Mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic Chinese.
An inactivating mutation in the GNAS gene causes either pseudohypoparathyroidism 1a (PHP1A) when it is maternally inherited or pseudopseudohypoparathyroidism (PPHP) when it is paternally inherited. We investigated clinical manifestations and mutations of the GNAS gene in ethnic Chinese patients with...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2014-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3961212?pdf=render |
| _version_ | 1811274035610255360 |
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| author | Yi-Lei Wu Daw-Yang Hwang Hui-Pin Hsiao Wei-Hsin Ting Chi-Yu Huang Wen-Yu Tsai Hung-Chun Chen Mei-Chyn Chao Fu-Sung Lo Jeng-Daw Tsai Stone Yang Shin-Lin Shih Shuan-Pei Lin Chiung-Ling Lin Yann-Jinn Lee |
| author_facet | Yi-Lei Wu Daw-Yang Hwang Hui-Pin Hsiao Wei-Hsin Ting Chi-Yu Huang Wen-Yu Tsai Hung-Chun Chen Mei-Chyn Chao Fu-Sung Lo Jeng-Daw Tsai Stone Yang Shin-Lin Shih Shuan-Pei Lin Chiung-Ling Lin Yann-Jinn Lee |
| author_sort | Yi-Lei Wu |
| collection | DOAJ |
| description | An inactivating mutation in the GNAS gene causes either pseudohypoparathyroidism 1a (PHP1A) when it is maternally inherited or pseudopseudohypoparathyroidism (PPHP) when it is paternally inherited. We investigated clinical manifestations and mutations of the GNAS gene in ethnic Chinese patients with PHP1A or PPHP. Seven patients from 5 families including 4 girls and 2 boys with PHP1A and 1 girl with PPHP were studied. All PHP1A patients had mental retardation. They were treated with calcitriol and CaCO3 with regular monitoring of serum Ca levels, urinary Ca/Cr ratios, and renal sonography. Among them, 5 patients also had primary hypothyroidism suggesting TSH resistance. One female patient had a renal stone which was treated with extracorporeal shockwave lithotripsy. She had an increased urinary Ca/Cr ratio of 0.481 mg/mg when the stone was detected. We detected mutations using PCR and sequencing as well as analysed a splice acceptor site mutation using RT-PCR, sequencing, and minigene construct. We detected 5 mutations: c.85C>T (Q29*), c.103C>T (Q35*), c.840-2A>G (R280Sfs*21), c.1027_1028delGA (D343*), and c.1174G>A (E392K). Mutations c.840-2A>G and c.1027_1028delGA were novel. The c.840-2A>G mutation at the splice acceptor site of intron 10 caused retention of intron 10 in the minigene construct but skipping of exon 11 in the peripheral blood cells. The latter was the most probable mechanism which caused a frameshift, changing Arg to Ser at residue 280 and invoking a premature termination of translation at codon 300 (R280Sfs*21). Five GNAS mutations in ethnic Chinese with PHP1A and PPHP were reported. Two of them were novel. Mutation c.840-2A>G destroyed a spice acceptor site and caused exon skipping. Regular monitoring and adjustment in therapy are mandatory to achieve optimal therapeutic effects and avoid nephrolithiasis in patients with PHP1A. |
| first_indexed | 2024-04-12T23:10:33Z |
| format | Article |
| id | doaj.art-6c81de158484432583f7e93354c9eec0 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-12T23:10:33Z |
| publishDate | 2014-01-01 |
| publisher | Public Library of Science (PLoS) |
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| spelling | doaj.art-6c81de158484432583f7e93354c9eec02022-12-22T03:12:48ZengPublic Library of Science (PLoS)PLoS ONE1932-62032014-01-0193e9064010.1371/journal.pone.0090640Mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic Chinese.Yi-Lei WuDaw-Yang HwangHui-Pin HsiaoWei-Hsin TingChi-Yu HuangWen-Yu TsaiHung-Chun ChenMei-Chyn ChaoFu-Sung LoJeng-Daw TsaiStone YangShin-Lin ShihShuan-Pei LinChiung-Ling LinYann-Jinn LeeAn inactivating mutation in the GNAS gene causes either pseudohypoparathyroidism 1a (PHP1A) when it is maternally inherited or pseudopseudohypoparathyroidism (PPHP) when it is paternally inherited. We investigated clinical manifestations and mutations of the GNAS gene in ethnic Chinese patients with PHP1A or PPHP. Seven patients from 5 families including 4 girls and 2 boys with PHP1A and 1 girl with PPHP were studied. All PHP1A patients had mental retardation. They were treated with calcitriol and CaCO3 with regular monitoring of serum Ca levels, urinary Ca/Cr ratios, and renal sonography. Among them, 5 patients also had primary hypothyroidism suggesting TSH resistance. One female patient had a renal stone which was treated with extracorporeal shockwave lithotripsy. She had an increased urinary Ca/Cr ratio of 0.481 mg/mg when the stone was detected. We detected mutations using PCR and sequencing as well as analysed a splice acceptor site mutation using RT-PCR, sequencing, and minigene construct. We detected 5 mutations: c.85C>T (Q29*), c.103C>T (Q35*), c.840-2A>G (R280Sfs*21), c.1027_1028delGA (D343*), and c.1174G>A (E392K). Mutations c.840-2A>G and c.1027_1028delGA were novel. The c.840-2A>G mutation at the splice acceptor site of intron 10 caused retention of intron 10 in the minigene construct but skipping of exon 11 in the peripheral blood cells. The latter was the most probable mechanism which caused a frameshift, changing Arg to Ser at residue 280 and invoking a premature termination of translation at codon 300 (R280Sfs*21). Five GNAS mutations in ethnic Chinese with PHP1A and PPHP were reported. Two of them were novel. Mutation c.840-2A>G destroyed a spice acceptor site and caused exon skipping. Regular monitoring and adjustment in therapy are mandatory to achieve optimal therapeutic effects and avoid nephrolithiasis in patients with PHP1A.http://europepmc.org/articles/PMC3961212?pdf=render |
| spellingShingle | Yi-Lei Wu Daw-Yang Hwang Hui-Pin Hsiao Wei-Hsin Ting Chi-Yu Huang Wen-Yu Tsai Hung-Chun Chen Mei-Chyn Chao Fu-Sung Lo Jeng-Daw Tsai Stone Yang Shin-Lin Shih Shuan-Pei Lin Chiung-Ling Lin Yann-Jinn Lee Mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic Chinese. PLoS ONE |
| title | Mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic Chinese. |
| title_full | Mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic Chinese. |
| title_fullStr | Mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic Chinese. |
| title_full_unstemmed | Mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic Chinese. |
| title_short | Mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic Chinese. |
| title_sort | mutations in pseudohypoparathyroidism 1a and pseudopseudohypoparathyroidism in ethnic chinese |
| url | http://europepmc.org/articles/PMC3961212?pdf=render |
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