Chromosome 9 open reading frame 85, commonly known as C9orf85, is a protein in Homo sapiens encoded by the C9orf85 gene. The gene is located at 9q21.13.[1] When spliced, four different isoforms are formed. C9orf85 has a predicted molecular weight of 20.17 kdal. Isoelectric point was found to be 9.54. The function of the gene has not yet been confirmed, however it has been found to show high levels of expression in cells of high differentiation.[2]
The sequence for C9orf85 isoform 1 in Homo sapiens, derived from NCBI: MSSQKGNVARSRPQKHQNTFSFKNDKFDKSVQTKKINAKLHDGVCQRCKEVLEWRVKYSKYKPLSKPKKCVKCLQKTVKDSYHIMCRPCACELEVCAKCGKKEDIVIPWSLPLLPRLECSGRILAHHNLRLPCSSDSPAS ASRVAGTTGAHHHAQLIFVFLVEMGFHYVGQAGLELLTS
| 1[6] | 3821 | 179 | |
| 2[7] | 1185 | 157 | |
| 3[8] | 1316 | 138 | |
| 4[9] | 3707 | 69 |
The C9orf85 gene was found in all species type including vertebrate to bacteria. However no type of protist was found as an ortholog for the human gene except for plasmodium.
| Homo sapiens | Human | Chordata | 0 | NP_001351982 | 179 | 100% | 100% | |
| Meriones unguiculatus | Mongolian gerbil | Rodentia | 90 | XP_021514638 | 154 | 74% | 84% | |
| Gallus gallus | Chicken | Chordata | 312 | XP_001233821 | 166 | 78.70% | 60% | |
| Terrapene carolina triunguis | Three-toed box turtle | Chordata | 312 | XP_024066792 | 171 | 85.45% | 61% | |
| Chelonia mydas | Green sea turtle | Chordata | 312 | XP_007065676 | 178 | 84.31% | 61% | |
| Calidris pugnax | Ruff bird | Chordata | 312 | XP_014813985 | 166 | 77.78% | 60% | |
| Microcaecilia unicolor | Tiny cayenne caecilian | Chordata | 351.8 | XP_030049723 | 178 | 76.15% | 60% | |
| Xenopus tropicalis | Western clawed frog | Chordata | 351.8 | KAE8633085 | 133 | 78.18% | 61% | |
| Electrophorus electricus | Electric eel | Chordata | 435 | XP_026886158 | 156 | 55.13% | 87% | |
| Oncorhynchus mykiss | Rainbow trout | Chordata | 435 | XP_021461156 | 177 | 60.77% | 72% | |
| Acanthaster planci | Crown-of-thorns starfish | Echinodermata | 684 | XP_022096254 | 197 | 56.76% | 62% | |
| Photinus pyralis | Big dipper firefly | Arthropoda | 797 | XP_031346726 | 183 | 58.04% | 62% | |
| Pomacea canaliculata | Golden apple snail | Mollusca | 797 | XP_025077101 | 208 | 47.33% | 73% | |
| Drosophila melanogaster | Fruit Fly | Arthropoda | 797 | NP_573209 | 234 | 49.58% | 65% | |
| Acropora millepora | Coral | Cnidaria | 824 | XP_029187517 | 190 | 57.14% | 62% | |
| Salpingoeca rosetta | Choanoflagellate | Choanoflagellate | 1023 | XP_004995700 | 286 | 41.67% | 60% | |
| Apophysomyces ossiformis | Fungi | Mucoromycota | 1105 | KAF7725139 | 181 | 40% | 72% | |
| Ricinus communis | Caster oil plant | Spermatophyta | 1496 | XP_002530997 | 227 | 34.21% | 78% | |
| Plasmodium ovale wallikeri | Malarian protist | Apicomplexa | 1768 | SBT56954 | 680 | 68.75% | 17% | |
| Bacillus cereus | Bacteria | Firmicutes | 4290 | KXI72539 | 83 | 73.61% | 39% |
| CCDC198 | XP_005267863 | 290 | 44.38% | 89% | Chromosome 14 | |
| Retbidin | EAW84316 | 224 | 60% | 51% | Chromosome 19 | |
| hCG2038446 | EAX11460 | 135 | 68.54% | 49% | Chromosome 2 | |
| hCG1820974 | EAW94215 | 143 | 72.58% | 41% | Chromosome 17 | |
| O-phosphoseryl-tRNA(Sec) selenium transferase isoform X1 | XP_016863766 | 586 | 70.67% | 41% | Chromosome 4 |
A rate of divergence can be calculated using the molecular clock hypothesis. As observed by the graph, C9orf85 lies between Cytochrome C and Fibrinogen Alpha with a slope leaning more towards Cytochrome C. Therefore, C9orf85 is possibly evolving at a slower rate than most proteins.
A multiple sequence alignment (MSA)[11] was done between the top 15 closely related orthologs to the Homo sapiens C9orf85. 20 amino acids were discovered to be conserved among all 15 sequences at the beginning of the protein sequence; within the first three exons.
In a MSA between distantly related homologs, 5 amino acids were observed to be conserved between exons two and three.
Yet, when running a multiple sequence alignment between Homo sapiens and the extremely distant Bacillus cereus, 53 amino acids are observed to be conserved primarily in the fourth exon.
The amino acid cysteine appears the most throughout the protein sequence as a conserved amino acids; 8 out of 20 instances. Cysteine 48, 70, 89, 96, and Tryptophan 54 are amino acids conserved in all species type – including vertebrate, invertebrate, fungi, plants, and protists – besides bacteria.
Using the Statistical Analysis of Protein Sequences tool,[12] SAPS, 5 spacings of cysteine were found. Four with the pattern of C-X-X-C—at amino acids 45, 70, 86, and 96—and the fifth spacing at amino acid 89 (CAC). The C-X-X-C pattern is known to be present in metal-binding proteins and oxidoreductases.[13] Additionally, three of the five cysteine spacings were also the top conserved amino acids throughout the most closely related orthologs; C70, C89, and C96.
C9orf85 has been found to be expressed highly in epithelial cells.[14] of the pancreas.[15] Additionally, high levels of expression have been established in the urinary bladder and thymus of the adult human, while expression levels were significant in the intestine of a 20-week-old fetus.
k-NN results predict C9orf85 to be 78.3% nuclear, 8.7% mitochondrial, 8.7% cytoplasmic, and 4.3% vacuolar.[16]
C9orf85 has 3 predicted promoters for the gene.[17] The choice promoter was GXG_18858 on the plus strand. Chosen for its large quantity of CAGE tags and its position being furthest upstream. Its start position is 71909780 and its end position is 71911841. It includes 2062 base pairs and has 13 transcripts. The last 500 base pairs of the double stranded promoter is featured below: 5' GCAGGAGGCGGGGATTGCGGAAAAGAAGAACCAATAGGAACAAAGGTTCC 3' 3' CGTCCTCCGCCCCTAACGCCTTTTCTTCTTGGTTATCCTTGTTTCCAAGG 5'
5' CCGCCCCTTTGATTTGATGGACTACACATTCGGGCCAATGGGGGAATTCT 3' 3' GGCGGGGAAACTAAACTACCTGATGTGTAAGCCCGGTTACCCCCTTAAGA 5'
5' CATTTCGAAGAAAGTGGGACTTGTTCTCCGGGTTTGAGAAAGAGGCTGCG 3' 3' GTAAAGCTTCTTTCACCCTGAACAAGAGGCCCAAACTCTTTCTCCGACGC 5'
5' CGGAGCCGGAGGGGTCGAGGCTGCGCCGCGTGGAGTGGCTTGGCTTAACA 3' 3' GCCTCGGCCTCCCCAGCTCCGACGCGGCGCACCTCACCGAACCGAATTGT 5'
5' GCAGGGAGGGCAGAGCGATGCTCTTTGACCTCCCAGAAGAGTCACGTGGG 3' 3' CGTCCCTCCCGTCTCGCTACGAGAAACTGGAGGGTCTTCTCAGTGCACCC 5'
5' CTGACCCAGAGCCGGGGCGGAAAGGCTGCGTTTGTTTCTTCCGGGTCATT 3' 3' GACTGGGTCTCGGCCCCGCCTTTCCGACGCAAACAAAGAAGGCCCAGTAA 5'
5' GACAGAAGCGTCAATTCCTGGGAGTAGTTCGTTGGTTTTCTTTCCCCTCA 3' 3' CTGTCTTCGCAGTTAAGGACCCTCATCAAGCAACCAAAAGAAAGGGGAGT 5'
5' TCCTTTTGCCTGCTCCCGGCGAGGGGTGGCTTTGATTTCGGCGATGAGCT 3' 3' AGGAAAACGGACGAGGGCCGCTCCCCACCGAAACTAAAGCCGCTACTCGA 5'
5' CCCAGAAAGGCAACGTGGCTCGTTCCAGACCTCAGAAGCACCAGAATACG 3' 3' GGGTCTTTCCGTTGCACCGAGCAAGGTCTGGAGTCTTCGTGGTCTTATGC 5'
5' TTTAGCTTCAAAAATGACAAGTTCGATAAAAGTGTGCAGACCAAGGTAGG 3' 3' AAATCGAAGTTTTTACTGTTCAAGCTATTTTCACACGTCTGGTTCCATCC 5'
| CLOX | Transcriptional repressor CDP | 0.962 | |
| KLFS | Gut-enriched Krueppel-like factor | 1.000 | |
| CAAT | Nuclear factor Y (Y-box binding factor) | 0.940 | |
| HIFF | Aryl hydrocarbon receptor nuclear translocator-like, homodimer | 1.000 | |
| MZF1 | Myeloid zinc finger protein | 0.992 | |
| STAT | STAT5: signal transducer and activator of transcription 5 | 0.944 | |
| ETSF | ETS-like gene 1 (ELK-1) | 0.958 | |
| CREB | Tax/CREB complex | 0.834 | |
| P53F | Tumor suppressor p53 (3' half site) | 0.921 | |
| TCFF | TCF11/LCP-F1/Nrf1 homodimers | 1.000 | |
| FKHD | Fork head homologous X binds DNA with a dual sequence specificity (FHXA and FHXB) | 0.870 | |
| MIRF | Zinc finger protein 768 | 0.819 | |
| BCL6 | B-cell CLL/lymphoma 6, member B (BCL6B) | 0.878 | |
| AP2F | Transcription factor AP-2, alpha | 0.931 | |
| EBOX | MYC associated factor X | 0.926 | |
| GCMF | Glial cells missing homolog 1, chorion-specific transcription factor GCMa | 0.942 |
Though there is a presence of hydrophobic regions in the protein sequence,[19] [20] there have been no confirmed transmembrane domains present[21]
A protein kinase C phosphorylation site is predicted at amino acid 3-5.[22] There is also a possible CK2 phosphorylation site at amino acid 77-80
There is one predicted SUMO site at position 23.[23] The result is significant with a p-value of 0.041.
Through the level of expression in various tissue samples, the C9orf85 protein is a regulated gene rather than a constitutive gene.
Additionally, urinary bladder epithelial cells function by altering the immune system of an infection.[24] The thymus is a primary lymphoid organ of the immune system, composed of T cells and epithelial cells. Research has found that the thymus has an increasing role in the development of intestinal immunity[25] Both are an element of the immune system, designed to ensure proper function of the immune system.