Marine turtles are increasingly being threatened
worldwide by anthropogenic activities. Better understanding of
their life cycle, behavior and population structure is imperative
for the design of adequate conservation strategies. The mtDNA
control region is a fast-evolving matrilineal marker that has been
employed in the study of marine turtle populations. We developed
and tested a simple molecular tracing system for Caretta caretta
mtDNA haplotypes by polymerase chain reaction-single strand
conformation polymorphism (PCR-SSCP). Using this technique,
we were able to distinguish the SSCP patterns of 18 individuals of the haplotypes CC-A4, CC-A24 and CCxLO, which are commonly
found in turtles sampled on the Brazilian coast. When we analyzed
15 turtles with previously unknown sequences, we detected two other
haplotypes, in addition to the other four. Based on DNA sequencing,
they were identified as the CC-A17 and CC-A1 haplotypes. Further
analyses were made with the sea turtles, Chelonia mydas (N = 8),
Lepidochelys olivacea (N = 3) and Eretmochelys imbricata (N = 1),
demonstrating that the PCR-SSCP technique is able to distinguish
intra- and interspecific variation in the family Cheloniidae. We found
that this technique can be useful for identifying sea turtle mtDNA
haplotypes, reducing the need for sequencing
Marine turtles are increasingly being threatenedworldwide by anthropogenic activities. Better understanding oftheir life cycle, behavior and population structure is imperativefor the design of adequate conservation strategies. The mtDNAcontrol region is a fast-evolving matrilineal marker that has beenemployed in the study of marine turtle populations. We developedand tested a simple molecular tracing system for Caretta carettamtDNA haplotypes by polymerase chain reaction-single strandconformation polymorphism (PCR-SSCP). Using this technique,we were able to distinguish the SSCP patterns of 18 individuals of the haplotypes CC-A4, CC-A24 and CCxLO, which are commonlyfound in turtles sampled on the Brazilian coast. When we analyzed15 turtles with previously unknown sequences, we detected two otherhaplotypes, in addition to the other four. Based on DNA sequencing,they were identified as the CC-A17 and CC-A1 haplotypes. Furtheranalyses were made with the sea turtles, Chelonia mydas (N = 8),Lepidochelys olivacea (N = 3) and Eretmochelys imbricata (N = 1),demonstrating that the PCR-SSCP technique is able to distinguishintra- and interspecific variation in the family Cheloniidae. We foundthat this technique can be useful for identifying sea turtle mtDNAhaplotypes, reducing the need for sequencing
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