Czech J. Anim. Sci., 2020, 65(5):182-191 | DOI: 10.17221/265/2019-CJAS

Frameshift mutation in myostatin gene by zinc-finger nucleases results in a significant increase in muscle mass in Meishan sowsOriginal Paper

Hanfang Bi1, Shanshan Xie1,3, Chunbo Cai1, Lili Qian2, Shengwang Jiang1, Gaojun Xiao1, Biao Li1, Xiang Li1, Wentao Cui*,1
1 Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
2 Institute for Translational Medicine, Qingdao University, Qingdao, P.R. China
3 Beijing Century Legend Bioscience Co., Ltd., Beijing, P.R. China

Myostatin (MSTN) is a negative regulator of skeletal muscle growth and development. A significant increase in skeletal muscle was observed in Mstn-/- mice compared with wild-type mice. So far, there has been no report on porcine MSTN mutations leading to skeletal muscle hypertrophy. In this report a MSTN frameshift mutation missing 11 nucleotides in exon 2 was introduced into Meishan pigs by zinc finger nuclease (ZFN) technology. ZFN-edited MSTN-/- Meishan pigs were successfully produced by a cloning method of somatic cell nucleus transfer. Results from slaughter experiments indicated that lean meat yield increased 16.53% in about 80 kg (10-months-old) MSTN-/- Meishan sows compared with their corresponding wild-type counterparts. The lean percentage of carcass from MSTN-/- sows was 61.20% vs 48.25% for MSTN+/- sows and 44.67% for wild-type sows. The fat of MSTN-/- sows was significantly lower than that of MSTN+/- and wild-type sows. The loin eye area of MSTN-/- Meishan sows (56.42 cm2) was greater than that of MSTN+/- (37.39 cm2) and wild-type (26.26 cm2) sows. The muscle fibre area of longissimus muscle in wild-type Meishan sows (1 946 μm2) was significantly greater than that of MSTN+/- (1 324 μm2) and MSTN-/- (1 419 μm2) sows. Moreover the significantly increased skeletal muscle in these MSTN-/- Meishan sows was mainly due to the increase in the number of myofibres rather than to hypertrophy. Compared with wild-type Meishan sows, it was noted that myofibres had transformed from type I to IIB in MSTN-/- Meishan sows. Our present study demonstrated that frameshift mutation in MSTN by ZFN technology led to a significant increase in muscle mass and a significant decrease in fat content in Meishan sows.

Keywords: MSTN; ZFN-edited; skeletal muscle; lean meat yield; myofibres

Published: May 31, 2020  Show citation

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Bi H, Xie S, Cai C, Qian L, Jiang S, Xiao G, et al.. Frameshift mutation in myostatin gene by zinc-finger nucleases results in a significant increase in muscle mass in Meishan sows. Czech J. Anim. Sci. 2020;65(5):182-191. doi: 10.17221/265/2019-CJAS.
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