[Polymorphism analysis of porcine myogenin gene by PCR-RFLP].

Lin WH ，Gao J ，Chen KF ，Ding NS ，Ai HS ，Guo YM ，Li L ，Huang LS ... -  《-》

[Research on genetic variation of heart fatty acid-binding protein gene in ten pig breeds].

The genetic variation of heart fatty acid-binding protein (H-FABP) gene in 561 pigs including Duroc, Landrace, Large Yorkshire, Nanchang white pig, Erhualian, Meishan, Yushan black pig, Leping spotted pig, Jinhua black head-hind pig and Shanggao black head-hind pig were detected by PCR-RFLP with Hinf I, Hae III and Msp I. The results showed as follows: (1) Nanchang white pig presented only HH genotype while other breeds varied at the Hinf I-RFLP site; (2) The exotic breeds including Duroc, Landrace, Large Yorkshire and the native breed Nanchang white pig were proved to be polymorphic while the five Chinese local breeds presented no variation at the Hae III-RFLP site; (3) Among the tested breeds only Duroc presented variation at the Msp I-RFLP site. It is noted that all the Chinese local breeds present as AADD--genotypes.

Lin WH ，Huang LS ，Ren J ，Deng SH ，Wang WJ ，Liu BS ，Zhou LH ，Chen CY ... -  《-》

Polymorphism of E. coli F18 receptor gene in different pig breeds.

Shi QS ，Huang SQ ，Liu XC ，He CQ ，Jiang J ... -  《-》

[Relationship Between Molecular Marker of Western Main Pig H-FABP Gene and IMF Content.].

By using 265 pigs from eight breeds including Duroc,Landrace,Large White,Neijiang,Rongchang,Hanjiang Black,Hanzhong White,Bamei and wild ones, the genetic variations of 5'-upstream region from and the second intron in porcine H-FABP gene were checked by PCR-RFLP molecular marker with HinfI, Hae III and MspI,and effect of H-FABP gene on IMF content was then analyzed by least square analysis.The results showed as follows:(1) 8 pig breeds and wild pig had polymorphism at Hinf I-RFLP site. In above detected breeds,large white,Bamei pig, Hanjiang Black,Hanzhong White pig breeds and wild pig presented low polymorphism while other breeds have mediate polymorphism;(2)Among the tested breeds only 4 Chinese local pig breeds had no polymorphism at the Hae III-RFLP and Msp I-RFLP sites,but Duroc,Landrace,Largewhite, Hanzhong White pig breeds and wild pig had polymorphism. Wild pig at the Hae III-RFLP , Landrace,Largewhite and wild pig at the Hae III-RFLP and Msp I-RFLP sites were low polymorphism,others were mediate polymorphism;(3) H-FABP gene increased IMF content significantly(p0.05). Genetic effect of H-FABP gene on IMF content were HH>Hh>hh,DD.

Pang WJ ，Sun SD ，Li Y ，Chen GD ，Yang GS ... -  《-》

Relationship among H-FABP gene polymorphism, intramuscular fat content, and adipocyte lipid droplet content in main pig breeds with different genotypes in western China.

H-FABP(Heart fatty acid-binding protein), a member of FABP family, plays an essential role in long-chain fatty acid uptake and metabolic homeostasis. Its role in pig intramuscular fat content remains poorly understood, especially in local pig breeds in western China. In this study, the genetic variations of 5'-upstream region and the second intron in porcine H-FABP gene were investigated by PCR-RFLP in 256 pigs including Duroc, Large White, Landrace, Neijiang, Rongchang, Bamei pig, Hanjiang Black, Hanzhong White, and the wild ones. The effect of H-FABP gene on the IMF content was analyzed by the least square method. Lipid droplet morphology and content in adipocytes cultured from pigs with different H-FABP genotypes, were studied by oil red O staining and a triglyceride assay kit. Results showed a Hinf I -RFLP in these eight pig breeds and wild pigs, among which Large white, Bamei pig, Hanjiang Black, Hanzhong White, and wild pigs presented with low polymorphism while the other breeds had intermediate polymorphism. There was no Hae III or Msp I -RFLPs in the four Chinese local pig breeds tested, but Duroc, Landrace, Large White, Hanzhong White and wild pig had polymorphism. Landrace, Large White and wild pigs had low levels of Hae III- and Msp I -RFLP, whereas others had intermediate polymorphism. H-FABP genotypes significantly affected the IMF content (P<0.05). The IMF content ordered by H-FABP genotypes were HH>Hh>hh, DD<Dd<dd, and AA<Aa<aa. The genetic effect values were 3.89, 3.42, 3.17, 2.27, 2.49, 2.91, 2.28, 2.70, and 2.95, respectively. Fat deposition in adipocytes was stronger in the HH, dd and aa genotypes than in others. The results suggest that porcine meat quality may be improved by increasing the frequency of genotype aa-dd-HH in pig breeds.

Pang WJ ，Bai L ，Yang GS 《-》