Where the receptor is encoded, and the common variant that changes it

Published 26 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
The GHR gene on the short arm of chromosome 5 has ten exons, of which nine encode the 620-residue mature receptor: a large extracellular domain, a single membrane-spanning segment and a long cytoplasmic tail. A common variant, present in about half of Europeans, lacks exon 3 and produces a receptor missing 22 residues near the amino terminus. Dos Santos and colleagues reported in Nature Genetics in 2004 that children carrying it responded more to growth hormone; later studies have confirmed, qualified and sometimes failed to reproduce the effect.

The gene

Exon 2 encodes the signal peptide and the first residues; exons 3 to 7 the extracellular domain; exon 8 the membrane segment; exons 9 and 10 the cytoplasmic domain. Promoter regions upstream give tissue-specific expression, highest in liver. Inactivating mutations throughout cause Laron syndrome, with over seventy described.

The cytoplasmic tail carries the sites that recruit JAK2 and dock STAT5.

The exon 3 deletion

A retroviral insertion event in the primate lineage made exon 3 skippable, and in humans two alleles — full-length and deleted — circulate at roughly equal frequency. The deleted receptor binds hormone normally and signals somewhat more strongly in cell assays. The 2004 report found carriers grew faster on treatment; meta-analyses since find a small effect on average with much variation between studies.

It is one of the most studied pharmacogenetic variants in endocrinology, and the evidence remains mixed.

What this does not say

Anything about any use of the material in the pack. It describes the gene for the receptor the hormone acts on, and one of its variants, as the literature reports them.

Somatropin is supplied by REVIVE LAB UAE for laboratory research use only, with identity and purity documented for the batch. It is not for human or veterinary use, and no dosing, administration or protocol guidance is provided.

What it costs

FormatStrengthPriceAvailability
HGH Somatropin Pack24 mg (72 IU)AED 850In stock

Delivery is AED 40 flat and free on orders over AED 700. Payment is cash on delivery anywhere in the UAE, or USDT (TRC20) in advance, which takes 5% off the order total.

Frequently asked

The gene?

Exon 2 encodes the signal peptide and the first residues; exons 3 to 7 the extracellular domain; exon 8 the membrane segment; exons 9 and 10 the cytoplasmic domain. Promoter regions upstream give tissue-specific expression, highest in liver. Inactivating mutations throughout cause Laron syndrome, with over seventy described.

Does REVIVE LAB UAE provide dosing guidance?

No. REVIVE LAB UAE supplies research materials and provides no dosing, administration or protocol guidance of any kind. Every product is sold for laboratory research use only and is not for human or veterinary consumption.

How fast is delivery in the UAE?

Stock is held in Dubai. An order confirmed before 4 PM Dubai time is dispatched the same working day, reaching Dubai and Abu Dhabi the same day and the remaining emirates within 24 hours. Delivery is AED 40 flat and free over AED 700.

HGH Somatropin Pack — in stock, dispatched from Dubai
HPLC-verified, lot certificate on every carton, 24-hour delivery nationwide. Browse the catalogue → All peptides UAE

Related reading

Supplied for laboratory research use only. Not for human or veterinary consumption. REVIVE LAB UAE provides no dosing, administration or protocol guidance.