, Integral,Protein, Cell Membrane,Protein, Cell Surface,Protein, Integral Membrane,Protein, Membrane,Protein, Membrane-Associated,Protein, Surface,Proteins, Cell Membrane,Proteins, Cell Surface,Proteins, Integral Membrane,Proteins, Membrane,Proteins, Membrane-Associated,Proteins, Surface,Surface Protein, Cell
D006228 Hand Deformities, Congenital Alterations or deviations from normal shape or size which result in a disfigurement of the hand occurring at or before birth. Congenital Hand Deformities,Congenital Hand Deformity,Deformities, Congenital Hand,Deformity, Congenital Hand,Hand Deformity, Congenital
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013933 Thumb The first digit on the radial side of the hand which in humans lies opposite the other four. Thumbs
D016254 Mutagenesis, Insertional Mutagenesis where the mutation is caused by the introduction of foreign DNA sequences into a gene or extragenic sequence. This may occur spontaneously in vivo or be experimentally induced in vivo or in vitro. Proviral DNA insertions into or adjacent to a cellular proto-oncogene can interrupt GENETIC TRANSLATION of the coding sequences or interfere with recognition of regulatory elements and cause unregulated expression of the proto-oncogene resulting in tumor formation. Gene Insertion,Insertion Mutation,Insertional Activation,Insertional Mutagenesis,Linker-Insertion Mutagenesis,Mutagenesis, Cassette,Sequence Insertion,Viral Insertional Mutagenesis,Activation, Insertional,Activations, Insertional,Cassette Mutagenesis,Gene Insertions,Insertion Mutations,Insertion, Gene,Insertion, Sequence,Insertional Activations,Insertional Mutagenesis, Viral,Insertions, Gene,Insertions, Sequence,Linker Insertion Mutagenesis,Mutagenesis, Linker-Insertion,Mutagenesis, Viral Insertional,Mutation, Insertion,Mutations, Insertion,Sequence Insertions
D017689 Polydactyly A congenital anomaly of the hand or foot, marked by the presence of supernumerary digits. Hyperdactyly,Polydactylia,Polydactylism,Hyperdactylies,Polydactylias,Polydactylies,Polydactylisms

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