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Genome Annotation and Assembly

Genome Annotation and Assembly

The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.

Protein Complex Assembly

Protein Complex Assembly

Assembly of Complex Microtubule Structures

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.

Oligosaccharide Assembly

Oligosaccharide Assembly

Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...

Transgenic Plants

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Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...

Evolutionary Relationships through Genome Comparisons

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...

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Related Experiment Video

Updated: Aug 1, 2025

Transient Gene Expression in Tobacco using Gibson Assembly and the Gene Gun

Transient Gene Expression in Tobacco using Gibson Assembly and the Gene Gun

Published on: April 18, 2014

Recent Advances in Assembly of Complex Plant Genomes.

Weilong Kong¹, Yibin Wang¹, Shengcheng Zhang¹

¹Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China.

Genomics, Proteomics & Bioinformatics

|April 26, 2023

Summary

Advances in sequencing and computational methods are improving complex plant genome assembly. Future efforts aim for routine, accurate, and fully phased assemblies of plant genomes.

Keywords:

Assembly algorithm Complex plant genome Haplotype-resolved assembly Sequencing technology Telomere-to-telomere genome

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Last Updated: Aug 1, 2025

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Area of Science:

Genomics
Bioinformatics
Plant Science

Background:

Plant genomic research has advanced significantly due to new sequencing technologies and computational algorithms.
Hundreds of plant genomes have been decoded, but complex genomes remain challenging to assemble fully.

Purpose of the Study:

To summarize challenges and advances in complex plant genome assembly.
To provide an overview of experimental strategies, sequencing technology upgrades, assembly methods, and phasing algorithms.
To offer case studies for future complex genome projects.

Main Methods:

Review of current sequencing technologies and computational algorithms for genome assembly.
Analysis of experimental strategies for resolving complex plant genomes.
Evaluation of existing assembly and phasing methods.

Main Results:

Complex plant genomes present challenges like high heterozygosity, repetitive sequences, and high ploidy.
Progress has been made in sequencing technology and assembly algorithms.
Several complex plant genome projects provide valuable case studies.

Conclusions:

Accurate, gapless, telomere-to-telomere, and fully phased assembly of complex plant genomes is becoming increasingly feasible.
Continued advancements in technology and methods are expected to make complex genome assembly routine.
This review serves as a resource for tackling future complex plant genome challenges.