Assessment of milk quality using novel mutations of B2M gene in bovine DNA from milk

被引:8
作者
Liu, Yongfeng [1 ]
Liao, Jing [1 ]
Ku, Ting [1 ]
Li, Xiaoling [2 ]
Sheppard, Allan Michael [2 ]
机构
[1] Shaanxi Normal Univ, Coll Food Engn & Nutr Sci, Xian, Shaanxi, Peoples R China
[2] Univ Auckland, Liggins Inst, Auckland, New Zealand
基金
中国博士后科学基金;
关键词
Bovine DNA; B2M gene; mutations; milk quality; association; NEONATAL FC-RECEPTOR; INFORMATION-CONTENT; MAMMARY-GLAND; HUMAN GENOME; BETA-2-MICROGLOBULIN; ASSOCIATION; HETEROZYGOSITY; MICROGLOBULIN; DISEASE; MARKER;
D O I
10.1080/19476337.2017.1394367
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
This study investigated the expression of novel mutations of the 2-microglobulin (B2M) gene in bovine genomic DNA isolated from milk-borne leukocytes and tested the association of these mutations with milk quality traits in Holstein cows. DNA was extracted using a novel protocol allowing for the amplification of long fragments of DNA isolated from small amounts of unprocessed milk samples. Genomic mutations at the B2M locus were explored by DNA sequencing using specific primers and a cluster of five identified within a 729-bp region of intron 3. Specifically, mutations at 7008(G>T), 7202(A>G), 7432(G>T) and 7437(G>C) were all found to be significantly associated with milk protein percentage (P<0.05), and a mutation at 7026(G>A) was significantly associated with somatic cell count (P<0.05). The potential to use these mutations as further tools for the pre-evaluation of milk quality is discussed. RESUMENEl presente estudio investigo como se manifiestan mutaciones novedosas del gen 2-microglobulina en el ADN genomico bovino aislado de leucocitos transmitidos en la leche, a la vez que sometio a prueba la asociacion de dichas mutaciones con las caracteristicas de calidad de la leche obtenida de vacas Holstein. El ADN se extrajo utilizando un protocolo innovador que permite amplificar largos fragmentos del ADN aislados de pequenas cantidades de muestras de leche sin procesar. Se examinaron las mutaciones genomicas ocurridas en el locus del (B2M) mediante la secuenciacion del ADN, utilizando para ello partidores especificos y un cluster de cinco, identificados en una region de 729 bp del intron 3. Especificamente, se determino que las mutaciones en 7008 (G>T), 7202 (A>G), 7432 (G>T) y 7437 (G>C) se encuentran significativamente asociadas con el porcentaje de proteina lactea (MPP) (P<0,05), y que una mutacion en 7026 (G>A) se asocia de manera significativa con el conteo de celulas somaticas (SCC) (P<0,05). Para finalizar, se discute la posibilidad de usar estas mutaciones como herramientas adicionales para la preevaluacion de la calidad de la leche.
引用
收藏
页码:281 / 286
页数:6
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