Genetic distance in housekeeping genes between Plasmodium falciparum and Plasmodium reichenowi and within P. falciparum.
The time to the most recent common ancestor of the extant populations of Plasmodium falciparum is controversial. The controversy primarily stems from the limited availability of sequences from Plasmodium reichenowi, a chimpanzee malaria parasite closely related to P. falciparum. Since the rate of nucleotide substitution differs in different loci and DNA regions, the estimation of genetic distance between P. falciparum and P. reichenowi should be performed using orthologous sequences that are evolving neutrally. Here, we obtained full-length sequences of two housekeeping genes, sarcoplasmic and endoplasmic reticulum Ca2+ -ATPase (serca) and lactate dehydrogenase (ldh), from 11 isolates of P. falciparum and 1 isolate of P. reichenowi and estimate the interspecific genetic distance (divergence) between the two species and intraspecific genetic distance (polymorphism) within P. falciparum. Interspecific distance and intraspecific distance at synonymous sites of interspecies-conserved regions of serca and ldh were 0.0672 +/- 0.0088 and 0.0011 +/- 0.0007, respectively, using the Nei and Gojobori method. Based on the ratio of interspecific distance to intraspecific distance, the time to the most recent common ancestor of P. falciparum was estimated to be (8.30 +/- 5.40) x 10(4) and (11.62 +/- 7.56) x 10(4) years ago, assuming the divergence time of the two parasite species to be 5 and 7 million years ago, respectively.
Tanabe
Kazuyuki
K
Laboratory of Biology, faculty of Engineering, Osaka Institute of Technology, Ohmiya 5-16-1, Asahi-ku, Osaka 535-8585, Japan. kztanabe@ge.oit.ac.jp
Sakihama
Naoko
N
Hattori
Tetsuya
T
Ranford-Cartwright
Lisa
L
Goldman
Ira
I
Escalante
Ananias A
AA
Lal
Altaf A
AA
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D000252:Calcium-Transporting ATPases / Q000737:chemistry; D017124:Conserved Sequence / Q000235:genetics; D019143:Evolution, Molecular; D017125:Genes, Protozoan / Q000235:genetics*; D014644:Genetic Variation / Q000235:genetics; D007438:Introns / Q000235:genetics; D008969:Molecular Sequence Data; D010961:Plasmodium / Q000145:classification / Q000235:genetics*; D010963:Plasmodium falciparum / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000235:genetics; D016415:Sequence Alignment
D000252:Calcium-Transporting ATPases