In molecular biology, Sphinx (spx) is a long non-coding RNA found in Drosophila.
It is expressed in the brain, within the antennal lobe and inner antennocerebral tract.
Sphinx may act as a negative regulator of target genes.
[1][2] It is a chimeric gene, originating from a retroposed sequence of the ATP synthase chain F gene from chromosome 2 to chromosome 4.
Nearby sequences were recruited to form an intron and an exon of this chimeric gene.