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Evolutionary Relationships through Genome Comparisons

Evolutionary Relationships through Genome Comparisons

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...

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.

Multi-species Conserved Sequences

Multi-species Conserved Sequences

Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...

Genomics

Genomics

Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...

Next-generation Sequencing

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.

RNA-seq

RNA-seq

RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases.
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...

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Single Cell Multiplex Reverse Transcription Polymerase Chain Reaction After Patch-clamp

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Initial sequence and comparative analysis of the cat genome.

Joan U Pontius¹, James C Mullikin, Douglas R Smith

¹Laboratory of Genomic Diversity, SAIC-Frederick, Inc., NCI-Frederick, Frederick, Maryland 21702, USA. Pontiusj@ncifcrf.gov

Genome Research

|November 3, 2007

Summary

The domestic cat genome was sequenced and annotated using a comparative approach with other mammals. This provides insights into feline gene evolution and applications for cat genetic research.

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Area of Science:

Genomics
Comparative Genomics
Mammalian Evolution

Background:

The domestic cat (Felis catus) genome is crucial for understanding feline biology and evolution.
Comparative genomics aids in annotating novel genomes by leveraging existing data from related species.

Purpose of the Study:

To assemble, map, and annotate the genome sequence of an inbred Abyssinian domestic cat.
To identify feline gene orthologs, conserved sequence blocks, and other genomic features.
To explore mammalian genome evolution using a comparative approach.

Main Methods:

Genome sequencing of an inbred Abyssinian domestic cat to 1.9-fold coverage.
Comparative analysis with annotated genome assemblies of six mammals (human, chimpanzee, mouse, rat, dog, cow).
Identification and annotation of contigs, gene orthologs, conserved sequence blocks, repetitive elements, and genetic variations.

Main Results:

Resolved chromosomal positions for 663,480 contigs and 20,285 putative feline gene orthologs.
Identified 133,499 conserved sequence blocks (CSBs) and annotated repetitive elements, retroviral sequences, numt sequences, micro-RNAs, and evolutionary breakpoints.
Characterized numerous single nucleotide polymorphisms (SNPs), deletion insertion polymorphisms (DIPs), and short tandem repeats (STRs) within homozygous chromosomal regions.
Despite low coverage (approx. 65% of euchromatin), the comparative approach yielded informative genomic annotations.

Conclusions:

The comparative genomic analysis provides valuable insights into mammalian gene and genome evolution.
The annotated cat genome sequence offers significant potential for future feline research applications.
A comparative strategy with deeply sequenced mammals enables preliminary annotation of low-coverage genomes.