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Defects in courtship and vision caused by amino acid substitutions in a putative RNA-binding protein encoded by the no-on-transient A (nonA) gene of Drosophila

KG Rendahl, N Gaukhshteyn, DA Wheeler, TA Fry and JC Hall
Journal of Neuroscience 15 February 1996, 16 (4) 1511-1522; DOI: https://doi.org/10.1523/JNEUROSCI.16-04-01511.1996
KG Rendahl
Department of Biology, Brandeis University, Waltham, Massachusetts 02254, USA.
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N Gaukhshteyn
Department of Biology, Brandeis University, Waltham, Massachusetts 02254, USA.
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DA Wheeler
Department of Biology, Brandeis University, Waltham, Massachusetts 02254, USA.
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TA Fry
Department of Biology, Brandeis University, Waltham, Massachusetts 02254, USA.
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JC Hall
Department of Biology, Brandeis University, Waltham, Massachusetts 02254, USA.
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Abstract

The Drosophila no-on-transient A (nonA) gene is involved in the visual behaviors and courtship song of the fly. The NONA polypeptide contains two copies of the RNA-recognition motif (RRM), a hallmark of proteins involved in RNA binding, and an adjacent conserved charged region. This 311-amino-acid region is found in four other proteins and largely overlaps the Drosophila-Behavior/Human Splicing (or DBHS) domain. The newest family member, Drosophila nAhomo, was discovered in a database search, and encodes a protein with 80% identity to NONA. In this study, three nonA mutations generated by chemical mutagenesis were sequenced and found to fall within the conserved region. Site-directed mutagenesis of the two RRMs, and within a (conserved) charged region located C-terminal to them, was performed to determine the significance of these domains with respect to whole-organismal phenotypes. Behavior and viability were assessed in transformed flies, the genetic background of which lacks the nonA locus. Point mutations of amino acid 548 in the charged region confirmed the etiology of the nonAdiss courtship-song mutation and showed that a milder substitution at this site produced intermediate singing behavior, although it failed to rescue visual defects. Mutagenesis of the RRM1 domain resulted in effects on viability, vision, and courtship song. However, amino acid substitutions in RNP-II of RRM2 led to near-normal phenotypes, and the in vivo nonA mutations located in or near RRM2 caused visual defects only. Thus, we suggest that the first RRM could be important for all functions influenced by nonA, whereas the second RRM may be required primarily for normal vision.

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The Journal of Neuroscience: 16 (4)
Journal of Neuroscience
Vol. 16, Issue 4
15 Feb 1996
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Defects in courtship and vision caused by amino acid substitutions in a putative RNA-binding protein encoded by the no-on-transient A (nonA) gene of Drosophila
KG Rendahl, N Gaukhshteyn, DA Wheeler, TA Fry, JC Hall
Journal of Neuroscience 15 February 1996, 16 (4) 1511-1522; DOI: 10.1523/JNEUROSCI.16-04-01511.1996

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Defects in courtship and vision caused by amino acid substitutions in a putative RNA-binding protein encoded by the no-on-transient A (nonA) gene of Drosophila
KG Rendahl, N Gaukhshteyn, DA Wheeler, TA Fry, JC Hall
Journal of Neuroscience 15 February 1996, 16 (4) 1511-1522; DOI: 10.1523/JNEUROSCI.16-04-01511.1996
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