Mutations in KPTN cause macrocephaly, neurodevelopmental delay, and seizures
Emma L Baple1, Reza Maroofian1, Barry A Chioza1
1Monogenic Molecular Genetics, University of Exeter Medical School, St. Luke's Campus, Magdalen Road, Exeter EX1 2LU, UK.
American Journal of Human Genetics
|November 19, 2013
Summary
Mutations in the KPTN gene, encoding kaptin, cause macrocephaly, neurodevelopmental delay, and seizures. Kaptin is crucial for normal human brain development by associating with actin cytoskeletal structures.
Area of Science:
- Neuroscience
- Genetics
- Cell Biology
Background:
- Neuronal circuit development relies on molecular and cellular cues.
- The cortical actin cytoskeleton is vital for neuromorphogenesis, but specific molecules remain understudied.
Purpose of the Study:
- To identify genes responsible for macrocephaly, neurodevelopmental delay, and seizures.
- To elucidate the role of specific molecules in human neuromorphogenesis.
Main Methods:
- Linkage analysis and whole-exome sequencing in Amish families.
- Immunofluorescence analysis of kaptin in primary neuronal cell cultures.
Main Results:
- Identified mutations in KPTN (kaptin) associated with a syndrome of macrocephaly, neurodevelopmental delay, and seizures.
- Demonstrated that kaptin associates with dynamic actin cytoskeletal structures.
- Showed that identified mutations disrupt kaptin's association with the actin cytoskeleton.
Conclusions:
- Kaptin alterations are responsible for macrocephaly and neurodevelopmental delay.
- Kaptin is a crucial molecule for normal human neuromorphogenesis.
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