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Chromosome 9 open reading frame 25 (C9orf25) is a domain that encodes the FAM219A gene. The terms FAM219A and C9orf25 are allieses and can be used interchangeably. The function of this gene is not yet understood.

Location
C9orf25 is located on the short arm of chromosome 9 at the 9p13.3 position. The gene is encoded on the sense strand (-) spanning the chromosomal locus from base pair 34,502,909 to 34,398,027.

Transcript Variants
In humans there are 8 main transcript variants of the FAM219A gene. All of these transcripts have varying lengths and splice sites. Only four of these transcripts encode for a protein product.

Orthologs
The C9orf25 gene has orthologs in a wide variety of Eukaryotic organisms, including invertebrates. This gene has not been found in plants, fungi or protists. C9orf25 is a slowly evolving gene and is highly conserved though out all of its known orthologs.

Paralogs
C9orf25 has a paralog FAM219B which is located on the long arm of chromosome 9 and is 198 amino acids long. The C9orf25 and FAM219B genes duplicated and diverged between 684 and 797 million years ago.

General Properties
The C9orf25 protein is composed of 185 amino acids. It has a molecular weight of 20.4 kilodaltons and an isoelectric point of 4.47. It is a member of the FAM219 super family. The entire protein is still considered to be a domain of unknown function.

Protein Localization
C9orf25 has no signal sequence and remains in the cytosol.

Conserved Motifs and Post-Translational Modifications
The following are experimental post-transitional modifications for the C9orf25 protein :


 * 6 predicted Serine phosphorylation sites
 * 1 predicted Tyrosine phosphorylation site
 * 1 predicted prenylation site



Secondary Structure
The secondary structure of the gene is predicted to have two stretches of alpha helices and one beta strand. The majority of the secondary structure of gene is random coils.

Expression
The C9orf25 gene has medium to high expression in most tissues of the body .The gene has particularly high expression in the nervous, digestive and male reproductive systems.

Interacting Proteins
The C9orf25 gene has many different interactions with a variety of other proteins that have an assortment of functions. The main ones that are listed on at least two reviewed sources are shown below.