Molecular Evolution. Study of how genes and proteins evolve and how are organisms related based on their DNA sequence Molecular evolution therefore is.

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Presentation transcript:

Molecular Evolution

Study of how genes and proteins evolve and how are organisms related based on their DNA sequence Molecular evolution therefore is the determination and comparative study of DNA and deduced amino acid sequences. Sequences from different organisms or populations are matched or aligned

DNA sequence alignment of some of the sequence of the Human and mouse PDGF receptor agacctcaaaaggtgtccacgtgagctgccgcccacgctgctggggaacagttccgaaga ||||||||||||||||||||| | ||| | ||||| | ||||||| |||||| | || agacctcaaaaggtgtccacgaaaactgtcacccacacccttggggaatagttccaagga ggagagccagctggagactaacgtgacgtactgggaggaggagcaggagtttgaggtggt |||||||||||| || || || ||||| | ||||||||| || ||||| | |||||||| ggagagccagctagaaacgaatgtgactttctgggaggaagatcaggaatacgaggtggt gagcacactgcgtctgcagcacgtggatcggccactgtcggtgcgctgcacgctgcgcaa |||||||||||| |||| |||||||||| ||||||||| || ||||||| ||||| || gagcacactgcgcctgcgccacgtggatcagccactgtccgtacgctgcatgctgcagaa cgctgtgggccaggacacgcaggaggtcatcgtggtgccacactccttgccctttaaggt | | |||| || |||||||||||| |||||| ||||| ||||||||||| || || ctccatgggtggagattcgcaggaggtcaccgtggtcccacattccttgcccttcaaagt ggtggtgatctcagccatcctggccctggtggtgctcaccatcatctcccttatcatcct ||||||||||||||||||||||||| | ||||| || ||| ||||||| || |||||||| ggtggtgatctcagccatcctggccttagtggtccttaccgtcatctctctcatcatcct

Comparison of some of the amino acid sequence from Human and mouse PDGF receptors. Note indels. LKRCPRELPPTLLGNSSEEESQLETNVTYWEEEQEFEVVSTLRLQHVDRPLSVRCTLRNA LKRCPR+L PT LGNSS+EESQLETNVT+WEE+QE+EVVSTLRL+HVD+PLSVRC L+N+ LKRCPRKLSPTPLGNSSKEESQLETNVTFWEEDQEYEVVSTLRLRHVDQPLSVRCMLQNS VGQDTQEVIVVPHSLPFKXXXXXXXXXXXXXXXXXXXXXXMLWQKKPRYEIRWKVIESVS +G D+QEV VVPHSLPFK MLWQKKPRYEIRWKVIESVS MGGDSQEVTVVPHSLPFKVVVISAILALVVLTVISLIILIMLWQKKPRYEIRWKVIESVS SDGHEYIYVDPMQLPYDSTWELPRDQLVLGRTLGSGAFGQVVEATAHGLSHSQATMKVAV SDGHEYIYVDP+QLPYDSTWELPRDQLVLGRTLGSGAFGQVVEATAHGLSHSQATMKVAV SDGHEYIYVDPVQLPYDSTWELPRDQLVLGRTLGSGAFGQVVEATAHGLSHSQATMKVAV Which is better (amino acid sequence or DNA sequence) to study function? Which is better to study evolution?

Can there be a rate calculated for the changes that occur within a sequence. In other words how fast do changes occur within a gene. Rate equation number of changes per unit time How are number of changes estimated? Jukes – Cantor Model

Estimations trying to take into account changes that may have occurred that don’t result in a net change. Rates of change can be estimated Are rates the same for all DNA? Are mutation rates the same For all synonymous possibilities? For all proteins? For all amino acids? For organelles?

Molecular clocks changes in homologous proteins between species is directly proportional to time

Molecular phylogeny

Phylogenetic trees Which tree is correct? Data matrix- statistical approach Parsimony-based – simplest relationship, lowest number of mutations Bootstrapping

How are new genes created while still maintaining the “old” gene. Duplication of genes and/or exons

Terms Molecular clock Phylogenetic tree Branches Nodes Rooted tree Maximum parsimony Data matrix Bootstrap

Problems TextStudy Guide 24.1 pg 557 –