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[Study on tetrahydrobiopterin deficiency in Northern Chinese population].
Zhonghua Yi Xue Yi Chuan Xue Za Zhi. 2006 Jun; 23(3):275-9.ZY

Abstract

OBJECTIVE

To emphasize early differential diagnosis from patients with hyperphenylalaninemia (HPA) and to evaluate the treatment and long-term outcome of patients with tetrahydrobiopterin synthase (BH4) deficiency in Northern Chinese population.

METHODS

From 1992 to 2005, a total of 618 patients with HPA were diagnosed and/or cared for in our outpatient clinic. Urinary pterin analysis, detection of dihydropteridine reductase (DHPR) activity in blood, and then BH4 loading tests were carried out to differentiate BH4 deficiency in these patients from classical phenylketonuria. BH4 deficient patients were treated with BH4, levodopa and 5-hydroxytryptophane (5-HTP) immediately while the diagnosis was done to disease. Patientso blood phenylalanine levels, psychomotor and intelligence development were followed up.

RESULTS

A total of 38 cases were diagnosed as BH4 deficiency, all of them were revealed as 6-pyruvoyl-tetrahydropterin synthase (PTPS) deficiency from the extremely decreased urine biopterin, normal DHPR activities and drop down of blood phenylalanine level to normal range within 4 to 8 hours after BH4 loading. The most common manifestations were progressively psychomotor and mental retardation to patients even after taking early dietary treatment. The patients were diagnosed and treated with drugs at the ages of 2.1 months to 13 years. With 4 patients died of pneumonia, 7 patients refused to treatment, only 27 patients were under treatment and followed up. The average full scale development or intelligence quotient (DQ/IQ) of patients who were treated within and after 6 months were 86+/- 10 or 66+/- 7 respectively. Development was not even in different aspects. A significant negative correlation was observed between the level of the DQ and the age of treatment commenced (r was -0.714, P< 0.01). Eleven patients experienced the extrapyramidal movement disorders, 3 of them combined with epilepsy. The extrapyramidal disorders were controlled by administration of levodopa.

CONCLUSION

The differential diagnosis for BH4 deficiency should be carried out in all patients with HPA. PTPS deficiency is the most common form of BH4 deficiency in Northern Chinese population. The long-term outcome of these patients benefits from diagnosis and treatment with BH4, levodopa and 5-HTP as early as possible.

Authors+Show Affiliations

China-Japan Friendship Hospital, Beijing, 100029 PR China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

English Abstract
Journal Article

Language

chi

PubMed ID

16767663

Citation

Wang, Lin, et al. "[Study On Tetrahydrobiopterin Deficiency in Northern Chinese Population]." Zhonghua Yi Xue Yi Chuan Xue Za Zhi = Zhonghua Yixue Yichuanxue Zazhi = Chinese Journal of Medical Genetics, vol. 23, no. 3, 2006, pp. 275-9.
Wang L, Yu WM, Li XW, et al. [Study on tetrahydrobiopterin deficiency in Northern Chinese population]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi. 2006;23(3):275-9.
Wang, L., Yu, W. M., Li, X. W., He, C., Chang, M., Shen, M., Zhao, S. P., Fu, G. X., Shen, S., Liu, T. T., & Hsiao, K. J. (2006). [Study on tetrahydrobiopterin deficiency in Northern Chinese population]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi = Zhonghua Yixue Yichuanxue Zazhi = Chinese Journal of Medical Genetics, 23(3), 275-9.
Wang L, et al. [Study On Tetrahydrobiopterin Deficiency in Northern Chinese Population]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi. 2006;23(3):275-9. PubMed PMID: 16767663.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Study on tetrahydrobiopterin deficiency in Northern Chinese population]. AU - Wang,Lin, AU - Yu,Wei-min, AU - Li,Xiao-wen, AU - He,Chun, AU - Chang,Ming, AU - Shen,Ming, AU - Zhao,Shi-ping, AU - Fu,Gui-xiang, AU - Shen,Shu, AU - Liu,Tze-tze, AU - Hsiao,Kuang-jen, PY - 2006/6/13/pubmed PY - 2009/3/28/medline PY - 2006/6/13/entrez SP - 275 EP - 9 JF - Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics JO - Zhonghua Yi Xue Yi Chuan Xue Za Zhi VL - 23 IS - 3 N2 - OBJECTIVE: To emphasize early differential diagnosis from patients with hyperphenylalaninemia (HPA) and to evaluate the treatment and long-term outcome of patients with tetrahydrobiopterin synthase (BH4) deficiency in Northern Chinese population. METHODS: From 1992 to 2005, a total of 618 patients with HPA were diagnosed and/or cared for in our outpatient clinic. Urinary pterin analysis, detection of dihydropteridine reductase (DHPR) activity in blood, and then BH4 loading tests were carried out to differentiate BH4 deficiency in these patients from classical phenylketonuria. BH4 deficient patients were treated with BH4, levodopa and 5-hydroxytryptophane (5-HTP) immediately while the diagnosis was done to disease. Patientso blood phenylalanine levels, psychomotor and intelligence development were followed up. RESULTS: A total of 38 cases were diagnosed as BH4 deficiency, all of them were revealed as 6-pyruvoyl-tetrahydropterin synthase (PTPS) deficiency from the extremely decreased urine biopterin, normal DHPR activities and drop down of blood phenylalanine level to normal range within 4 to 8 hours after BH4 loading. The most common manifestations were progressively psychomotor and mental retardation to patients even after taking early dietary treatment. The patients were diagnosed and treated with drugs at the ages of 2.1 months to 13 years. With 4 patients died of pneumonia, 7 patients refused to treatment, only 27 patients were under treatment and followed up. The average full scale development or intelligence quotient (DQ/IQ) of patients who were treated within and after 6 months were 86+/- 10 or 66+/- 7 respectively. Development was not even in different aspects. A significant negative correlation was observed between the level of the DQ and the age of treatment commenced (r was -0.714, P< 0.01). Eleven patients experienced the extrapyramidal movement disorders, 3 of them combined with epilepsy. The extrapyramidal disorders were controlled by administration of levodopa. CONCLUSION: The differential diagnosis for BH4 deficiency should be carried out in all patients with HPA. PTPS deficiency is the most common form of BH4 deficiency in Northern Chinese population. The long-term outcome of these patients benefits from diagnosis and treatment with BH4, levodopa and 5-HTP as early as possible. SN - 1003-9406 UR - https://wwww.unboundmedicine.com/medline/citation/16767663/[Study_on_tetrahydrobiopterin_deficiency_in_Northern_Chinese_population]_ L2 - http://www.diseaseinfosearch.org/result/7038 DB - PRIME DP - Unbound Medicine ER -