Variation in the chickenLPIN2gene and association with performance traits

Abstract

The objective of the study was to investigate the distribution of LPIN2 variants and haplotypes among breeds and perform an association analysis of the variants and haplotypes with the broiler traits in chickens. Six breeds were used to study the variation and distribution of chicken LPIN2, and an F2 resource population was used to measure growth traits, carcass traits, meat quality traits and serum biochemistry parameters. A c.-599G>A variant was located in the promoter region of LPIN2 and c.444G>A and c.1730A>T (E577D) coding variant mutations were detected. Linkage disequilibrium tests showed that these three variants were under moderate linkage disequilibrium in the 6 breeds and 7 haplotypes were constructed. The distribution of variation/haplotypes presented clear differences among breeds. Association analysis showed that c.-599G>A was associated with leg muscle weight, jejunum length, ileum length, leg muscle fibre density and leg muscle fibre diameter; c.444G>A was associated with spleen weight, ileum length, body weight at hatch and metatarsus length at 8 weeks; c.1730T>A had significant effects on chicken liver weight, heart weight, body weight at 10 weeks, serum albumin and glucose. Diplotypes were significantly associated with body weight at hatch, heart weight, pancreas weight, duodenum length, leg muscle fibre density and lactate dehydrogenase.

Genome-wide association study of 17 serum biochemical indicators in a chicken F2 resource population

“…A previous study has mapped GLU traits elsewhere on GGA17 [25]. In addition, a total of 23 QTLs on different chromosomes have been associated with GLU levels in studies based on different experimental designs [13,[25][26][27][28][29][30]. For example, Hee-Bok Park et al performed QTL analysis on an F2 population with 874 individuals composing 75 full-sib families and found that one QTL on GGA20 at the 41 Mb site and one QTL on GGA27 at the 21 Mb site were related to the GLU trait [28].…”