Journal
JOURNAL OF POULTRY SCIENCE
Volume 46, Issue 3, Pages 249-256Publisher
JAPAN POULTRY SCIENCE ASSOC
DOI: 10.2141/jpsa.46.249
Keywords
genotyping; growth hormone; growth hormone receptor; growth hormone resistance; sex-linked dwarf chicken
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Funding
- Ministry of Education. Culture, Sports, Science and Technology, Japan [18780211]
- Grants-in-Aid for Scientific Research [18780211] Funding Source: KAKEN
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Sex-linked dwarf (SLD) of White Leghorn (WL S23MA line, Okazaki station. Japan) and White Plymouth Rock (WPR 15 line, Hyogo station, Japan) strains were established from the MA line (WL) and 16 line (WPR) of a normal growing line, respectively. However, the responsible genes in the two lines of SLD chicken have not been identified. In this Study, we characterized the phenotypes and identified the responsible genes in the SLD chickens of these two strains. SLD chickens of both Strains showed low body weight, short tarsometatarsus length. and high blood growth hormone (GH) level compared with the normal growing lines. From these particular results. it was indicated that the SLID chickens might possess a defect in the growth hormone receptor (GHR). We identified two types of Mutations in the GHR gene ill each SLD chicken by Northern blot and polymerase chain reaction analyses. The S23MA line had a single base mutation ill the Splice donor Site of the exon 5/intron 5 oil the GHR gene, whereas the 15 line lacked a large part of exon 10 of the GHR R gene. which contained 27 highly conserved amino acids at the 3' end of the coding region and 3'-UTR. Furthermore. it was revealed that growth retardation was caused by reduction in food intake of the SLD chickens. These two genetically distinguishable lines of dwarf chickens would serve as all effective tool for analyzing novel GH function and GHR signal transduction in chicken.
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