CDKL5 belongs to the same molecular pathway of MeCP2 and it is responsible for the early-onset seizure variant of Rett syndrome

Francesca Mari, Sara Azimonti, Ilaria Bertani, Fabrizio Bolognese, Elena Colombo, Rossella Caselli, Elisa Scala, Ilaria Longo, Salvatore Grosso, Chiara Pescucci, Francesca Ariani, Giuseppe Hayek, Paolo Balestri, Anna Bergo, Gianfranco Badaracco, Michele Zappella, Vania Broccoli, Alessandra Renieri, Charlotte Kilstrup-Nielsen, Nicoletta Landsberger

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Abstract

Rett syndrome (RTT) is a severe neurodevelopmental disorder almost exclusively affecting females and characterized by a wide spectrum of clinical manifestations. Most patients affected by classic RTT and a smaller percentage of patients with the milder form 'preserved speech variant' have either point mutations or deletions/duplications in the MECP2 gene. Recently, mutations in the CDKL5 gene, coding for a putative kinase, have been found in female patients with a phenotype overlapping with that of RTT. Here, we report two patients with the early seizure variant of RTT, bearing two novel CDKL5 truncating mutations, strengthening the correlation between CDKL5 and RTT. Considering the similar phenotypes caused by mutations in MECP2 and CDKL5, it has been suggested that the two genes play a role in common pathogenic processes. We show here that CDKL5 is a nuclear protein whose expression in the nervous system overlaps with that of MeCP2, during neural maturation and synaptogenesis. Importantly, we demonstrate that MeCP2 and CDKL5 interact both in vivo and in vitro and that CDKL5 is indeed a kinase, which is able to phosphorylate itself and to mediate MeCP2 phosphorylation, suggesting that they belong to the same molecular pathway. Furthermore, this paper contributes to the clarification of the phenotype associated with CDKL5 mutations and indicates that CDKL5 should be analyzed in each patient showing a clinical course similar to RTT but characterized by a lack of an early normal period due to the presence of seizures.

Original languageEnglish
Pages (from-to)1935-1946
Number of pages12
JournalHuman Molecular Genetics
Volume14
Issue number14
DOIs
Publication statusPublished - Jul 15 2005

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Rett Syndrome
Seizures
Mutation
Phenotype
Phosphotransferases
Genes
Nuclear Proteins
Point Mutation
Nervous System
Phosphorylation

ASJC Scopus subject areas

  • Genetics

Cite this

Mari, F., Azimonti, S., Bertani, I., Bolognese, F., Colombo, E., Caselli, R., ... Landsberger, N. (2005). CDKL5 belongs to the same molecular pathway of MeCP2 and it is responsible for the early-onset seizure variant of Rett syndrome. Human Molecular Genetics, 14(14), 1935-1946. https://doi.org/10.1093/hmg/ddi198

CDKL5 belongs to the same molecular pathway of MeCP2 and it is responsible for the early-onset seizure variant of Rett syndrome. / Mari, Francesca; Azimonti, Sara; Bertani, Ilaria; Bolognese, Fabrizio; Colombo, Elena; Caselli, Rossella; Scala, Elisa; Longo, Ilaria; Grosso, Salvatore; Pescucci, Chiara; Ariani, Francesca; Hayek, Giuseppe; Balestri, Paolo; Bergo, Anna; Badaracco, Gianfranco; Zappella, Michele; Broccoli, Vania; Renieri, Alessandra; Kilstrup-Nielsen, Charlotte; Landsberger, Nicoletta.

In: Human Molecular Genetics, Vol. 14, No. 14, 15.07.2005, p. 1935-1946.

Research output: Contribution to journalArticle

Mari, F, Azimonti, S, Bertani, I, Bolognese, F, Colombo, E, Caselli, R, Scala, E, Longo, I, Grosso, S, Pescucci, C, Ariani, F, Hayek, G, Balestri, P, Bergo, A, Badaracco, G, Zappella, M, Broccoli, V, Renieri, A, Kilstrup-Nielsen, C & Landsberger, N 2005, 'CDKL5 belongs to the same molecular pathway of MeCP2 and it is responsible for the early-onset seizure variant of Rett syndrome', Human Molecular Genetics, vol. 14, no. 14, pp. 1935-1946. https://doi.org/10.1093/hmg/ddi198
Mari, Francesca ; Azimonti, Sara ; Bertani, Ilaria ; Bolognese, Fabrizio ; Colombo, Elena ; Caselli, Rossella ; Scala, Elisa ; Longo, Ilaria ; Grosso, Salvatore ; Pescucci, Chiara ; Ariani, Francesca ; Hayek, Giuseppe ; Balestri, Paolo ; Bergo, Anna ; Badaracco, Gianfranco ; Zappella, Michele ; Broccoli, Vania ; Renieri, Alessandra ; Kilstrup-Nielsen, Charlotte ; Landsberger, Nicoletta. / CDKL5 belongs to the same molecular pathway of MeCP2 and it is responsible for the early-onset seizure variant of Rett syndrome. In: Human Molecular Genetics. 2005 ; Vol. 14, No. 14. pp. 1935-1946.
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AU - Mari, Francesca

AU - Azimonti, Sara

AU - Bertani, Ilaria

AU - Bolognese, Fabrizio

AU - Colombo, Elena

AU - Caselli, Rossella

AU - Scala, Elisa

AU - Longo, Ilaria

AU - Grosso, Salvatore

AU - Pescucci, Chiara

AU - Ariani, Francesca

AU - Hayek, Giuseppe

AU - Balestri, Paolo

AU - Bergo, Anna

AU - Badaracco, Gianfranco

AU - Zappella, Michele

AU - Broccoli, Vania

AU - Renieri, Alessandra

AU - Kilstrup-Nielsen, Charlotte

AU - Landsberger, Nicoletta

PY - 2005/7/15

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N2 - Rett syndrome (RTT) is a severe neurodevelopmental disorder almost exclusively affecting females and characterized by a wide spectrum of clinical manifestations. Most patients affected by classic RTT and a smaller percentage of patients with the milder form 'preserved speech variant' have either point mutations or deletions/duplications in the MECP2 gene. Recently, mutations in the CDKL5 gene, coding for a putative kinase, have been found in female patients with a phenotype overlapping with that of RTT. Here, we report two patients with the early seizure variant of RTT, bearing two novel CDKL5 truncating mutations, strengthening the correlation between CDKL5 and RTT. Considering the similar phenotypes caused by mutations in MECP2 and CDKL5, it has been suggested that the two genes play a role in common pathogenic processes. We show here that CDKL5 is a nuclear protein whose expression in the nervous system overlaps with that of MeCP2, during neural maturation and synaptogenesis. Importantly, we demonstrate that MeCP2 and CDKL5 interact both in vivo and in vitro and that CDKL5 is indeed a kinase, which is able to phosphorylate itself and to mediate MeCP2 phosphorylation, suggesting that they belong to the same molecular pathway. Furthermore, this paper contributes to the clarification of the phenotype associated with CDKL5 mutations and indicates that CDKL5 should be analyzed in each patient showing a clinical course similar to RTT but characterized by a lack of an early normal period due to the presence of seizures.

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