Contiguous deletion of SLC6A8 and BAP31 in a patient with severe dystonia and sensorineural deafness.
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| Abstract |
We report here a 6-year-old boy exhibiting severe dystonia, profound intellectual and developmental disability with liver disease, and sensorineural deafness. A deficient creatine peak in brain (1)H-MR spectroscopy and high ratio of creatine/creatinine concentration in his urine lead us to suspect a creatine transporter (solute carrier family 6, member 8; SLC6A8) deficiency, which was confirmed by the inability to take up creatine into fibroblasts. We found a large ~19 kb deletion encompassing exons 5-13 of SLC6A8 and exons 5-8 of the B-cell receptor-associated protein (BAP31) gene. This case is the first report in which the SLC6A8 and BAP31 genes are both deleted. The phenotype of BAP31 mutations has been reported only as a part of Xq28 deletion syndrome or contiguous ATP-binding cassette, sub-family D, member 1 (ABCD1)/DXS1375E (BAP31) deletion syndrome [MIM ID #300475], where liver dysfunction and sensorineural deafness have been suggested to be attributed to the loss of function of BAP31. Our case supports the idea that the loss of BAP31 is related to liver dysfunction and hearing loss.
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| Authors | Hitoshi Osaka, Atsushi Takagi, Yu Tsuyusaki, Takahito Wada, Mizue Iai, Sumimasa Yamashita, Hiroko Shimbo, Hirotomo Saitsu, Gajja S Salomons, Cornelis Jakobs, Noriko Aida, Shinka Toshihiro, Tomiko Kuhara, Naomichi Matsumoto |
| Journal | Molecular genetics and metabolism (Mol Genet Metab) Vol. 106 Issue 1 Pg. 43-7 (May 2012) ISSN: 1096-7206 [Electronic] United States |
| PMID | 22472424 (Publication Type: Case Reports, Journal Article, Research Support, Non-U.S. Gov't) |
| Copyright | Copyright © 2012 Elsevier Inc. All rights reserved. |
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