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Day 6 - Dynasty asian challenge daily dynasty gate icon japanese logo red templeIn 2010, an Italian-led consortium announced they had sequenced the first complete genome of an apple in collaboration with horticultural genomicists at Washington State University, using ‘Golden Delicious’. The modern apple has 17 chromosomes which were found to be derived from an ancestor with 9 chromosomes that experienced genome-wide duplication. The apple genome has approximately 57,000 genes, which was the highest number of any plant genome studied at the time, and more genes than the human genome which has about 25,000 genes. In 2016 a new and much higher quality whole genome sequence (WGS) for a double-haploid derivative of the Golden Delicious variety of apple was published. The genome sequence also provided proof that Malus sieversii was the wild ancestor of the domestic apple-an issue that had been long-debated in the scientific community. This new understanding of the apple genome will help scientists identify genes and gene variants that contribute to resistance to disease and drought and other desirable characteristics. Genetic evidence has confirmed that MdMYB1, which regulates transcription of the anthocyanin biosynthesis pathway, is responsible for the red color in apples. Understanding the genes behind these characteristics will help scientists perform more knowledgeable selective breeding. Apple color is important when it comes to consumer preference, and red apples are generally preferred. An additional genome assembly of the Hanfu apple (HFTH1) was compared to the Golden Delicious (GDDH13) genome and showed extensive genomic variation largely due to transposable elements. The transcript levels of MdMYB1 and anthocyanin-related structural genes in the skins of Hanfu and Golden Delicious apples are significantly different. MdMYB1-1 is a single dominant allele controlling anthocyanin synthesis in apple skin. In non-red apples, the MdMYB1-2 and MdMYB1-3 alleles show a limited expression under intense light and low-temperature. MdMYB1 has at least three types of alleles (MdMYB1-1, MdMYB1-2, and MdMYB1-3). The coding region differences of these alleles do not have an impact on functionality, and scientists do not yet know the reason for the differences in expression levels in the MdMYB1 alleles. In Golden Delicious and Hanfu apples, the coding sequences of MdMYB1 were the same, but one Single nucleotide polymorphism (SNP) was found in the intron regions. Upstream of MdMYB1, 15 SNPs and five indels were identified. One of these indels is an LTR retrotransposon called redTE, located in the Hanfu apple genome upstream of MbMYB1. RedTE has identical flanking LTRs which means it was a more recent insertion. These indels were very different between the two types of apples. Many red and non-red apples were tested, and redTE was identified in all of the red apples and none of the non-red apples, meaning that redTE may be responsible for the red color of apples. Zhang, L.; Hu, J.; Han, X. (2019). “A high-quality apple genome assembly reveals the association of a retrotransposon and red fruit colour”. Nature Communications. 10 (1): 1494. Bibcode:2019NatCo..10.1494Z. Daccord, N.; Celton, J.; Linsmith, G. (2017). “High-quality de novo assembly of the apple genome and methylome dynamics of early fruit development”. Nature Genetics. 49 (7): 1099-1106. doi:10.1038/ng.3886. This page was last edited on 8 September 2024, at 05:36 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.

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