1
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Kwiatkowski SC, Sanford MR, Donley M, Welch K, Kahn R. Simplified COI barcoding of blow, flesh, and scuttle flies encountered in medicolegal investigations. Forensic Sci Med Pathol 2024; 20:412-422. [PMID: 37222900 DOI: 10.1007/s12024-023-00653-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/10/2023] [Indexed: 05/25/2023]
Abstract
Accurate insect identification is critical to the estimation of time of colonization (TOC) and post-mortem interval (PMI) in medicolegal death investigations. DNA testing is advantageous because it enables the identification of immature specimens that may not be identified based on morphology alone. We describe here a simplified DNA barcoding method for identifying relevant species that may be implemented by forensic genetics laboratories. A cytochrome oxidase (COI) fragment is analyzed after PCR amplification with a single primer set. The method is effective for many species commonly encountered in death investigations in the USA: members of blowfly genera Calliphora, Chrysomya, Cochliomyia, Lucilia, and Phormia; members of the flesh fly genera Blaesoxipha, Oxysarcodexia, Ravinia, and Sarcophaga; and the scuttle fly Megaselia scalaris. We tested the method on specimens with verified identifications and used it to build a collection of reference sequences from specimens collected in Harris County, Texas. We show here the correct identification of larvae, pupae, and pupal exuviae from the medicolegal casework.
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Affiliation(s)
- Sam C Kwiatkowski
- Harris County Institute of Forensic Sciences, 1861 Old Spanish Trail, Houston, TX, 77054, USA.
| | - Michelle R Sanford
- Harris County Institute of Forensic Sciences, 1861 Old Spanish Trail, Houston, TX, 77054, USA
| | - Michael Donley
- Harris County Institute of Forensic Sciences, 1861 Old Spanish Trail, Houston, TX, 77054, USA
| | - Katherine Welch
- Harris County Institute of Forensic Sciences, 1861 Old Spanish Trail, Houston, TX, 77054, USA
| | - Roger Kahn
- Harris County Institute of Forensic Sciences, 1861 Old Spanish Trail, Houston, TX, 77054, USA
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2
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Parker TB, Meiklejohn KA, Dahlem GA, Eagle RC, Heersink MJ. Ophthalmomyiasis Case Caused by Two Blow Fly (Diptera: Calliphoridae) Species in North America. ScientificWorldJournal 2024; 2024:2209301. [PMID: 38774420 PMCID: PMC11108687 DOI: 10.1155/2024/2209301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 03/26/2024] [Accepted: 04/21/2024] [Indexed: 05/24/2024] Open
Abstract
Ophthalmomyiasis is the result of fly larvae feeding on the tissues of the eye. Commonly associated with poor hygiene and open wounds, this condition is rare and often stigmatized. Treatment can be straightforward, and full recovery is common. Identifying the species responsible for ophthalmomyiasis is important for the medical, forensic, and entomological communities. Here, we present a case of ophthalmomyiasis where 30-40 blow fly (Diptera: Calliphoridae) larvae were removed from the eye of a human male. A representative subsample of five larvae was used for taxonomic identification via two approaches (a) DNA analysis, via sequencing of the complete mitochondrial genome (mtGenome) and comparison of the mtGenome and mitochondrial COI barcode region to GenBank, and (b) morphology, examination of the posterior spiracles using microscopy, and comparison to published larval descriptions of blow flies. Two species of blow flies were identified from the DNA analysis: Lucilia coeruleiviridis and Phormia regina. Morphological examination could only confirm L. coeruleiviridis as being present. To our knowledge, finding two blow fly species causing ophthalmomyiasis in a single individual has not been previously reported in the scientific literature. Neither P. regina nor L. coeruleiviridis prefers living tissue for larva development, but since they fill similar ecological niches, perhaps this was a show of competition rather than a normal feeding habit. Knowing these blow fly species can resort to this behavior, and that it can affect human populations, is valuable to the education of patients and providers.
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Affiliation(s)
- Taylor B. Parker
- Department of Population Health and Pathobiology, North Carolina State University, 1060 William Moore Drive, Raleigh, NC 27606, USA
| | - Kelly A. Meiklejohn
- Department of Population Health and Pathobiology, North Carolina State University, 1060 William Moore Drive, Raleigh, NC 27606, USA
| | - Gregory A. Dahlem
- Department of Biological Sciences, Northern Kentucky University, Nunn Drive, Highland Heights, KY 41099, USA
| | - Ralph C. Eagle
- Department of Pathology, Wills Eye Hospital, 840 Walnut Street, Philadelphia, PA 19107, USA
| | - Marius J. Heersink
- Department of Ophthalmology, Wills Eye Hospital, Sidney Kimmel Medical College of Thomas Jefferson University, 840 Walnut Street, Philadelphia, PA 19107, USA
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3
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Smith JJ, Brzezinski P, Dziedziula J, Rosenthal E, Klaus M. Partial Ribosomal Nontranscribed Spacer Sequences Distinguish Rhagoletis zephyria (Diptera: Tephritidae) From the Apple Maggot, R. pomonella. JOURNAL OF ECONOMIC ENTOMOLOGY 2022; 115:647-661. [PMID: 35048980 PMCID: PMC9007244 DOI: 10.1093/jee/toab264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Indexed: 06/14/2023]
Abstract
The apple maggot, Rhagoletis pomonella (Walsh), was introduced into the apple-growing regions of the Pacific Northwest in the U.S.A. during the past 60-100 yr. Apple maggot (larvae, puparia, and adults) is difficult to distinguish from its morphologically similar sister species, Rhagoletis zephyria Snow, which is native and abundant in the Pacific Northwest. While morphological identifications are common practice, a simple, inexpensive assay based on genetic differences would be very useful when morphological traits are unclear. Here we report nucleotide substitution and insertion-deletion mutations in the nontranscribed spacer (NTS) of the ribosomal RNA gene cistron of R. pomonella and R. zephyria that appear to be diagnostic for these two fly species. Insertion-deletion variation is substantial and results in a 49 base-pair difference in PCR amplicon size between R. zephyria and R. pomonella that can be scored using agarose gel electrophoresis. PCR amplification and DNA sequencing of 766 bp of the NTS region from 38 R. pomonella individuals and 35 R. zephyria individuals from across their geographic ranges led to the expected PCR fragments of approx. 840 bp and 790 bp, respectively, as did amplification and sequencing of a smaller set of 26 R. pomonella and 16 R. zephyria flies from a sympatric site in Washington State. Conversely, 633 bp mitochondrial COI barcode sequences from this set of flies were polyphyletic with respect to R. pomonella and R. zephyria. Thus, differences in NTS PCR products on agarose gels potentially provide a simple way to distinguish between R. pomonella and R. zephyria.
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Affiliation(s)
- J J Smith
- Department of Entomology, Michigan State University, 244 Farm Lane, Room 243, Michigan State University, East Lansing, MI 48825-1115, USA
- Lyman Briggs College, Michigan State University, 919 E. Shaw Lane, Room E-35, East Lansing, MI 48825-3804, USA
| | - P Brzezinski
- Lyman Briggs College, Michigan State University, 919 E. Shaw Lane, Room E-35, East Lansing, MI 48825-3804, USA
| | - J Dziedziula
- Lyman Briggs College, Michigan State University, 919 E. Shaw Lane, Room E-35, East Lansing, MI 48825-3804, USA
| | - E Rosenthal
- Lyman Briggs College, Michigan State University, 919 E. Shaw Lane, Room E-35, East Lansing, MI 48825-3804, USA
| | - M Klaus
- Plant Protection Division, Washington State Department of Agriculture, 21 North 1st Avenue Suite 103, Yakima, WA 98902, USA
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Jonika MM, Hjelmen CE, Faris AM, McGuane AS, Tarone AM. An Evaluation of Differentially Spliced Genes as Markers of Sex for Forensic Entomology,. J Forensic Sci 2020; 65:1579-1587. [PMID: 32501598 DOI: 10.1111/1556-4029.14461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 05/05/2020] [Accepted: 05/06/2020] [Indexed: 11/30/2022]
Abstract
Blow flies (Calliphoridae) are important medically and economically and are commonly used in forensics as temporal markers in death investigations. While phenotypic traits in adult flies can be sexually dimorphic, sex identification in immatures is difficult. Consequently, little is known about how sex may result in developmental disparities among sexes even though there are indications that they may be important in some instances. Since genetic mechanisms for sex are well studied in model flies and species of agricultural and medical importance, we exploit the sex-specifically spliced genes transformer (tra) and doublesex (dsx) in the sex determination pathway to optimize a sex identification assay for immatures. Using known primer sets for tra and with a novel one for dsx, we develop PCR assays for identifying sex in four forensically relevant Calliphoridae species: Lucilia sericata (Meigen), Lucilia cuprina (Wiedemann), Cochliomyia macellaria (Fabricius), and Chrysomya rufifacies (Macquart) and evaluated their performance. Band detection rates were found to range from 71 to 100%, call rates ranged from 90 to 100%, and no error was found when bands could be called. Such information is informative for purposes of testimony and in preparation for development studies. The developed assays will assist in further differentiating sexually dimorphic differences in development of the Calliphoridae and aid in more accurately estimating insect age when age predictive markers (size, development time, molecular expression) are sexually dimorphic.
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Affiliation(s)
- Michelle M Jonika
- Department of Entomology, Texas A&M AgriLife Extension Service, Texas A&M University, 2475 TAMU, 370 Olsen Blvd., College Station, TX, 77843.,Department of Biology, Texas A&M University, 3258 TAMU, 525 Lubbock St., College Station, TX, 77843.,Genetics Interdisciplinary Program, Texas A&M University, 2128 TAMU, 300 Olsen Blvd., College Station, TX, 77843
| | - Carl E Hjelmen
- Department of Entomology, Texas A&M AgriLife Extension Service, Texas A&M University, 2475 TAMU, 370 Olsen Blvd., College Station, TX, 77843.,Department of Biology, Texas A&M University, 3258 TAMU, 525 Lubbock St., College Station, TX, 77843
| | - Ashleigh M Faris
- Department of Entomology, Texas A&M AgriLife Extension Service, Texas A&M University, 2475 TAMU, 370 Olsen Blvd., College Station, TX, 77843.,Texas A&M AgriLife Research and Extension Center, Texas A&M University, 10345 TX-44, Corpus Christi, TX, 78406
| | - Alexander S McGuane
- Department of Entomology, Texas A&M AgriLife Extension Service, Texas A&M University, 2475 TAMU, 370 Olsen Blvd., College Station, TX, 77843.,Harris County Institute of Forensic Sciences, 1861 Old Spanish Trail, Houston, TX, 77054
| | - Aaron M Tarone
- Department of Entomology, Texas A&M AgriLife Extension Service, Texas A&M University, 2475 TAMU, 370 Olsen Blvd., College Station, TX, 77843
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Moreno EA, Amat E, Meneses PE, Donoso DA, Barragán ÁR. Green bottle flies (Calliphoridae, Luciliinae) of Ecuador: geographic distribution, checklist and DNA barcodes. NEOTROPICAL BIODIVERSITY 2020. [DOI: 10.1080/23766808.2020.1804747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- Emilia A. Moreno
- Museo de Zoología QCAZ, Departamento de Ciencias Biológicas, Pontificia Universidad Católica del Ecuador, Quito, Ecuador
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), CONICET – Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Eduardo Amat
- Grupo de Investigación Bioforense, Facultad de Derecho y Ciencias Forenses - Tecnológico de Antioquia, Institución Universitaria, Medellín, Colombia
| | - Pablo E. Meneses
- Facultad de Ciencias Socioambientales, Universidad Regional Amazónica Ikiam, Napo, Ecuador
| | - David A. Donoso
- Escuela Politécnica Nacional, Departamento de Biología, Quito, Ecuador
- Centro de Investigación de la Biodiversidad y Cambio Climático, Universidad Tecnológica Indoamérica, Quito, Ecuador
| | - Álvaro R. Barragán
- Museo de Zoología QCAZ, Departamento de Ciencias Biológicas, Pontificia Universidad Católica del Ecuador, Quito, Ecuador
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Gemmellaro MD, Hamilton GC, Ware JL. Review of Molecular Identification Techniques for Forensically Important Diptera. JOURNAL OF MEDICAL ENTOMOLOGY 2019; 56:887-902. [PMID: 31173634 DOI: 10.1093/jme/tjz040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Indexed: 06/09/2023]
Abstract
The medico-legal section of forensic entomology focuses on the analysis of insects associated with a corpse. Such insects are identified, and their life history characteristics are evaluated to provide information related to the corpse, such as postmortem interval and time of colonization. Forensically important insects are commonly identified using dichotomous keys, which rely on morphological characteristics. Morphological identifications can pose a challenge as local keys are not always available and can be difficult to use, especially when identifying juvenile stages. If a specimen is damaged, certain keys cannot be used for identification. In contrast, molecular identification can be a better instrument to identify forensically important insects, regardless of life stage or specimen completeness. Despite more than 20 yr since the first use of molecular data for the identification of forensic insects, there is little overlap in gene selection or phylogenetic methodology among studies, and this inconsistency reduces efficiency. Several methods such as genetic distance, reciprocal monophyly, or character-based methods have been implemented in forensic identification studies. It can be difficult to compare the results of studies that employ these different methods. Here we present a comprehensive review of the published results for the molecular identification of Diptera of forensic interest, with an emphasis on evaluating variation among studies in gene selection and phylogenetic methodology.
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Affiliation(s)
| | | | - Jessica L Ware
- Department of Entomology, Rutgers University, New Brunswick, NJ
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Owings CG, Picard CJ. New Distribution Record for Lucilia cuprina (Diptera: Calliphoridae) in Indiana, United States. JOURNAL OF INSECT SCIENCE (ONLINE) 2018; 18:5060814. [PMID: 30060212 PMCID: PMC6104636 DOI: 10.1093/jisesa/iey071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Indexed: 06/08/2023]
Abstract
Determining range expansion for insect species is vital in order to evaluate their impact on new ecosystems and communities. This is particularly important for species which could be potentially harmful to humans or domestic animals. Lucilia cuprina Wiedemann (Diptera: Calliphoridae) can act as a facultative ectoparasite and has an extensive history as the primary inducer of sheep-strike in Australia, New Zealand, and Africa. We present here the first record of this species in Indiana, United States. Lucilia cuprina's range expansion northward in the United States may be indicative of changing environmental conditions conducive to the proliferation of this species into historically cooler climates. The presence of this species could significantly impact forensic death investigations utilizing dipteran larvae to estimate a minimum postmortem interval. If range expansion of this species is not taken into account by a forensic entomologist (especially if L. cuprina is not known previously in their region), an inaccurate minimum postmortem interval (PMIMIN) estimation may be made, given the differences in development times for both species. Therefore, the range expansion of this fly could have large impacts for many different entomological disciplines.
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Affiliation(s)
- Charity G Owings
- Department of Biology, Indiana University–Purdue University Indianapolis, SL, Indianapolis, IN
| | - Christine J Picard
- Department of Biology, Indiana University–Purdue University Indianapolis, SL, Indianapolis, IN
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8
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Picard CJ, Wells JD, Ullyot A, Rognes K. Amplified fragment length polymorphism analysis supports the valid separate species status of Lucilia caesar and L. illustris (Diptera: Calliphoridae). Forensic Sci Res 2017; 3:60-64. [PMID: 30483652 PMCID: PMC6197086 DOI: 10.1080/20961790.2017.1398286] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Accepted: 10/26/2017] [Indexed: 11/22/2022] Open
Abstract
Common DNA-based species determination methods fail to distinguish some blow flies in the forensically and medically important genus Lucilia Robineau-Desvoidy. This is a practical problem, and it has also been interpreted as casting doubt on the validity of some morphologically defined species. An example is Lucilia illustris and L. caesar, which co-occur in Europe whilst only L. illustris has been collected in North America. Reports that these species shared both mitochondrial and nuclear gene sequences, along with claims that diagnostic morphological characters are difficult to interpret, were used to question their separate species status. We report here that amplified fragment length polymorphism profiles strongly support the validity of both species based on both assignment and phylogenetic analysis, and that traditional identification criteria based on male and female genital morphology are more reliable than has been claimed.
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Affiliation(s)
- Christine J Picard
- Department of Biology & Forensic and Investigative Sciences Program, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Jeffrey D Wells
- Department of Biological Sciences & International Forensic Research Institute, Florida International University, Miami, FL, USA
| | - Anne Ullyot
- Department of Biology & Forensic and Investigative Sciences Program, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA.,Biological Sciences, University of Chicago, Chicago, IL, USA
| | - Knut Rognes
- Department of Early Childhood Education, Faculty of Arts and Education, University of Stavanger, Stavanger, Norway
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9
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Bharti M, Singh B. DNA-Based Identification of Forensically Important Blow Flies (Diptera: Calliphoridae) From India. JOURNAL OF MEDICAL ENTOMOLOGY 2017; 54:1151-1156. [PMID: 28419283 DOI: 10.1093/jme/tjx084] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Indexed: 06/07/2023]
Abstract
Correct species identification is the first and the most important criteria in entomological evidence-based postmortem interval (PMI) estimation. Although morphological keys are available for species identification of adult blow flies, keys for immature stages are either lacking or are incomplete. In this study, cytochrome oxidase subunit 1 (COI) reference data were developed from nine species (belonging to three subfamilies, namely, Calliphorinae, Luciliinae, and Chrysomyinae) of blow flies from India. Seven of the nine species included in this study were found suitable for DNA-based identification using COI gene, because they showed nonoverlapping intra- (0.0-0.3%) and inter-(1.96-18.14%) specific diversity, and formed well-supported monophyletic clade in phylogenetic analysis. The remaining two species (i.e., Chrysomya megacephala (Fabricius) and Chrysomya chani Kurahashi) cannot be distinguished reliably using our database because they had a very low interspecific diversity (0.11%), and Ch. megacephala was paraphyletic with respect to Ch. chani in the phylogenetic analysis. We conclude that the COI gene is a useful marker for DNA-based identification of blow flies from India.
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Affiliation(s)
- Meenakshi Bharti
- Department of Zoology and Environmental Sciences, Punjabi University, Patiala, Punjab 147002, India
| | - Baneshwar Singh
- Department of Forensic Science, Virginia Commonwealth University, Richmond, VA 23284
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Yusseff-Vanegas SZ, Agnarsson I. DNA-barcoding of forensically important blow flies (Diptera: Calliphoridae) in the Caribbean Region. PeerJ 2017; 5:e3516. [PMID: 28761780 PMCID: PMC5531032 DOI: 10.7717/peerj.3516] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Accepted: 06/07/2017] [Indexed: 11/20/2022] Open
Abstract
Correct identification of forensically important insects, such as flies in the family Calliphoridae, is a crucial step for them to be used as evidence in legal investigations. Traditional identification based on morphology has been effective, but has some limitations when it comes to identifying immature stages of certain species. DNA-barcoding, using COI, has demonstrated potential for rapid and accurate identification of Calliphoridae, however, this gene does not reliably distinguish among some recently diverged species, raising questions about its use for delimitation of species of forensic importance. To facilitate DNA based identification of Calliphoridae in the Caribbean we developed a vouchered reference collection from across the region, and a DNA sequence database, and further added the nuclear ITS2 as a second marker to increase accuracy of identification through barcoding. We morphologically identified freshly collected specimens, did phylogenetic analyses and employed several species delimitation methods for a total of 468 individuals representing 19 described species. Our results show that combination of COI + ITS2 genes yields more accurate identification and diagnoses, and better agreement with morphological data, than the mitochondrial barcodes alone. All of our results from independent and concatenated trees and most of the species delimitation methods yield considerably higher diversity estimates than the distance based approach and morphology. Molecular data support at least 24 distinct clades within Calliphoridae in this study, recovering substantial geographic variation for Lucilia eximia, Lucilia retroversa, Lucilia rica and Chloroprocta idioidea, probably indicating several cryptic species. In sum, our study demonstrates the importance of employing a second nuclear marker for barcoding analyses and species delimitation of calliphorids, and the power of molecular data in combination with a complete reference database to enable identification of taxonomically and geographically diverse insects of forensic importance.
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Affiliation(s)
| | - Ingi Agnarsson
- Department of Biology, University of Vermont, Burlington, VT, United States of America
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11
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Stamper T, Wong ES, Timm A, DeBry RW. Validating sonication as a DNA extraction method for use with carrion flies. Forensic Sci Int 2017; 275:171-177. [DOI: 10.1016/j.forsciint.2017.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 01/27/2017] [Accepted: 02/15/2017] [Indexed: 11/28/2022]
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Sontigun N, Sukontason KL, Zajac BK, Zehner R, Sukontason K, Wannasan A, Amendt J. Wing morphometrics as a tool in species identification of forensically important blow flies of Thailand. Parasit Vectors 2017; 10:229. [PMID: 28486970 PMCID: PMC5424331 DOI: 10.1186/s13071-017-2163-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 05/01/2017] [Indexed: 12/19/2022] Open
Abstract
Background Correct species identification of blow flies is a crucial step for understanding their biology, which can be used not only for designing fly control programs, but also to determine the minimum time since death. Identification techniques are usually based on morphological and molecular characters. However, the use of classical morphology requires experienced entomologists for correct identification; while molecular techniques rely on a sound laboratory expertise and remain ambiguous for certain taxa. Landmark-based geometric morphometric analysis of insect wings has been extensively applied in species identification. However, few wing morphometric analyses of blow fly species have been published. Methods We applied a landmark-based geometric morphometric analysis of wings for species identification of 12 medically and forensically important blow fly species of Thailand. Nineteen landmarks of each right wing of 372 specimens were digitised. Variation in wing size and wing shape was analysed and evaluated for allometric effects. The latter confirmed the influence of size on the shape differences between species and sexes. Wing shape variation among genera and species were analysed using canonical variates analysis followed by a cross-validation test. Results Wing size was not suitable for species discrimination, whereas wing shape can be a useful tool to separate taxa on both, genus and species level depending on the analysed taxa. It appeared to be highly reliable, especially for classifying Chrysomya species, but less robust for a species discrimination in the genera Lucilia and Hemipyrellia. Allometry did not affect species separation but had an impact on sexual shape dimorphism. Conclusions A landmark-based geometric morphometric analysis of wings is a useful additional method for species discrimination. It is a simple, reliable and inexpensive method, but it can be time-consuming locating the landmarks for a large scale study and requires non-damaged wings for analysis. Electronic supplementary material The online version of this article (doi:10.1186/s13071-017-2163-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Narin Sontigun
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Kabkaew L Sukontason
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.
| | - Barbara K Zajac
- Institute of Legal Medicine, Forensic Biology/Entomology, Kennedyallee 104, 60596, Frankfurt am Main, Germany
| | - Richard Zehner
- Institute of Legal Medicine, Forensic Biology/Entomology, Kennedyallee 104, 60596, Frankfurt am Main, Germany
| | - Kom Sukontason
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Anchalee Wannasan
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Jens Amendt
- Institute of Legal Medicine, Forensic Biology/Entomology, Kennedyallee 104, 60596, Frankfurt am Main, Germany
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Chen J, Qiu D, Yue Q, Wang C, Li X. The complete mitochondria genome of Chrysomya phaonis (Seguy, 1928) (Diptera: Calliphoridae). MITOCHONDRIAL DNA PART B-RESOURCES 2017; 1:951-953. [PMID: 33473689 PMCID: PMC7800608 DOI: 10.1080/23802359.2016.1233466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Chrysomya phaonis (Seguy, 1928) is one of the blowflies of great medical and forensic importance. In this paper, we report that the entire genome of mitochondrial DNA of C. phaonis is 15,831 bp in length, which consists of 39 genes including13 protein-coding genes, 24 tRNA genes, 2 mitochondrial ribosomal RNA genes, and a 992 bp non-coding A + T-rich region. The overall base compositions of A, G, C, and T are 38.79%, 9.75%, 14.15%, and 37.31%, respectively. We provide the first complete mitochondrial genome of C. phaonis, and should provide useful information for phylogenetic and species identification for C. phaonis.
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Affiliation(s)
- Jian Chen
- Zhongshan Entry-Exit Inspection and Quarantine Technology Center, Zhongshan, Guangdong, P.R. China
| | - Deyi Qiu
- Zhongshan Entry-Exit Inspection and Quarantine Technology Center, Zhongshan, Guangdong, P.R. China
| | - Qiaoyun Yue
- Zhongshan Entry-Exit Inspection and Quarantine Technology Center, Zhongshan, Guangdong, P.R. China
| | - Chuanxian Wang
- Shanghai Entry-Exit Inspection and Quarantine Bureau, Shanghai, P.R. China
| | - Xiaohong Li
- Shanghai Entry-Exit Inspection and Quarantine Bureau, Shanghai, P.R. China
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Yusseff-Vanegas S, Agnarsson I. Molecular phylogeny of the forensically important genus Cochliomyia (Diptera: Calliphoridae). Zookeys 2016:107-20. [PMID: 27563274 PMCID: PMC4984421 DOI: 10.3897/zookeys.609.8638] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2016] [Accepted: 07/25/2016] [Indexed: 11/12/2022] Open
Abstract
Cochliomyia Townsend includes several abundant and one of the most broadly distributed, blow flies in the Americas, and is of significant economic and forensic importance. For decades, Cochliomyia hominivorax (Coquerel) and Cochliomyia macellaria (Fabricius) have received attention as livestock parasites and primary indicator species in forensic entomology. However, Cochliomyia minima Shannon and Cochliomyia aldrichi Del Ponte have only been subject to basic taxonomy and faunistic studies. Here we present the first complete phylogeny of Cochliomyia including numerous specimens per species, collected from 13 localities in the Caribbean. Four genes, the mitochondrial COI and the nuclear EF-1α, 28S rRNA, and ITS2, were analyzed. While we found some differences among gene trees, a concatenated gene matrix recovered a robustly supported monophyletic Cochliomyia with Compsomyiops Townsend as its sister group and recovered the monophyly of Cochliomyia hominivorax, Cochliomyia macellaria and Cochliomyia minima. Our results support a close relationship between Cochliomyia minima and Cochliomyia aldrichi. However, we found Cochliomyia aldrichi containing Cochliomyia minima, indicating recent speciation, or issues with the taxonomy of the group. We provide basic information on habitat preference, distribution and feeding habits of Cochliomyia minima and Cochliomyia aldrichi that will be useful for future forensic studies in the Caribbean.
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Affiliation(s)
- Sohath Yusseff-Vanegas
- Department of Biology, University of Vermont, 109 Carrigan Drive, Burlington, VT 05405, USA
| | - Ingi Agnarsson
- Department of Biology, University of Vermont, 109 Carrigan Drive, Burlington, VT 05405, USA
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15
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Pilli E, Agostino A, Vergani D, Salata E, Ciuna I, Berti A, Caramelli D, Lambiase S. Human identification by lice: A Next Generation Sequencing challenge. Forensic Sci Int 2016; 266:e71-e78. [PMID: 27289564 DOI: 10.1016/j.forsciint.2016.05.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 04/13/2016] [Accepted: 05/08/2016] [Indexed: 11/20/2022]
Abstract
Rapid and progressive advances in molecular biology techniques and the advent of Next Generation Sequencing (NGS) have opened new possibilities for analyses also in the identification of entomological matrixes. Insects and other arthropods are widespread in nature and those found at a crime scene can provide a useful contribution to forensic investigations. Entomological evidence is used by experts to define the postmortem interval (PMI), which is essentially based on morphological recognition of the insect and an estimation of its insect life cycle stage. However, molecular genotyping methods can also provide an important support for forensic entomological investigations when the identification of species or human genetic material is required. This case study concerns a collection of insects found in the house of a woman who died from unknown causes. Initially the insects were identified morphologically as belonging to the Pediculidae family, and then, human DNA was extracted and analyzed from their gastrointestinal tract. The application of the latest generation forensic DNA assays, such as the Quantifiler(®) Trio DNA Quantification Kit and the HID-Ion AmpliSeq™ Identity Panel (Applied Biosystems(®)), individuated the presence of human DNA in the samples and determined the genetic profile.
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Affiliation(s)
- Elena Pilli
- Dipartimento di Biologia, Università di Firenze, via del Proconsolo 12, 50122 Firenze, Italy.
| | - Alessandro Agostino
- Life Sciences Solutions, Thermo Fisher Scientific, Via Tiepolo 1, 20090 Monza, Italy
| | - Debora Vergani
- Dipartimento di Sanità Pubblica, Medicina Sperimentale e Forense, Università di Pavia, Viale Forlanini, 12, 27100 Pavia, Italy
| | - Elena Salata
- Reparto Carabinieri Investigazioni Scientifiche di Roma, Sezione di Biologia, viale Tor di Quinto 119, Roma, Italy
| | - Ignazio Ciuna
- Reparto Carabinieri Investigazioni Scientifiche di Roma, Sezione di Biologia, viale Tor di Quinto 119, Roma, Italy
| | - Andrea Berti
- Reparto Carabinieri Investigazioni Scientifiche di Roma, Sezione di Biologia, viale Tor di Quinto 119, Roma, Italy
| | - David Caramelli
- Dipartimento di Biologia, Università di Firenze, via del Proconsolo 12, 50122 Firenze, Italy
| | - Simonetta Lambiase
- Dipartimento di Sanità Pubblica, Medicina Sperimentale e Forense, Università di Pavia, Viale Forlanini, 12, 27100 Pavia, Italy
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Zajac BK, Sontigun N, Wannasan A, Verhoff MA, Sukontason K, Amendt J, Zehner R. Application of DNA barcoding for identifying forensically relevant Diptera from northern Thailand. Parasitol Res 2016; 115:2307-20. [PMID: 26965427 DOI: 10.1007/s00436-016-4977-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 03/01/2016] [Indexed: 01/31/2023]
Abstract
In recent decades, forensic entomology has become a useful tool in criminal investigations all over the world. Species-specific identification of flies plays an important role in this field and is obligatory for accurate calculation of the post-mortem interval. However, not all important colonizers of a corpse can be identified by common morphological keys. Due to similar morphology and the lack of keys for some taxa, especially for immature stages, DNA barcoding has become more popular during the last recent years. This development is particularly important for countries like Thailand, in which forensic entomology is a newly developing research area and which faces several challenges such as a high biodiversity of fly species. The most commonly used barcoding region in forensic entomology, the mitochondrial cytochrome oxidase subunit 1 (coI) gene, as well as a 1000-bp-long region of the 28S nuclear rRNA gene, was used to analyze and establish the molecular barcodes of 13 different species of flies of forensic relevance in northern Thailand.
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Affiliation(s)
- Barbara Karolina Zajac
- Institute of Legal Medicine, Forensic Biology/Entomology, Kennedyallee 104, 60596, Frankfurt am Main, Germany.
| | - Narin Sontigun
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Anchalee Wannasan
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Marcel A Verhoff
- Institute of Legal Medicine, Forensic Biology/Entomology, Kennedyallee 104, 60596, Frankfurt am Main, Germany
| | - Kabkaew Sukontason
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Jens Amendt
- Institute of Legal Medicine, Forensic Biology/Entomology, Kennedyallee 104, 60596, Frankfurt am Main, Germany
| | - Richard Zehner
- Institute of Legal Medicine, Forensic Biology/Entomology, Kennedyallee 104, 60596, Frankfurt am Main, Germany
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17
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Williams KA, Lamb J, Villet MH. Phylogenetic radiation of the greenbottle flies (Diptera, Calliphoridae, Luciliinae). Zookeys 2016; 568:59-86. [PMID: 27103874 PMCID: PMC4829670 DOI: 10.3897/zookeys.568.6696] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 01/18/2016] [Indexed: 11/12/2022] Open
Abstract
The subfamily Luciliinae is diverse and geographically widespread. Its four currently recognised genera (Dyscritomyia Grimshaw, 1901, Hemipyrellia Townsend, 1918, Hypopygiopsis Townsend 1916 and Lucilia Robineau-Desvoidy, 1830) contain species that range from saprophages to obligate parasites, but their pattern of phylogenetic diversification is unclear. The 28S rRNA, COI and Period genes of 14 species of Lucilia and Hemipyrellia were partially sequenced and analysed together with sequences of 11 further species from public databases. The molecular data confirmed molecular paraphyly in three species-pairs in Lucilia that hamper barcode identifications of those six species. Lucilia sericata and Lucilia cuprina were confirmed as mutual sister species. The placements of Dyscritomyia and Hypopygiopsis were ambiguous, since both made Lucilia paraphyletic in some analyses. Recognising Hemipyrellia as a genus consistently left Lucilia s.l. paraphyletic, and the occasionally-recognised (sub)genus Phaenicia was consistently paraphyletic, so these taxa should be synonymised with Lucilia to maintain monophyly. Analysis of a matrix of 14 morphological characters scored for adults of all genera and for most of the species included in the molecular analysis confirmed several of these findings. The different degrees of parasitism were phylogenetically clustered within this genus but did not form a graded series of evolutionary stages, and there was no particular relationship between feeding habits and biogeography. Because of the ubiquity of hybridization, introgression and incomplete lineage sorting in blow flies, we recommend that using a combination of mitochondrial and nuclear markers should be a procedural standard for medico-criminal forensic identifications of insects.
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Affiliation(s)
- Kirstin A. Williams
- Entomology Department, Durban Natural Science Museum, Durban, South Africa
- Southern African Forensic Entomology Research Laboratory, Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa
| | - Jennifer Lamb
- School of Life Sciences, University of KwaZulu-Natal, South Africa
| | - Martin H. Villet
- Southern African Forensic Entomology Research Laboratory, Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa
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18
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Zajac BK, Martin-Vega D, Feddern N, Fremdt H, e Castro CP, Szpila K, Reckel F, Schütt S, Verhoff MA, Amendt J, Zehner R. Molecular identification and phylogenetic analysis of the forensically important family Piophilidae (Diptera) from different European locations. Forensic Sci Int 2016; 259:77-84. [DOI: 10.1016/j.forsciint.2015.12.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2015] [Revised: 12/13/2015] [Accepted: 12/15/2015] [Indexed: 11/29/2022]
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19
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Nakano A, Honda J. Use of DNA sequences to identify forensically important fly species and their distribution in the coastal region of Central California. Forensic Sci Int 2015; 253:1-13. [PMID: 26025701 DOI: 10.1016/j.forsciint.2015.05.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 04/10/2015] [Accepted: 05/01/2015] [Indexed: 10/23/2022]
Abstract
Forensic entomology has gained prominence in recent years, as improvements in DNA technology and molecular methods have allowed insect and other arthropod evidence to become increasingly useful in criminal and civil investigations. However, comprehensive faunal inventories are still needed, including cataloging local DNA sequences for forensically significant Diptera. This multi-year fly-trapping study was built upon and expanded a previous survey of these flies in Santa Clara County, including the addition of genetic barcoding data from collected species of flies. Flies from the families Calliphoridae, Sarcophagidae, and Muscidae were trapped in meat-baited traps set in a variety of locations throughout the county. Flies were identified using morphological features and confirmed by molecular analysis. A total of 16 calliphorid species, 11 sarcophagid species, and four muscid species were collected and differentiated. This study found more species of flies than previous area surveys and established new county records for two calliphorid species: Cynomya cadaverina and Chrysomya rufifacies. Differences were found in fly fauna in different areas of the county, indicating the importance of microclimates in the distribution of these flies. Molecular analysis supported the use of DNA barcoding as an effective method of identifying cryptic fly species.
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Affiliation(s)
- Angie Nakano
- Santa Clara County Vector Control District, 1580 Berger Drive, San Jose, CA 95112, USA; Department of Biological Sciences, San Jose State University, One Washington Square, San Jose, CA 95192, USA
| | - Jeff Honda
- Department of Biological Sciences, San Jose State University, One Washington Square, San Jose, CA 95192, USA.
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20
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Salem AM, Adham FK, Picard CJ. Survey of the Genetic Diversity of Forensically Important Chrysomya (Diptera: Calliphoridae) from Egypt. JOURNAL OF MEDICAL ENTOMOLOGY 2015; 52:320-328. [PMID: 26334805 DOI: 10.1093/jme/tjv013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Accepted: 12/16/2014] [Indexed: 06/05/2023]
Abstract
Minimum postmortem interval estimations of a corpse using blow fly larvae in medicolegal investigations require correct identification and the application of appropriate developmental data of the identified fly species. Species identification of forensically relevant blow flies could be very difficult and time consuming when specimens are damaged or in the event of morphologically indistinguishable immature stages, which are most common at crime scenes. In response to this, an alternative, accurate determination of species may depend on sequencing and molecular techniques for identification. Chrysomyinae specimens (n = 158) belonging to three forensically important species [Chrysomya albiceps (Wiedemann), Chrysomya megacephala (F.), and Chrysomya marginalis (Wiedemann)] (Diptera: Calliphoridae) were collected from four locations in Egypt (Giza, Dayrout, Minya, and North Sinai) and sequenced across the mitochondrial cytochrome oxidase subunit I (COI) gene. Phylogenetic analyses using neighbor-joining, maximum likelihood and maximum parsimony methods resulted in the same topological structure and confirmed DNA based identification of all specimens. Interspecific divergence between pairs of species was 5.3% (C. marginalis-C. megacephala), 7% (C. albiceps-C. megacephala), and 8% (C. albiceps-C. marginalis). These divergences are sufficient to confirm the utility of cytochrome oxidase subunit I gene in the molecular identification of these flies in Egypt. Importantly, the maximum intraspecific divergence among individuals within a species was <1% and the least nucleotide divergence between species used for phylogenetic analysis was 3.6%. This study highlights the need for thorough and diverse sampling to capture all of the possible genetic diversity if DNA barcoding is to be used for molecular identification.
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Affiliation(s)
- Abeer M Salem
- Department of Biology, Indiana University Purdue University Indianapolis (IUPUI), 723 W. Michigan Street, SL 306 Indianapolis, IN 46202. Department of Entomology, Faculty of Science, Cairo University, P.O. Box 12613, Giza, 12613, Egypt.
| | - Fatma K Adham
- Department of Entomology, Faculty of Science, Cairo University, P.O. Box 12613, Giza, 12613, Egypt
| | - Christine J Picard
- Department of Biology, Indiana University Purdue University Indianapolis (IUPUI), 723 W. Michigan Street, SL 306 Indianapolis, IN 46202
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21
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Jordaens K, Sonet G, Braet Y, De Meyer M, Backeljau T, Goovaerts F, Bourguignon L, Desmyter S. DNA barcoding and the differentiation between North American and West European Phormia regina (Diptera, Calliphoridae, Chrysomyinae). Zookeys 2013; 365:149-74. [PMID: 24453556 PMCID: PMC3890676 DOI: 10.3897/zookeys.365.6202] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 12/06/2013] [Indexed: 11/26/2022] Open
Abstract
Phormia regina (the black fly) is a common Holarctic blow fly species which serves as a primary indicator taxon to estimate minimal post mortem intervals. It is also a major research model in physiological and neurological studies on insect feeding. Previous studies have shown a sequence divergence of up to 4.3% in the mitochondrial COI gene between W European and N American P. regina populations. Here, we DNA barcoded P. regina specimens from six N American and 17 W European populations and confirmed a mean sequence divergence of ca. 4% between the populations of the two continents, while sequence divergence within each continent was a ten-fold lower. Comparable mean mtDNA sequence divergences were observed for COII (3.7%) and cyt b (5.3%), but mean divergence was lower for 16S (0.4-0.6%). Intercontinental divergence at nuclear DNA was very low (≤ 0.1% for both 28S and ITS2), and we did not detect any morphological differentiation between N American and W European specimens. Therefore, we consider the strong differentiation at COI, COII and cyt b as intraspecific mtDNA sequence divergence that should be taken into account when using P. regina in forensic casework or experimental research.
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Affiliation(s)
- Kurt Jordaens
- Royal Museum for Central Africa, Department of Biology (JEMU), Leuvensesteenweg 13, 3080 Tervuren, Belgium
- University of Antwerp, Evolutionary Ecology Group, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Gontran Sonet
- Royal Belgian Institute of Natural Sciences, OD Taxonomy and Phylogeny (JEMU), Vautierstraat 29, 1000 Brussels, Belgium
| | - Yves Braet
- National Institute of Criminalistics and Criminology, Vilvoordsesteenweg 100, 1120 Brussels, Belgium
| | - Marc De Meyer
- Royal Museum for Central Africa, Department of Biology (JEMU), Leuvensesteenweg 13, 3080 Tervuren, Belgium
| | - Thierry Backeljau
- University of Antwerp, Evolutionary Ecology Group, Groenenborgerlaan 171, 2020 Antwerp, Belgium
- Royal Belgian Institute of Natural Sciences, OD Taxonomy and Phylogeny (JEMU), Vautierstraat 29, 1000 Brussels, Belgium
| | - Frankie Goovaerts
- University of Antwerp, Evolutionary Ecology Group, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Luc Bourguignon
- National Institute of Criminalistics and Criminology, Vilvoordsesteenweg 100, 1120 Brussels, Belgium
| | - Stijn Desmyter
- National Institute of Criminalistics and Criminology, Vilvoordsesteenweg 100, 1120 Brussels, Belgium
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22
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Li F, Vensko SP, Belikoff EJ, Scott MJ. Conservation and sex-specific splicing of the transformer gene in the calliphorids Cochliomyia hominivorax, Cochliomyia macellaria and Lucilia sericata. PLoS One 2013; 8:e56303. [PMID: 23409170 PMCID: PMC3567074 DOI: 10.1371/journal.pone.0056303] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 01/10/2013] [Indexed: 01/16/2023] Open
Abstract
Transformer (TRA) promotes female development in several dipteran species including the Australian sheep blowfly Lucilia cuprina, the Mediterranean fruit fly, housefly and Drosophila melanogaster. tra transcripts are sex-specifically spliced such that only the female form encodes full length functional protein. The presence of six predicted TRA/TRA2 binding sites in the sex-specific female intron of the L. cuprina gene suggested that tra splicing is auto-regulated as in medfly and housefly. With the aim of identifying conserved motifs that may play a role in tra sex-specific splicing, here we have isolated and characterized the tra gene from three additional blowfly species, L. sericata, Cochliomyia hominivorax and C. macellaria. The blowfly adult male and female transcripts differ in the choice of splice donor site in the first intron, with males using a site downstream of the site used in females. The tra genes all contain a single TRA/TRA2 site in the male exon and a cluster of four to five sites in the male intron. However, overall the sex-specific intron sequences are poorly conserved in closely related blowflies. The most conserved regions are around the exon/intron junctions, the 3′ end of the intron and near the cluster of TRA/TRA2 sites. We propose a model for sex specific regulation of tra splicing that incorporates the conserved features identified in this study. In L. sericata embryos, the male tra transcript was first detected at around the time of cellular blastoderm formation. RNAi experiments showed that tra is required for female development in L. sericata and C. macellaria. The isolation of the tra gene from the New World screwworm fly C. hominivorax, a major livestock pest, will facilitate the development of a “male-only” strain for genetic control programs.
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Affiliation(s)
- Fang Li
- Department of Genetics, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Steven P. Vensko
- Department of Genetics, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Esther J. Belikoff
- Department of Entomology, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Maxwell J. Scott
- Department of Genetics, North Carolina State University, Raleigh, North Carolina, United States of America
- * E-mail:
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