Abnormalities of cell packing density and dendritic complexity in the MeCP2 A140V mouse model of Rett syndrome/X-linked mental retardation

Garilyn M. Jentarra, Shannon L. Olfers, Stephen G. Rice, Nishit Srivastava, Gregg E. Homanics, Mary E Blue, Sakkubai Naidu, Vinodh Narayanan

Research output: Contribution to journalArticle

Abstract

Background: Rett syndrome (RTT), a common cause of mental retardation in girls, is associated with mutations in the MECP2 gene. Most human cases of MECP2 mutation in girls result in classical or variant forms of RTT. When these same mutations occur in males, they often present as severe neonatal encephalopathy. However, some MECP2 mutations can also lead to diseases characterized as mental retardation syndromes, particularly in boys. One of these mutations, A140V, is a common, recurring missense mutation accounting for about 0.6% of all MeCP2 mutations and ranking 21st by frequency. It has been described in familial X-linked mental retardation (XLMR), PPM- X syndrome (Parkinsonism, Pyramidal signs, Macroorchidism, X-linked mental retardation) and in other neuropsychiatric syndromes. Interestingly, this mutation has been reported to preserve the methyl-CpG binding function of the MeCP2 protein while compromising its ability to bind to the mental retardation associated protein ATRX.Results: We report the construction and initial characterization of a mouse model expressing the A140V MeCP2 mutation. These initial descriptive studies in male hemizygous mice have revealed brain abnormalities seen in both RTT and mental retardation. The abnormalities found include increases in cell packing density in the brain and a significant reduction in the complexity of neuronal dendritic branching. In contrast to some MeCP2 mutation mouse models, the A140V mouse has an apparently normal lifespan and normal weight gain patterns with no obvious seizures, tremors, breathing difficulties or kyphosis.Conclusion: We have identified various neurological abnormalities in this mouse model of Rett syndrome/X-linked mental retardation which may help to elucidate the manner in which MECP2 mutations cause neuronal changes resulting in mental retardation without the confounding effects of seizures, chronic hypoventilation, or other Rett syndrome associated symptoms.

Original languageEnglish (US)
Article number19
JournalBMC Neuroscience
Volume11
DOIs
StatePublished - Feb 17 2010

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X-Linked Mental Retardation
Rett Syndrome
Cell Count
Mutation
Intellectual Disability
Seizures
Methyl-CpG-Binding Protein 2
Fragile X Syndrome
Hypoventilation
Kyphosis
Aptitude
Brain
Parkinsonian Disorders
Brain Diseases
Tremor
Missense Mutation
Weight Gain
Respiration

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Neuroscience(all)

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Abnormalities of cell packing density and dendritic complexity in the MeCP2 A140V mouse model of Rett syndrome/X-linked mental retardation. / Jentarra, Garilyn M.; Olfers, Shannon L.; Rice, Stephen G.; Srivastava, Nishit; Homanics, Gregg E.; Blue, Mary E; Naidu, Sakkubai; Narayanan, Vinodh.

In: BMC Neuroscience, Vol. 11, 19, 17.02.2010.

Research output: Contribution to journalArticle

Jentarra, Garilyn M. ; Olfers, Shannon L. ; Rice, Stephen G. ; Srivastava, Nishit ; Homanics, Gregg E. ; Blue, Mary E ; Naidu, Sakkubai ; Narayanan, Vinodh. / Abnormalities of cell packing density and dendritic complexity in the MeCP2 A140V mouse model of Rett syndrome/X-linked mental retardation. In: BMC Neuroscience. 2010 ; Vol. 11.
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AU - Jentarra, Garilyn M.

AU - Olfers, Shannon L.

AU - Rice, Stephen G.

AU - Srivastava, Nishit

AU - Homanics, Gregg E.

AU - Blue, Mary E

AU - Naidu, Sakkubai

AU - Narayanan, Vinodh

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AB - Background: Rett syndrome (RTT), a common cause of mental retardation in girls, is associated with mutations in the MECP2 gene. Most human cases of MECP2 mutation in girls result in classical or variant forms of RTT. When these same mutations occur in males, they often present as severe neonatal encephalopathy. However, some MECP2 mutations can also lead to diseases characterized as mental retardation syndromes, particularly in boys. One of these mutations, A140V, is a common, recurring missense mutation accounting for about 0.6% of all MeCP2 mutations and ranking 21st by frequency. It has been described in familial X-linked mental retardation (XLMR), PPM- X syndrome (Parkinsonism, Pyramidal signs, Macroorchidism, X-linked mental retardation) and in other neuropsychiatric syndromes. Interestingly, this mutation has been reported to preserve the methyl-CpG binding function of the MeCP2 protein while compromising its ability to bind to the mental retardation associated protein ATRX.Results: We report the construction and initial characterization of a mouse model expressing the A140V MeCP2 mutation. These initial descriptive studies in male hemizygous mice have revealed brain abnormalities seen in both RTT and mental retardation. The abnormalities found include increases in cell packing density in the brain and a significant reduction in the complexity of neuronal dendritic branching. In contrast to some MeCP2 mutation mouse models, the A140V mouse has an apparently normal lifespan and normal weight gain patterns with no obvious seizures, tremors, breathing difficulties or kyphosis.Conclusion: We have identified various neurological abnormalities in this mouse model of Rett syndrome/X-linked mental retardation which may help to elucidate the manner in which MECP2 mutations cause neuronal changes resulting in mental retardation without the confounding effects of seizures, chronic hypoventilation, or other Rett syndrome associated symptoms.

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