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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Yavor, A. Knoll, J. H. M. Ohta, T. Locke, D. P. Dunai, J. Chai, J-H Nicholls, R. D. Eichler, E. E. Greally, J. M. |
| Description | Country affiliation: United States Author Affiliation: Chai JH ( Center for Neurobiology and Behavior, Department of Psychiatry, University of Pennsylvania, Philadelphia, PA, 19104, USA.) |
| Abstract | Prader-Willi and Angelman syndromes (PWS and AS) typically result from an approximately 4-Mb deletion of human chromosome 15q11-q13, with clustered breakpoints (BP) at either of two proximal sites (BP1 and BP2) and one distal site (BP3). HERC2 and other duplicons map to these BP regions, with the 2-Mb PWS/AS imprinted domain just distal of BP2. Previously, the presence of genes and their imprinted status have not been examined between BP1 and BP2. Here, we identify two known (CYFIP1 and GCP5) and two novel (NIPA1 and NIPA2) genes in this region in human and their orthologs in mouse chromosome 7C. These genes are expressed from a broad range of tissues and are nonimprinted, as they are expressed in cells derived from normal individuals, patients with PWS or AS, and the corresponding mouse models. However, replication-timing studies in the mouse reveal that they are located in a genomic domain showing asynchronous replication, a feature typically ascribed to monoallelically expressed loci. The novel genes NIPA1 and NIPA2 each encode putative polypeptides with nine transmembrane domains, suggesting function as receptors or as transporters. Phylogenetic analyses show that NIPA1 and NIPA2 are highly conserved in vertebrate species, with ancestral members in invertebrates and plants. Intriguingly, evolutionary studies show conservation of the four-gene cassette between BP1 and BP2 in human, including NIPA1/2, CYFIP1, and GCP5, and proximity to the Herc2 gene in both mouse and Fugu. These observations support a model in which duplications of the HERC2 gene at BP3 in primates first flanked the four-gene cassette, with subsequent transposition of these four unique genes by a HERC2 duplicon-mediated process to form the BP1-BP2 region. Duplicons therefore appear to mediate genomic fluidity in both disease and evolutionary processes. |
| ISSN | 00029297 |
| e-ISSN | 15376605 |
| Journal | The American Journal of Human Genetics |
| Issue Number | 4 |
| Volume Number | 73 |
| Language | English |
| Publisher | Cell Press (on behalf of American Society of Human Genetics) |
| Publisher Date | 2003-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Adaptor Proteins, Signal Transducing Angelman Syndrome Genetics Carrier Proteins Chromosomes, Human, Pair 15 Genes, Duplicate Membrane Proteins Prader-willi Syndrome Amino Acid Sequence Animals Chromosome Mapping Dna Primers Exons Expressed Sequence Tags Gene Duplication Introns Mice Molecular Sequence Data Nerve Tissue Proteins Phylogeny Repetitive Sequences, Nucleic Acid Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, P.h.s. Discipline Human Genetics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Genetics (clinical) |
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