cDNA microarray를 이용하여 한우의 근육과 지방조직의 유전자 발현 패턴 분석 및 bovine customer cDNA chip 구성 연구 Construction of Ovine Customer cDNA Chip and Analysis of Gene Expression Patterns in the Muscle and Fat Tissues of Native Korean Cattle원문보기
소의 질을 평가하기 위해서는 중요한 인자인 근육내 지방(또는 마블링)을 조절하는 분자를 연구해야 한다. cDNA microarray를 사용하여 등지방 조직과 최장근의 유전자발현 차이를 비교하였다. 이 연구를 통해, 우리는 한우의 지방조직에 1211개, 근육조직에서 1346개의 특이 유전자를 확인하였다. bovine chip은 지방조직의 920개 유전자와 근육조직의 760개 유전자로 이루어진 1680개의 특이 유전자로 구성되어있다. 이 실험에서 Microarray 분석은 등지방조직(Cy3)과 최장근(Cy5)의 유전자 발현에 있어서 큰 차이를 보여준다. 차이를 보이는 많은 특이유전자 중에서, 12-리폭시게나아제 유전자와 프로스타글란딘 D 합성효소는 근육내 지방의 축적을 조절하는 중요한 효소이다. 본 연구에서, 일반적으로 발현되지만 한우의 근육과 지방 조직에서 차이를 보이는 많은 유전자를 hybridization 분석을 통해 발견하였다. 선택된 유전자의 발현 수준은 반정량적 RT-PCR을 통해 확인하였고, 그 결과는 cDNA microarray와 유사하였다.
소의 질을 평가하기 위해서는 중요한 인자인 근육내 지방(또는 마블링)을 조절하는 분자를 연구해야 한다. cDNA microarray를 사용하여 등지방 조직과 최장근의 유전자발현 차이를 비교하였다. 이 연구를 통해, 우리는 한우의 지방조직에 1211개, 근육조직에서 1346개의 특이 유전자를 확인하였다. bovine chip은 지방조직의 920개 유전자와 근육조직의 760개 유전자로 이루어진 1680개의 특이 유전자로 구성되어있다. 이 실험에서 Microarray 분석은 등지방조직(Cy3)과 최장근(Cy5)의 유전자 발현에 있어서 큰 차이를 보여준다. 차이를 보이는 많은 특이유전자 중에서, 12-리폭시게나아제 유전자와 프로스타글란딘 D 합성효소는 근육내 지방의 축적을 조절하는 중요한 효소이다. 본 연구에서, 일반적으로 발현되지만 한우의 근육과 지방 조직에서 차이를 보이는 많은 유전자를 hybridization 분석을 통해 발견하였다. 선택된 유전자의 발현 수준은 반정량적 RT-PCR을 통해 확인하였고, 그 결과는 cDNA microarray와 유사하였다.
To investigate the molecular events of controlling intramuscular fat (or marbling), which is an important factor in the evaluation of beef quality, we performed cDNA microarray analyses using the longissimus dorsi muscle and back fat tissues. For this study, we constructed normalized cDNA libraries:...
To investigate the molecular events of controlling intramuscular fat (or marbling), which is an important factor in the evaluation of beef quality, we performed cDNA microarray analyses using the longissimus dorsi muscle and back fat tissues. For this study, we constructed normalized cDNA libraries: fat tissues in native Korean cattle (displaying 1,211 specific genes), and muscle tissues in native Korean cattle (displaying 1,346 specific genes). A bovine cDNA chip was constructed with 1,680 specific genes, consisting of 760 genes from muscle tissues and 920 genes from fat tissues. The microarray analysis in this experiment showed a number of differentially expressed genes, which compared the longissimus dorsi muscle (Cy5) with back fat tissue (Cy3). Among many specific differentially expressed genes, 12-lipoxygenase (oxidizing esterified fatty acids) and prostaglandin D synthase (differentiation of fibroblasts to adipocytes) are the key candidate enzymes that should be involved in controlling the accumulation of intramuscular fat. In this study, differentially and commonly expressed genes in the muscle and fat tissues of native Korean cattle were found in large numbers, using the hybridization assay. The expression levels of the selected genes were confirmed by semi-quantitative RT-PCR, and the results were similar to those of the cDNA microarray.
To investigate the molecular events of controlling intramuscular fat (or marbling), which is an important factor in the evaluation of beef quality, we performed cDNA microarray analyses using the longissimus dorsi muscle and back fat tissues. For this study, we constructed normalized cDNA libraries: fat tissues in native Korean cattle (displaying 1,211 specific genes), and muscle tissues in native Korean cattle (displaying 1,346 specific genes). A bovine cDNA chip was constructed with 1,680 specific genes, consisting of 760 genes from muscle tissues and 920 genes from fat tissues. The microarray analysis in this experiment showed a number of differentially expressed genes, which compared the longissimus dorsi muscle (Cy5) with back fat tissue (Cy3). Among many specific differentially expressed genes, 12-lipoxygenase (oxidizing esterified fatty acids) and prostaglandin D synthase (differentiation of fibroblasts to adipocytes) are the key candidate enzymes that should be involved in controlling the accumulation of intramuscular fat. In this study, differentially and commonly expressed genes in the muscle and fat tissues of native Korean cattle were found in large numbers, using the hybridization assay. The expression levels of the selected genes were confirmed by semi-quantitative RT-PCR, and the results were similar to those of the cDNA microarray.
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대상 데이터
1, 680 selected clones from bovine fat tissue and 1, 500 clones from bovine muscle tissue were partially sequenced with ABI 377 or ABI 3700 automatic sequencers. Through homology searches of sequencing results in the Advanced BLAST search program, we have constructed cDNA library of native Korean cattle containing 1, 211 genes from fat tissue and 1, 346 genes from muscle tissue.
USA). Sequencing results were searched with other sequences on the Genbank by using the Advanced BLAST search program (http://www.ncbi.nlm.nih.gov/ BLAST/).
Gene expression monitored on a microarray and scatter plot between longissimus dorsi muscle and back fat tissue. The array contains 1, 680 specific bovine cDNAs and housekeeping genes (GAPDH and β-actin). Fluorescent scans represented in a pseudocolor scale correspond to expression levels.
The steers were slaughtered in accordance with standard Korean industry-practice guidelines for the ethical treatment of animals. The carcasses, with weights ranging from 550 to 600 kg, were dressed in a commercial slaughter- house. Longissimus dorsi muscles and back fat tissues were obtained from the eighth through the thirteenth thoracic rib sections.
With the selected clones, we carried out plasmid prepara- tion with 1, 680 clones for bovine fat tissue and 1,500 clones for bovine muscle tissue. We performed PCR to confirm the purity of plasmids with randomly selected clones.
성능/효과
1-B, 1, 346 cDNA clones were obtained from bovine mus- cle tissues. Based on sequencing analysis and BLAST search, 108 bovine genes (14%), 368 human ortholog genes (48%), 103 ortholog genes from other species (14%), 134 EST (18%), and 42 novel genes (6%) were identified. There are 42 novel genes that are waiting to be studied further.
This result suggests that prostaglanding D synthase is capa- ble of trans-differentiating muscle tissue into intramuscular fat. Based on these observations with supporting results from other studies, it is probable that differentially expressed 344 genes might be involved in muscle, lipid, or energy me- tabolism, signal transduction, antioxidant defencse, pro- liferation, differentiation, and transcription initiation.
In conclusion, the comparison of differential gene ex- pression in the fat and muscle tissues from native Korean cattle showed that a substantial number of genes were displayed. Certain genes were expressed to a high level in the designated tissue, as was expected.
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