Let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickens

<p>Abstract</p> <p>Background</p> <p>A deletion mutation in the growth hormone receptor (<it>GHR</it>) gene results in the inhibition of skeletal muscle growth and fat deposition in dwarf chickens. We used microarray techniques to determine microRNA (miRNA)...

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Main Authors: Lin Shumao, Li Hongmei, Mu Heping, Luo Wen, Li Ying, Jia Xinzheng, Wang Sibing, Jia Xiaolu, Nie Qinghua, Li Yugu, Zhang Xiquan
Format: Article
Language:English
Published: BMC 2012-07-01
Series:BMC Genomics
Online Access:http://www.biomedcentral.com/1471-2164/13/306
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spelling doaj-a4340b1dcbe64ea3ba6f95961e210dee2020-11-25T02:00:58ZengBMCBMC Genomics1471-21642012-07-0113130610.1186/1471-2164-13-306Let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickensLin ShumaoLi HongmeiMu HepingLuo WenLi YingJia XinzhengWang SibingJia XiaoluNie QinghuaLi YuguZhang Xiquan<p>Abstract</p> <p>Background</p> <p>A deletion mutation in the growth hormone receptor (<it>GHR</it>) gene results in the inhibition of skeletal muscle growth and fat deposition in dwarf chickens. We used microarray techniques to determine microRNA (miRNA) and mRNA expression profiles of <it>GHR</it> in the skeletal muscles of 14-day-old embryos as well as 7-week-old deletion-type dwarf and normal-type chickens. Our aim was to elucidate the miRNA regulation of <it>GHR</it> expression with respect to growth inhibition and fat deposition.</p> <p>Results</p> <p>At the same developmental stages, different expression profiles in skeletal muscles of dwarf and normal chickens occurred for four miRNAs (miR-1623, miR-181b, let-7b, and miR-128). At different developmental stages, there was a significant difference in the expression profiles of a greater number of miRNAs. Eleven miRNAs were up-regulated and 18 down-regulated in the 7-week-old dwarf chickens when compared with profiles in 14-day-old embryos. In 7-week-old normal chickens, seven miRNAs were up-regulated and nine down-regulated compared with those in 14-day-old embryos. In skeletal muscles, 22 genes were up-regulated and 33 down-regulated in 14-day-old embryos compared with 7-week-old dwarf chickens. Sixty-five mRNAs were up-regulated and 108 down-regulated in 14-day-old embryos as compared with 7-week-old normal chickens. Thirty-four differentially expressed miRNAs were grouped into 18 categories based on overlapping seed and target sequences. Only let-7b was found to be complementary to its target in the 3′ untranslated region of <it>GHR</it>, and was able to inhibit its expression. Kyoto Encyclopedia of Genes and Genomes pathway analysis and quantitative polymerase chain reactions indicated there were three main signaling pathways regulating skeletal muscle growth and fat deposition of chickens. These were influenced by let-7b-regulated <it>GHR</it>. Suppression of the cytokine signaling 3 (<it>SOCS3</it>) gene was found to be involved in the signaling pathway of adipocytokines.</p> <p>Conclusions</p> <p>There is a critical miRNA, let-7b, involved in the regulation of <it>GHR</it>. <it>SOCS3</it> plays a critical role in regulating skeletal muscle growth and fat deposition <it>via</it> let-7b-mediated <it>GHR</it> expression.</p> http://www.biomedcentral.com/1471-2164/13/306
collection DOAJ
language English
format Article
sources DOAJ
author Lin Shumao
Li Hongmei
Mu Heping
Luo Wen
Li Ying
Jia Xinzheng
Wang Sibing
Jia Xiaolu
Nie Qinghua
Li Yugu
Zhang Xiquan
spellingShingle Lin Shumao
Li Hongmei
Mu Heping
Luo Wen
Li Ying
Jia Xinzheng
Wang Sibing
Jia Xiaolu
Nie Qinghua
Li Yugu
Zhang Xiquan
Let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickens
BMC Genomics
author_facet Lin Shumao
Li Hongmei
Mu Heping
Luo Wen
Li Ying
Jia Xinzheng
Wang Sibing
Jia Xiaolu
Nie Qinghua
Li Yugu
Zhang Xiquan
author_sort Lin Shumao
title Let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickens
title_short Let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickens
title_full Let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickens
title_fullStr Let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickens
title_full_unstemmed Let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickens
title_sort let-7b regulates the expression of the growth hormone receptor gene in deletion-type dwarf chickens
publisher BMC
series BMC Genomics
issn 1471-2164
publishDate 2012-07-01
description <p>Abstract</p> <p>Background</p> <p>A deletion mutation in the growth hormone receptor (<it>GHR</it>) gene results in the inhibition of skeletal muscle growth and fat deposition in dwarf chickens. We used microarray techniques to determine microRNA (miRNA) and mRNA expression profiles of <it>GHR</it> in the skeletal muscles of 14-day-old embryos as well as 7-week-old deletion-type dwarf and normal-type chickens. Our aim was to elucidate the miRNA regulation of <it>GHR</it> expression with respect to growth inhibition and fat deposition.</p> <p>Results</p> <p>At the same developmental stages, different expression profiles in skeletal muscles of dwarf and normal chickens occurred for four miRNAs (miR-1623, miR-181b, let-7b, and miR-128). At different developmental stages, there was a significant difference in the expression profiles of a greater number of miRNAs. Eleven miRNAs were up-regulated and 18 down-regulated in the 7-week-old dwarf chickens when compared with profiles in 14-day-old embryos. In 7-week-old normal chickens, seven miRNAs were up-regulated and nine down-regulated compared with those in 14-day-old embryos. In skeletal muscles, 22 genes were up-regulated and 33 down-regulated in 14-day-old embryos compared with 7-week-old dwarf chickens. Sixty-five mRNAs were up-regulated and 108 down-regulated in 14-day-old embryos as compared with 7-week-old normal chickens. Thirty-four differentially expressed miRNAs were grouped into 18 categories based on overlapping seed and target sequences. Only let-7b was found to be complementary to its target in the 3′ untranslated region of <it>GHR</it>, and was able to inhibit its expression. Kyoto Encyclopedia of Genes and Genomes pathway analysis and quantitative polymerase chain reactions indicated there were three main signaling pathways regulating skeletal muscle growth and fat deposition of chickens. These were influenced by let-7b-regulated <it>GHR</it>. Suppression of the cytokine signaling 3 (<it>SOCS3</it>) gene was found to be involved in the signaling pathway of adipocytokines.</p> <p>Conclusions</p> <p>There is a critical miRNA, let-7b, involved in the regulation of <it>GHR</it>. <it>SOCS3</it> plays a critical role in regulating skeletal muscle growth and fat deposition <it>via</it> let-7b-mediated <it>GHR</it> expression.</p>
url http://www.biomedcentral.com/1471-2164/13/306
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