| ID | Sequence | Length | GC content |
|---|---|---|---|
| AAGUGACGCGAGGCUCUGCGGAGACCAGGAGUCAGACUGUAGGACGACC… | 1505 nt | 0.5654 | |
| AGUGUCCUGGUUACUGCAGCGGCAGCAACAGCAGGUCCUACUAUCGCCU… | 1411 nt | 0.5514 | |
| AAGUGACGCGAGGCUCUGCGGAGACCAGGAGUCAGACUGUAGGACGACC… | 1385 nt | 0.5603 | |
| AAGUGACGCGAGGCUCUGCGGAGACCAGGAGUCAGACUGUAGGACGACC… | 1476 nt | 0.5630 | |
| AAGUGACGCGAGGCUCUGCGGAGACCAGGAGUCAGACUGUAGGACGACC… | 1595 nt | 0.5680 | |
| AAGUGACGCGAGGCUCUGCGGAGACCAGGAGUCAGACUGUAGGACGACC… | 1495 nt | 0.5645 | |
| AAGUGACGCGAGGCUCUGCGGAGACCAGGAGUCAGACUGUAGGACGACC… | 1486 nt | 0.5666 |
This gene encodes a member of the hydroxymethylbilane synthase superfamily. The encoded protein is the third enzyme of the heme biosynthetic pathway and catalyzes the head to tail condensation of four porphobilinogen molecules into the linear hydroxymethylbilane. Mutations in this gene are associated with the autosomal dominant disease acute intermittent porphyria. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]
A study in human post-mortem brainstem tissue from SIDS and control cases identified the HMBS as a candidate reference gene for RT-qPCR normalization, where it was found to be the least stable gene with the highest average Cq value and high variability [El-Kashef et al. DOI:10.1007/S12024-015-9717-1]. A study in human post-mortem tissue identified hydroxymethylbilane synthase (HMBS) as one of the most stable endogenous reference genes for qPCR normalization in brain tissue, where it was stable alongside SDHA, and it was also among the four most stable genes in cardiac muscle [Koppelkamm et al. DOI:10.1007/S00414-010-0433-9]. A review of molecular methods for post-mortem interval estimation noted that HMBS was found to have relatively high transcript stability in post-mortem human tissue [Scrivano et al. DOI:10.1007/s00414-019-02125-x].