Abstract
<p class="1Body">DNA methylation is known to play an important role in the regulation of gene expression in eukaryotes. In this study, the author assessed the extent and pattern of cytosine methylation in the <em>Scapharca broughtonii</em> genome using the technique of methylation-sensitive amplified polymorphism (MSAP).The results showed that, DNA methylation rate was negatively related to the shell length, the gross weight and the weight of soft body, but positively related to the shell broadness and the shell height; there was significantly different between the parents and the offspring: 31.6% of 5'-CCGG sites in the <em>Patinopecten yessoensis</em> of Korean populations genome were cytosine methylated, and in the <em>Patinopecten yessoensis</em> of Chinese populations were 33%, the methylation rates of F1 was 29.98%; four classes of patterns were identified in a comparative assay of cytosine methylation in the parents and hybrid, increased methylation was detected in the hybrid compared to the parents at some of the recognition sites, while decreased methylation in the hybrid was detected at other sites. It indicated that the alteration of methylation resulted from cross-breeding, and the inbreeding did not change the methylation ratio and patterns; The DNA cytosine methylation has a relationship with the heterosis.</p>
Highlights
Scapharca broughtonii (Mollusca, Bivalve, Arcoida), one of the most important marine commerical bivalve species, mainly distributes in the coasts of BoHai Sea and North of Yellow Sea, China
It indicated that DNA methylation affected on the shell length, the gross weight and the weight of soft body, DNA methylation may play an important part during the growth and development of the organisms, in the aspect of survival rate it has a different effect on Chinese and Korean populations
The methylation sensitive amplified polymorphism (MSAP) technique has been used in various studies on cytosine methylation, and has proven to be a powerful tool for investigating DNA methylation
Summary
Scapharca broughtonii (Mollusca, Bivalve, Arcoida), one of the most important marine commerical bivalve species, mainly distributes in the coasts of BoHai Sea and North of Yellow Sea, China. Because of its large body, rapid growth rate, delicious tastes and high protein and vitamin contents, the export in the exchange rates of ark shell is higher in the aquatic products, and Scapharca broughtonii has become one of the most popular farming mollusks in North China due to its high economic value in recent years. With the deterioration of marine ecological environment resulted from the extended farming scale and frequency human activities in coastal waters, and over-fishing, the wild resources decreased. It is imperative for us to actively manage the resource and turn to breed high adversity resistance, fast-growing variety using traditional and new breeding methods. The hybridization of different populations proved to be a good way of breeding
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