Chromosome 9 open reading frame 25 (C9orf25) is a domain that encodes the FAM219A gene.[1] The terms FAM219A and C9orf25 are aliases and can be used interchangeably. The function of this gene is not yet completely understood.
In humans there are 8 main transcript variants of the FAM219A gene.[3] All of these transcripts have varying lengths and splice sites with transcript variant 1 being the longest and most abundant.[1][3] Only four of these transcripts encode for a protein product.[11]
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.[13] C9orf25 is a slowly evolving gene.[12] It is also highly conserved through 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.[14] The C9orf25 and FAM219B genes duplicated and diverged between 684 and 797 million years ago.
Protein
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.[15] It is a member of the FAM219 super family. The entire protein is still considered to be a domain of unknown function.
The C9orf25 gene has medium to high expression in most tissues of the body.[18] The gene has particularly high expression in the nervous, digestive and male reproductive systems.[19]
Interacting proteins
The C9orf25 gene has many different interactions with a variety of other proteins that have an assortment of functions.[20][21] The main ones that are listed on at least two reviewed sources are shown below.
The C9orf25 protein is associated with several disease causing proteins, however does not seem to be responsible for disease on its own.[2][11] The gene seems to have higher expression in metastatic cells.[18]
