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IMPT1, an imprinted gene similar to polyspecific transporter and multi-drug resistance genes

Dao, D, Frank, D, Qian, NF, O'Keefe, D, Vosatka, RJ, Walsh, CP and Tycko, B (1998) IMPT1, an imprinted gene similar to polyspecific transporter and multi-drug resistance genes. HUMAN MOLECULAR GENETICS, 7 (4). pp. 597-608. [Journal article]

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DOI: 10.1093/hmg/7.4.597


Human chromosome 11p15.5 and distal mouse chromosome 7 include a megabase-scale chromosomal domain with multiple genes subject to parental imprinting, Here we describe mouse and human versions of a novel imprinted gene, IMPT1, which lies between IPL and p57(KIP2) and which encodes a predicted multi-membrane-spanning protein similar to bacterial and eukaryotic polyspecific metabolite transporter and multi-drug resistance pumps. Mouse Impt1 and human IMPT1 mRNAs are highly expressed in tissues with metabolite transport functions, including liver, kidney, intestine, extra-embryonic membranes and placenta, and there is strongly preferential expression of the maternal allele in various mouse tissues at fetal stages. In post-natal tissues there is persistent expression, but the allelic bias attenuates. An allelic expression bias is also observed in human fetal and postnatal tissues, but there is significant interindividual variation and rare somatic allele switching. The fact that Impt1 is relatively repressed on the paternal allele, together with data from other imprinted genes, allows a statistical conclusion that the primary effect of human chromosome 11p15.5/mouse distal chromosome 7 imprinting is domain-wide relative repression of genes on the paternal homolog. Dosage regulation of the metabolite transporter gene(s) by imprinting might regulate placental and fetal growth.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Biomedical Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Genomic Medicine
ID Code:21720
Deposited By: Professor Colum Walsh
Deposited On:02 Apr 2012 09:54
Last Modified:10 May 2017 10:35

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