"Skittish" Abca2 knockout mice display tremor, hyper activity, and abnormal myelin ultrastructure in the central nervous system

Jody T. Mack, Vladimir Beljanski, Athena Soulika, Danyelle M. Townsend, Carol B. Brown, Warren Davis, Kenneth D. Tew

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The ATP-binding cassette transporter 2 (ABCA2) is an endolysosomal protein most highly expressed in the central and peripheral nervous system tissues and macrophages. Previous studies indicated its role in cholesterol/steroid (estramustine, estradiol, and progesterone) trafficking/sequestration, oxidative stress response, and Alzheimer's disease. Developmental studies have shown its expression during macrophage and oligodendrocyte differentiation, processes requiring membrane growth. To determine the in vivo function(s) of this transporter, we generated a knockout mouse from a gene-targeted disruption of the marine ABCA2 gene. Knockout males and females are viable and fertile. However, a non-Mendelian inheritance pattern was shown among male progeny of heterozygous crosses. Compared to wild-type and heterozygous littermates, knockout mice displayed a tremor without ataxia, hyperactivity, and reduced body weight; the latter two phenotypes were more marked in females than in males. This sexual disparity suggests a role tor ABCA2 in hormone-dependent neurological and/or developmental pathways. Myelin sheath thickness in the spinal cords of knockout mice was greatly increased compared to that in wild-type mice, while a significant reduction in myelin membrane periodicity (compaction) was observed in both spinal cords and cerebra of knockout mice. Loss of ABCA2 function in vivo resulted in abnormal myelin compaction in spinal cord and cerebrum, an ultrastructural defect that we propose to be the cause of the phenotypic tremor.

Original languageEnglish (US)
Pages (from-to)44-53
Number of pages10
JournalMolecular and Cellular Biology
Volume27
Issue number1
DOIs
StatePublished - Jan 1 2007

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ATP-Binding Cassette Transporters
Tremor
Myelin Sheath
Knockout Mice
Central Nervous System
Spinal Cord
Cerebrum
Macrophages
Estramustine
Nerve Tissue
Inheritance Patterns
Membranes
Oligodendroglia
Peripheral Nervous System
Periodicity
Ataxia
Genes
Progesterone
Estradiol
Alzheimer Disease

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cell Biology

Cite this

"Skittish" Abca2 knockout mice display tremor, hyper activity, and abnormal myelin ultrastructure in the central nervous system. / Mack, Jody T.; Beljanski, Vladimir; Soulika, Athena; Townsend, Danyelle M.; Brown, Carol B.; Davis, Warren; Tew, Kenneth D.

In: Molecular and Cellular Biology, Vol. 27, No. 1, 01.01.2007, p. 44-53.

Research output: Contribution to journalArticle

Mack, Jody T. ; Beljanski, Vladimir ; Soulika, Athena ; Townsend, Danyelle M. ; Brown, Carol B. ; Davis, Warren ; Tew, Kenneth D. / "Skittish" Abca2 knockout mice display tremor, hyper activity, and abnormal myelin ultrastructure in the central nervous system. In: Molecular and Cellular Biology. 2007 ; Vol. 27, No. 1. pp. 44-53.
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