6-Pyruvoyltetrahydropterin Synthase Deficiency: Review and Report of 28 Arab Subjects

Mohammed Almannai, Rana Felemban, Mohammed A. Saleh, Eissa A. Faqeih, Ali Alasmari, Amal AlHashem, Sarar Mohamed, Rawda Sunbul, Fathiya AL-Murshedi, Khalid Al-Thihli, Wafaa Eyaid, Rehab Ali, Tawfeg Ben-Omran, Nenad Blau, Ayman W. El-Hattab, Majid Alfadhel

Research output: Contribution to journalArticle

Abstract

Background: Tetrahydrobiopterin is an essential cofactor for the hydroxylation of aromatic amino acids phenylalanine, tyrosine, and tryptophan. Therefore, tetrahydrobiopterin deficiency results in hyperphenylalaninemia as well as dopamine and serotonin depletion in the central nervous system. The enzyme 6-pyruvoyltetrahydropterin synthase catalyzes the second step of de novo synthesis of tetrahydrobiopterin, and its deficiency is the most frequent cause of tetrahydrobiopterin metabolism disorders. Method: We conducted a retrospective chart review of 28 subjects from 24 families with molecularly confirmed 6-pyruvoyltetrahydropterin synthase deficiency from six centers in three Arab countries. We reviewed clinical, biochemical, and molecular data. We also reviewed previously published cohorts of subjects with 6-pyruvoyltetrahydropterin synthase deficiency. Results: Similar to previous observations, we show that early treatment (less than two months) is associated with better outcome. We identify eight PTS variants in 24 independent families. The most common variant is (c.238A>G; p.M80V) with an allele count of 33%. We also identify one novel variant (c.2T>G; p.?). Conclusion: The deficiency of 6-pyruvoyltetrahydropterin synthase is relatively common in the Arab population and should be considered in individuals with hyperphenylalaninemia. More natural history studies with comprehensive biochemical and molecular genetics data are needed for a robust base for the development of future therapy.

Original languageEnglish
JournalPediatric Neurology
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Phenylketonurias
Molecular Biology
Aromatic Amino Acids
Middle East
Hydroxylation
Natural History
Phenylalanine
Tryptophan
Tyrosine
Dopamine
Serotonin
Central Nervous System
Alleles
6-pyruvoyltetrahydropterin synthase
Enzymes
Therapeutics
Population
sapropterin

Keywords

  • inborn errors of metabolism
  • phenylketonuria
  • PTPS deficiency
  • tetrahydrobiopterin

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Neurology
  • Developmental Neuroscience
  • Clinical Neurology

Cite this

Almannai, M., Felemban, R., Saleh, M. A., Faqeih, E. A., Alasmari, A., AlHashem, A., ... Alfadhel, M. (2019). 6-Pyruvoyltetrahydropterin Synthase Deficiency: Review and Report of 28 Arab Subjects. Pediatric Neurology. https://doi.org/10.1016/j.pediatrneurol.2019.02.008

6-Pyruvoyltetrahydropterin Synthase Deficiency : Review and Report of 28 Arab Subjects. / Almannai, Mohammed; Felemban, Rana; Saleh, Mohammed A.; Faqeih, Eissa A.; Alasmari, Ali; AlHashem, Amal; Mohamed, Sarar; Sunbul, Rawda; AL-Murshedi, Fathiya; Al-Thihli, Khalid; Eyaid, Wafaa; Ali, Rehab; Ben-Omran, Tawfeg; Blau, Nenad; El-Hattab, Ayman W.; Alfadhel, Majid.

In: Pediatric Neurology, 01.01.2019.

Research output: Contribution to journalArticle

Almannai, M, Felemban, R, Saleh, MA, Faqeih, EA, Alasmari, A, AlHashem, A, Mohamed, S, Sunbul, R, AL-Murshedi, F, Al-Thihli, K, Eyaid, W, Ali, R, Ben-Omran, T, Blau, N, El-Hattab, AW & Alfadhel, M 2019, '6-Pyruvoyltetrahydropterin Synthase Deficiency: Review and Report of 28 Arab Subjects', Pediatric Neurology. https://doi.org/10.1016/j.pediatrneurol.2019.02.008
Almannai, Mohammed ; Felemban, Rana ; Saleh, Mohammed A. ; Faqeih, Eissa A. ; Alasmari, Ali ; AlHashem, Amal ; Mohamed, Sarar ; Sunbul, Rawda ; AL-Murshedi, Fathiya ; Al-Thihli, Khalid ; Eyaid, Wafaa ; Ali, Rehab ; Ben-Omran, Tawfeg ; Blau, Nenad ; El-Hattab, Ayman W. ; Alfadhel, Majid. / 6-Pyruvoyltetrahydropterin Synthase Deficiency : Review and Report of 28 Arab Subjects. In: Pediatric Neurology. 2019.
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abstract = "Background: Tetrahydrobiopterin is an essential cofactor for the hydroxylation of aromatic amino acids phenylalanine, tyrosine, and tryptophan. Therefore, tetrahydrobiopterin deficiency results in hyperphenylalaninemia as well as dopamine and serotonin depletion in the central nervous system. The enzyme 6-pyruvoyltetrahydropterin synthase catalyzes the second step of de novo synthesis of tetrahydrobiopterin, and its deficiency is the most frequent cause of tetrahydrobiopterin metabolism disorders. Method: We conducted a retrospective chart review of 28 subjects from 24 families with molecularly confirmed 6-pyruvoyltetrahydropterin synthase deficiency from six centers in three Arab countries. We reviewed clinical, biochemical, and molecular data. We also reviewed previously published cohorts of subjects with 6-pyruvoyltetrahydropterin synthase deficiency. Results: Similar to previous observations, we show that early treatment (less than two months) is associated with better outcome. We identify eight PTS variants in 24 independent families. The most common variant is (c.238A>G; p.M80V) with an allele count of 33{\%}. We also identify one novel variant (c.2T>G; p.?). Conclusion: The deficiency of 6-pyruvoyltetrahydropterin synthase is relatively common in the Arab population and should be considered in individuals with hyperphenylalaninemia. More natural history studies with comprehensive biochemical and molecular genetics data are needed for a robust base for the development of future therapy.",
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T2 - Review and Report of 28 Arab Subjects

AU - Almannai, Mohammed

AU - Felemban, Rana

AU - Saleh, Mohammed A.

AU - Faqeih, Eissa A.

AU - Alasmari, Ali

AU - AlHashem, Amal

AU - Mohamed, Sarar

AU - Sunbul, Rawda

AU - AL-Murshedi, Fathiya

AU - Al-Thihli, Khalid

AU - Eyaid, Wafaa

AU - Ali, Rehab

AU - Ben-Omran, Tawfeg

AU - Blau, Nenad

AU - El-Hattab, Ayman W.

AU - Alfadhel, Majid

PY - 2019/1/1

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N2 - Background: Tetrahydrobiopterin is an essential cofactor for the hydroxylation of aromatic amino acids phenylalanine, tyrosine, and tryptophan. Therefore, tetrahydrobiopterin deficiency results in hyperphenylalaninemia as well as dopamine and serotonin depletion in the central nervous system. The enzyme 6-pyruvoyltetrahydropterin synthase catalyzes the second step of de novo synthesis of tetrahydrobiopterin, and its deficiency is the most frequent cause of tetrahydrobiopterin metabolism disorders. Method: We conducted a retrospective chart review of 28 subjects from 24 families with molecularly confirmed 6-pyruvoyltetrahydropterin synthase deficiency from six centers in three Arab countries. We reviewed clinical, biochemical, and molecular data. We also reviewed previously published cohorts of subjects with 6-pyruvoyltetrahydropterin synthase deficiency. Results: Similar to previous observations, we show that early treatment (less than two months) is associated with better outcome. We identify eight PTS variants in 24 independent families. The most common variant is (c.238A>G; p.M80V) with an allele count of 33%. We also identify one novel variant (c.2T>G; p.?). Conclusion: The deficiency of 6-pyruvoyltetrahydropterin synthase is relatively common in the Arab population and should be considered in individuals with hyperphenylalaninemia. More natural history studies with comprehensive biochemical and molecular genetics data are needed for a robust base for the development of future therapy.

AB - Background: Tetrahydrobiopterin is an essential cofactor for the hydroxylation of aromatic amino acids phenylalanine, tyrosine, and tryptophan. Therefore, tetrahydrobiopterin deficiency results in hyperphenylalaninemia as well as dopamine and serotonin depletion in the central nervous system. The enzyme 6-pyruvoyltetrahydropterin synthase catalyzes the second step of de novo synthesis of tetrahydrobiopterin, and its deficiency is the most frequent cause of tetrahydrobiopterin metabolism disorders. Method: We conducted a retrospective chart review of 28 subjects from 24 families with molecularly confirmed 6-pyruvoyltetrahydropterin synthase deficiency from six centers in three Arab countries. We reviewed clinical, biochemical, and molecular data. We also reviewed previously published cohorts of subjects with 6-pyruvoyltetrahydropterin synthase deficiency. Results: Similar to previous observations, we show that early treatment (less than two months) is associated with better outcome. We identify eight PTS variants in 24 independent families. The most common variant is (c.238A>G; p.M80V) with an allele count of 33%. We also identify one novel variant (c.2T>G; p.?). Conclusion: The deficiency of 6-pyruvoyltetrahydropterin synthase is relatively common in the Arab population and should be considered in individuals with hyperphenylalaninemia. More natural history studies with comprehensive biochemical and molecular genetics data are needed for a robust base for the development of future therapy.

KW - inborn errors of metabolism

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