A missense mutation in the GHR gene of Cornell sex-linked dwarf chickens does not abolish serum GH binding
in Journal of EndocrinologySearch for other papers by KL Hull in
Current site
Google Scholar
PubMed
Search for other papers by JA Marsh in
Current site
Google Scholar
PubMed
Search for other papers by S Harvey in
Current site
Google Scholar
PubMed
Sex-linked dwarfism (SLD) in chickens is characterized by impaired growth despite normal or supranormal plasma growth hormone (GH) levels. This resistance to GH action is thought to be due to mutations of the GH receptor (GHR) gene that reduce or prevent GH binding to target sites. The genetic lesion causing GH resistance in Cornell SLD chickens is, however, not known. Previous studies have shown that hepatic GH-binding activity is abnormally low in these birds, yet the GHR gene is transcribed into a transcript of appropriate size and abundance. Point mutations or defects in translation could therefore account for the impaired GHR activity in this strain. These possibilities were addressed in the present study. A missense mutation resulting in the substitution of serine for the conserved phenylalanine was identified in the region of the GHR cDNA encoding the extracellular domain. Translation of this mutant transcript was indicated by the presence of GHR/GH-binding protein (GHBP)-immunoreactive proteins in liver (55, 70 and 100 kDa) and serum (70 kDa) of normal (K) and SLD birds. Radiolabelled GH did not, however, bind to the hepatic membranes of most SLD chickens. Serum GH-binding activity, in contrast, was readily detectable, although at significantly lower levels than in normal birds. The missense mutation in the SLD GHR gene may thus affect targeting of GHRs to hepatic plasma membranes.
Journal of Endocrinology is committed to supporting researchers in demonstrating the impact of their articles published in the journal.
The two types of article metrics we measure are (i) more traditional full-text views and pdf downloads, and (ii) Altmetric data, which shows the wider impact of articles in a range of non-traditional sources, such as social media.
More information is on the Reasons to publish page.
| Sept 2018 onwards | Past Year | Past 30 Days | |
|---|---|---|---|
| Full Text Views | 549 | 389 | 11 |
| PDF Downloads | 139 | 68 | 1 |
Online ISSN: 1479-6805
Print ISSN: 0022-0795
Strengthening biomedical communities
to advance science and health
CONTACT US
Bioscientifica Ltd | Starling House | 1600 Bristol Parkway North | Bristol BS34 8YU | UK
Bioscientifica Ltd | Registered in England no 3190519