พิมพ์ดีเอ็นเอของ DNA typing of Calliphorids collected from human corpses
ที่เก็บได้จากศพมนุษย์ในประเทศมาเลเซียin Malaysia
Kavitha, R.1 * Kavitha, R.1*, Tan, T.C.2, Lee, H.L.3, Nazni, W.A.3 and Sofian-Azirun, M.1
¹ ¹50,603 Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
2 2Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
3Medical 3Medical Entomology Unit, Institute for Medical Research, Jalan Pahang, 50588 Kuala Lumpur, Malaysia
* *Corresponding author email: kavy1129@yahoo.com
ที่ได้รับ ได้รับการแก้ไขในรูปแบบ ได้รับการยอมรับ Received 18 November 2012; received in revised form 13 January 2013; accepted 14 January 2013
บทคัดย่อ Abstract. Estimation of post-mortem interval (PMI) is crucial for time of death determination.
The advent of DNA-based identification techniques forensic entomology saw the beginning
of a proliferation of molecular studies into forensically important Calliphoridae (Diptera). The
use of DNA to characterise morphologically indistinguishable immature calliphorids was
recognised as a valuable molecular tool with enormous practical utility. The local entomofauna
in most cases is important for the examination of entomological evidences. The survey of the
local entomofauna has become a fundamental first step in forensic entomological studies,
because different geographical distributions, seasonal and environmental factors may influence
the decomposition process and the occurrence of different insect species on corpses. In this
study, calliphorids were collected from 13 human corpses recovered from indoors, outdoors
and aquatic conditions during the post-mortem examination by pathologists from the
government hospitals in Malaysia. Only two species, Chrysomya megacephala and Chrysomya
rufifacies were recovered from human corpses. DNA sequencing was performed to study the
mitochondrial encoded COI gene and to evaluate the suitability of the 1300 base pairs of COI
fragments for identification of blow fly species collected from real crime scene. The COI
gene from blow fly specimens were sequenced and deposited in GenBank to expand local
databases. The sequenced COI gene was useful in identifying calliphorids retrieved from
human corpses.
INTRODUCTION
Forensic investigations of human corpses at
death scenes involve an estimation of the
post-mortem interval (PMI) which indicates
the time elapsed between death and the
discovery of the body. Long term PMI
estimations are best performed by calculating
the age of blow fly larvae developing on the
corpse (Smith, 1986; Catts & Goff, 1992; Goff,
2000; Gennard, 2007). The use of entomology
to estimate post-mortem intervals (PMIs) in
criminal investigations has been found to be
more reliable than autopsy and as reliable as
police eyewitness information (Kashyap &
Pillay, 1989).
Most forensic entomological evidence is
strongly dependent on accurate species
identification. This is crucial first
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