Nmf9 Encodes a Highly Conserved Protein Important to Neurological Function in Mice and Flies

Area of Science:

• Neuroscience
• Genetics
• Evolutionary Biology

Background:

• Many genes lack functional annotation after genome sequencing.
• Understanding gene function is critical for biological context.

Purpose of the Study:

• To identify and characterize a novel protein-coding gene, Nmf9, involved in neurological functions.
• To investigate the evolutionary conservation and functional divergence of Nmf9 homologs.

Main Methods:

• Forward genetic screens using ENU-induced and genome-edited null mutations in mice.
• Analysis of behavioral phenotypes (vestibular function, fear learning, circadian behavior).
• Comparative genomics to identify and analyze homologous genes in other species (e.g., Drosophila).

Main Results:

• Nmf9 null mutations in mice cause deficits in vestibular function, fear learning, and circadian behavior.
• Nmf9 expression is localized to the inner ear, amygdala, and suprachiasmatic nuclei.
• Drosophila homolog (CG45058) null mutants exhibit severe locomotor defects and premature death; heterozygotes show altered sleep and activity.

Conclusions:

• Nmf9 represents a novel gene orthology group linked to specific neurological functions.
• The study demonstrates conserved requirement for Nmf9 homologs across a wide phylogenetic range.
• Significant structural changes in conserved domains suggest evolutionary adaptation of Nmf9 function.