# C2orf72

C2orf72 (Chromosome 2, Open Reading Frame 72) is a gene in humans (Homo sapiens) that encodes a protein currently named after its gene, C2orf72. It is also designated LOC257407 and can be found under GenBank accession code NM_001144994.2. The protein can be found under UniProt accession code A6NCS6.
This gene is primarily expressed in the liver, brain, placental, and small intestine tissues. C2orf72 is an intracellular protein that has been predicted to reside within the nucleus, cytosol, and plasma membrane of cells. The function of C2orf72 is unknown, but it is predicted to be involved in very-low-density lipoprotein particle assembly and also involved in the regulation of cholesterol esterification. This prediction also matches with the fact that both estradiol and testosterone have been reported to upregulate expression of C2orf72.

## Gene
### Locus

C2orf72 is a protein-coding gene found on the forward (+) strand of chromosome 2 at the locus 2q37.1, on the long arm of the chromosome.

### mRNA

C2orf72's mRNA transcript is reported to be about 3,629 base pairs long. It appears to have two polyadenylation sites near the 5′ end of the mRNA transcript, each preceded by their respective regulatory sequences, such as ATTAAA or AATAAA.
There are three predicted exons reported for human C2orf72.

### Expression pattern

C2orf72 is preferentially expressed in brain, liver, placenta, colon, small intestine, gallbladder, stomach, and prostate, and to a lesser extent in adrenal gland, appendix, pancreas, lung, kidney, testis, and urinary bladder.

### Predicted Biological Functions

It is predicted via Archs4 (July 16, 2022) that the function of this gene may be related to very-low-density lipoprotein particle assembly and also involved in the regulation of cholesterol esterification.

## Regulation
### Gene-level regulation
#### Gene perturbation data

In a study of embryonic liver samples lacking hepatocyte nuclear factor 4 alpha (HNF4α), the expression of C2orf72 was downregulated.
Both estradiol and testosterone upregulate expression of C2orf72.

#### Expression pattern

C2orf72 mRNA and protein products are found preferentially in the liver, kidney, and placenta. The protein is localized to the cell membrane and cytoplasm in liver, brain, and placental tissues.

### Transcript-level regulation

miR-1271-5p is a microRNA that could bind to the 3′ untranslated region of the C2orf72 mRNA transcript at 5′-...GUGCCAA...-3′.

### Protein-level regulation
#### Predicted phosphorylation sites

There are at least two predicted phosphorylation sites for the human C2orf72 protein, one at threonine-286 and the other at serine-294.

## Protein
### Human protein

The predicted molecular weight of C2orf72 is 30.5 kDa, and it has a predicted isoelectric point (pI) of pH 8.7.
There are eight cysteine residues, for a potential of four disulfide bonds. Most of the cysteine residues are positioned next to a polar amino acid (uncharged or positively or negatively charged).
At physiological pH, there are 33 positively charged amino acid residues, including histidine, most of which are arginines. Likewise, there are 33 negatively charged amino acid residues, most of which are glutamates.
There are 14 hydroxyl-containing residues (tyrosine, threonine or serine) that could serve as typical phosphorylation sites; most of these are serines.

## Interacting proteins

These proteins have been reported to interact with human C2orf72: RASN (GTPase NRas), RASK (GTPase KRas), and CD81.

## Homology

There are at least 203 organisms with an ortholog of C2orf72. The most evolutionarily distant reported ortholog of C2orf72 is in the Australian ghost shark (Callorhincus milii);, and it is broadly conserved from Actinopterygii (bony fish) to Mammalia.
Table 1. Examples of species reported to have C2orf72 orthologs :
| Genus and species | Common name | Order | Date of divergence from human (million years ago) | GenBank accession code | Sequence length | Sequence identity (%) | Sequence similarity (%) |
| Pan troglodytes | Chimpanzee | Primates | 6.7 | XP_516141.5 | 295 | 98.6 | 98.6 |
| Pongo abelii | Sumatran orangutan | Primates | 15.76 | XP_024099683.1 | 295 | 95.3 | 96.9 |
| Castor canadensis | American beaver | Rodentia | 90 | XP_020011841.1 | 282 | 77.6 | 82.4 |
| Oryx dammah | Scimitar-horned oryx | Artiodactyla | 96 | XP_040084064.1 | 285 | 74.6 | 79.3 |
| Sus scrofa | Wild boar | Artiodactyla | 96 | XP_005657646.1 | 282 | 75.3 | 80.7 |
| Tursiops truncatus | Common bottlenose dolphin | Cetacea | 96 | XP_033715450.1 | 285 | 76.9 | 80.7 |
| Felis catus | Domestic cat | Carnivora | 96 | XP_023115562.1 | 286 | 80.1 | 83.1 |
| Eptesicus fuscus | Big brown bat | Chiroptera | 96 | XP_027993078.1 | 151 | 36.1 | 38.9 |
| Corapipo altera | White-ruffed manakin | Passeriformes | 312 | XP_027503457.1 | 181 | 26.7 | 34.0 |
| Pipra filicauda | Wire-tailed manakin | Passeriformes | 312 | XP_027606890.1 | 243 | 34.7 | 45.2 |
| Taeniopygia guttata | Zebra finch | Passeriformes | 312 | XP_030136117.3 | 255 | 35.1 | 45.4 |
| Corvus cornix cornix | Hooded crow | Passeriformes | 312 | XP_039412719.1 | 245 | 36.0 | 45.3 |
| Hirundo rustica | Barn swallow | Passeriformes | 312 | XP_039930397.1 | 243 | 37.0 | 46.7 |
| Aythya fuligula | Tufted duck | Anseriformes | 312 | XP_032049188 | 251 | 36.3 | 46.7 |
| Anas platyrhynchos | Mallard | Anseriformes | 312 | XP_038039556.1 | 251 | 36.3 | 46.7 |
| Protobothrops mucrosquamatus | Brown-spotted pit viper | Squamata | 312 | XP_029139335.1 | 278 | 22.9 | 34.5 |
| Python bivittatus | Burmese python | Squamata | 312 | XP_025023716.1 | 279 | 23.3 | 35.9 |
| Pseudonaja textilis | Eastern brown snake | Squamata | 312 | XP_026577460.1 | 272 | 31.6 | 41.0 |
| Pantherophis guttatus | Corn snake | Squamata | 312 | XP_034263860.1 | 252 | 33.0 | 42.5 |
| Pogona vitticeps | Central bearded dragon | Squamata | 312 | XP_020657305.1 | 295 | 24.1 | 34.0 |
| Zootoca vivipara | Common lizard | Squamata | 312 | XP_034989711.1 | 285 | 37.9 | 48.6 |
| Lacerta agilis | Sand lizard | Squamata | 312 | XP_033004091.1 | 289 | 38.0 | 49.5 |
| Podarcis muralis | Common wall lizard | Squamata | 312 | XP_028587763.1 | 272 | 38.7 | 50.8 |
| Gopherus evgoodei | Goode's thornscrub tortoise | Testudines | 312 | XP_030431493.1 | 481 | 24.2 | 31.1 |
| Terrapene carolina triunguis | Three-toed box turtle | Testudines | 312 | XP_029766982.1 | 262 | 35.1 | 43.2 |
| Chrysemys picta bellii | Painted turtle | Testudines | 312 | XP_023966073.1 | 306 | 36.6 | 47.4 |
| Dermochelys coriacea | Leatherback sea turtle | Testudines | 312 | XP_038272534.1 | 271 | 38.1 | 48.1 |
| Mauremys reevesii | Reeves' turtle | Testudines | 312 | XP_039344659.1 | 277 | 39.5 | 51.4 |
| Nanorana parkeri | High Himalaya frog | Anura | 351.8 | XP_018432004.1 | 304 | 27.3 | 40.1 |
| Xenopus tropicalis | Tropical clawed frog | Anura | 351.8 | XP_002937397.3 | 289 | 30.7 | 42.4 |
| Rhinatrema bivittatum | Two-lined caecilian | Gymnophiona | 351.8 | XP_029473197.1 | 358 | 30.3 | 36.1 |
| Geotrypetes seraphini | Gaboon caecilian | Gymnophiona | 351.8 | XP_033814148.1 | 233 | 33.9 | 44.2 |
| Parambassis ranga | Indian glass fish | Perciformes | 435 | XP_028260036.1 | 334 | 19.7 | 34.5 |
| Acanthochromis polyacanthus | Spiny chromis | Perciformes | 435 | XP_022050415.1 | 317 | 21.8 | 35.6 |
| Acanthopagrus latus | Yellowfin seabream | Perciformes | 435 | XP_036971960.1 | 309 | 22.0 | 35.5 |
| Cyprinodon tularosa | White Sands pupfish | Cyprinodontiformes | 435 | XP_038147473.1 | 296 | 20.1 | 33.1 |
| Esox lucius | Northern pike | Esociformes | 435 | XP_012990404.1 | 332 | 20.6 | 33.1 |
| Thunnus maccoyii | Southern bluefin tuna | Scombriformes | 435 | XP_042273029.1 | 329 | 20.2 | 34.0 |
| Syngnathus acus | Greater pipefish | Syngnathiformes | 435 | XP_037106050.1 | 274 | 19.5 | 34.9 |
| Callorhinchus milii | Australian ghost shark | Chimaeriformes | 473 | XP_007887618.1 | 413 | 17.6 | 26.5 |