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The rise and fall of billionaire siRNAs during reproductive development in rice [sRNA-seq]

ABSTRACT: The rise and fall of billionaire siRNAs during reproductive development in rice [sRNA-seq]

PROVIDER: PRJNA773748 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16533760.fastq.gz	Fastqsanger.gz
	SRR16533761.fastq.gz	Fastqsanger.gz
	SRR16533762.fastq.gz	Fastqsanger.gz
	SRR16533763.fastq.gz	Fastqsanger.gz
	SRR16533764.fastq.gz	Fastqsanger.gz

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Project description:RNA polymerase IV-dependent siRNAs, usually 24 nt in length, function in the RNAdirected DNA methylation that is responsible for de novo methylation in plants. We analyzed 24 nt siRNAs in inflorescences and found that among the 20,200 24 nt siRNA clusters, the top 0.81% highly expressed clusters accounted for more than 68% of the 24 nt siRNA reads in inflorescences. We named the highly expressed siRNAs as billionaire siRNAs (bill-siRNAs) and the less-expressed siRNAs as pauper siRNAs (pau-siRNAs). The bill-siRNAs in inflorescences are mainly derived from the ovary. Female gametes produced more bill-siRNAs than male gametes. In embryos and seedlings developed from fertilized egg cells, the bill-siRNAs from gametes disappeared. The endosperm, which develops from the fertilized central cell, also contained no bill-siRNAs from gametes but did contain newly and highly expressed siRNAs produced in different regions. In contrast, bill-siRNAs from the ovaries were maintained in the seed coat. The biosynthesis of bill-siRNAs in various tissues and cells is dependent on OsRDR2 (RNA-dependent RNA polymerase 2) and Pol IV (DNA-dependent RNA polymerase IV). Similar to the pau-siRNAs, the first base of bill-siRNAs is enriched at adenine, and bill-siRNAs can direct DNA methylation in various tissues.

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