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Development of 12 Microsatellite Markers in Dorcus Titanus Castanicolor (Motschulsky, 1861) (Lucanidae, Coleoptera) from Korea Using Next-Generation Sequencing

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Development of 12 Microsatellite Markers in Dorcus Titanus Castanicolor (Motschulsky, 1861) (Lucanidae, Coleoptera) from Korea Using Next-Generation Sequencing International Journal of Molecular Sciences Technical Note Development of 12 Microsatellite Markers in Dorcus titanus castanicolor (Motschulsky, 1861) (Lucanidae, Coleoptera) from Korea Using Next-Generation Sequencing Tae Hwa Kang 1, Sang Hoon Han 2,* and Sun Jae Park 3,* 1 Animal Resources Division, National Institute of Biological Resources, 42, Hwangyeong-ro, Seo-gu, Incheon 22689, Korea; [email protected] 2 Department of Life Science, College of Natural Science, Kyonggi University, 154-42, Gwanggyosan-ro, Yeongtong-gu, Suwon 16227, Korea 3 Biological Resources Research Department, National Institute of Biological Resources, 42, Hwangyeong-ro, Seo-gu, Incheon 22689, Korea * Correspondence: [email protected] (S.H.H.); [email protected] (S.J.P.); Tel.: +82-010-6243-9492 (S.H.H.); +82-010-2249-1763 (S.J.P.) Academic Editor: Kun Yan Zhu Received: 10 June 2016; Accepted: 15 September 2016; Published: 23 September 2016 Abstract: In the present study, we used next-generation sequencing to develop 12 novel microsatellite markers for genetic structural analysis of Dorcus titanus castanicolor (Lucanidae; Coleoptera), a popular pet insect in China, Korea, and Japan. We identified 52,357 microsatellite loci in 339,287,381 bp of genomic sequence and selected 19 of the loci based on their PCR amplification efficiency and polymorphism. The 19 selected markers were then tested for the presence of null alleles and linkage disequilibrium. We did not detect any evidence of null alleles; however, four pairs of loci (DT03 and DT11, DT05 and DT26, DT08 and DT26, DT26 and DT35) exhibited linkage disequilibrium. Thus, we assessed the genetic diversity of a D. titanus castanicolor population from the Daejeon region of Korea (n = 22) using 13 markers. Among them, one marker (DT17) deviated from Hardy-Weinberg equilibrium. Therefore, 12 markers may be useful for further analyzing the genetic diversity of D. titanus castanicolor. Keywords: Dorcus titanus castanicolor; microsatellite marker; HiSeq; next-generation sequencing; Lucanidae; Coleoptera; Korea 1. Introduction Dorcus titanus castanicolor [1] is a subspecies of stag beetle that is distributed in northeast China, Korea, and Tsushima Island, Japan [2–4] and is distinguished from the other subspecies by a distinctly bilobed clypeus and flattened last abdominal sternite in males and moderately punctured elytra and straight protibiae in females [4] (Figure1). In Korea, the subspecies is distributed throughout the country and is commonly found during local fauna and monitoring surveys [3,4]. Marketing campaigns from the insect industry have contributed to a rapid increase in the number of pet insects [5–7]. D. titanus castanicolor is a popular pet insect [7], and the rearing method of the subspecies is well documented [8]. In China and Japan, many stag beetle breeders have reared large-sized individuals of D. titanus [9]. Japan has 12 subspecies of D. titanus, which were interbred to select for large individuals. Consequently, four foreign subspecies (D. titanus platymelus, D. titanus pilifer, D. titanus palawanicus, and D. titanus titanus) were introduced to Japan without prior ecological assessment. Thus, ecological problems, such as decreases in the populations of native subspecies, have occurred, owing to competition with the introduced subspecies [9]. Int. J. Mol. Sci. 2016, 17, 1621; doi:10.3390/ijms17101621 www.mdpi.com/journal/ijms Int. J. Mol. Sci. 2016, 17, 1621 2 of 7 Int.populations J. Mol. Sci. 2016 of, 17native, 1621 subspecies, have occurred, owing to competition with the introduced2 of 7 subspecies [9]. FigureFigure 1. AdultAdult photos photos and and terminology terminology of Dorcus of Dorcus titanus titanus castanicolor castanicolor—left—, leftmale;, male; right,right female, female (Scale (Scalebar = 1.0 bar cm). = 1.0 cm). Recently, several Southeast Asian subspecies, such as D. titanus palawanicus, were introduced Recently, several Southeast Asian subspecies, such as D. titanus palawanicus, were introduced into into Korea. Kim and Kim [4] conducted a comparative analysis of the male genitalia through a Korea. Kim and Kim [4] conducted a comparative analysis of the male genitalia through a taxonomic taxonomic review of the Korean Lucanidae and reported that the Korean subspecies (D. titanus review of the Korean Lucanidae and reported that the Korean subspecies (D. titanus castanicolor) castanicolor) might actually be a distinct species. A different case was reported for Dorcus hopei [10]. might actually be a distinct species. A different case was reported for Dorcus hopei [10]. Thus, Thus, seven microsatellite markers were developed in order to help conserve the Korean seven microsatellite markers were developed in order to help conserve the Korean population and population and used to compare the genetic structure of the Korean Dorcus hopei with other used to compare the genetic structure of the Korean Dorcus hopei with other regional populations [11]. regional populations [11]. Recently, the Korean Quarantine Agency also used the markers for a Recently, the Korean Quarantine Agency also used the markers for a quarantine inspection of quarantine inspection of foreign Dorcus hopei. Therefore, the goal of this study was to develop foreign Dorcus hopei. Therefore, the goal of this study was to develop microsatellite markers for microsatellite markers for D. titanus castanicolor that could be used for population genetic analysis D. titanus castanicolor that could be used for population genetic analysis and origin testing. and origin testing. 2. Results and Discussion 2. Results and Discussion 2.1. Next-Generation Sequencing and Microsatellite Loci Identification 2.1. Next-Generation Sequencing and Microsatellite Loci Identification Through Illumina sequencing of D. titanus castanicolor genomic DNA, the number of contigs with lengthThrough >1000 bp Illumina was 123,291. sequencing The maximum of D. titanus length castanicolor was 103,231 genomic bp, and DNA, the mean the lengthnumber was of 2729contigs bp. Wewith obtained length 339,287,381>1000 bp was bp of123,291. genomic The DNA maximum sequence length with awas GC content103,231 ofbp, 38.98% and the (Table mean1). length was 2729 bp. We obtained 339,287,381 bp of genomic DNA sequence with a GC content of 38.98% (TableTable 1). 1. Summary of next-generation sequencing results from Dorcus titanus castanicolor genomic DNA. Number of Contigs Maximum Average Table 1. SummaryTotal of Basesnext-generation sequencingN50 results Length from Dorcus titanus castanicolorGC Content genomic(>1000 bp) DNA. Length Contig Length 124,291 339,287,381 103,231 3258 2729 33.98% Number of Contigs Maximum Average Total Bases N50 Length GC Content (>1000 bp) Length Contig Length Searching124,291 the genomic339,287,381 DNA sequence 103,231 yielded 52,357 microsatellite3258 loci2729 with 14,644 di-,33.98% tri-, and tetra-repeat sequence motifs, 186 penta-repeat loci, and 37 hexa-repeat loci. The relative frequencies of the specificSearching repeated the genomic sequences DNA were sequence as follows: yielded ATT, 24%;52,357 AAT, microsatellite 23%; AT, 8%; loci and with remaining 14,644 di-, motifs, tri-, belowand tetra-repeat 5% (Figure 2sequence). motifs, 186 penta-repeat loci, and 37 hexa-repeat loci. The relative Int. J. Mol. Sci. 2016, 17, 1621 3 of 7 frequencies of the specific repeated sequences were as follows: ATT, 24%; AAT, 23%; AT, 8%; and Int. J. Mol. Sci. 2016, 17, 1621 3 of 7 remaining motifs, below 5% (Figure 2). Figure 2.2. Frequency of short tandem repeats identifiedidentified inin thethe DorcusDorcus titanustitanus castanicolorcastanicolor genomicgenomic DNA sequence. The 14,64414,644 searched searched microsatellite microsatellite loci loci were were filtered filtered with twowith conditions. two conditions. First, the First, loci composed the loci ofcomposed AT repeat of wereAT repeat excluded were because excluded of difficultybecause of in difficulty PCR. Second, in PCR. the lociSecond, composed the loci of composed 24–96 bases of were24–96 selected. bases were Using selected. these twoUsing filtering these conditions,two filtering we conditions, selected 316 we microsatellite selected 316 loci,microsatellite and using loci, the primerand using design the softwareprimer design PRIMER3 software version PRIMER3 0.4.0 [12,13 vers], weion designed 0.4.0 [12,13], primer we sets designed for 301 loci.primer Eighty-five sets for markers301 loci. wereEighty-five selected markers based onwere the selected GC contents based of on the the product GC contents sequences of the and product melting sequences temperatures and ofmelting the designed temperatures primer of sets the and designed were subsequently primer sets and tested were for subsequently specificity and tested polymorphism. for specificity Finally, and 19polymorphism. markers were selectedFinally, and19 markers the forward were primers selected of eachand selectedthe forward loci wereprimers labeled of each with aselected fluorescent loci dyewere (FAM) labeled at with the 5’ a endfluorescent [14] (Table dye2). (FAM) at the 5′ end [14] (Table 2). TableTable 2.2. MicrosatelliteMicrosatellite markersmarkers selectedselected forfor genotypinggenotyping thethe 2222 DorcusDorcus titanustitanus castanicolorcastanicolor specimensspecimens fromfrom Daejeon,Daejeon, Korea.Korea. MSL Forward Sequence Reverse Sequence RM SS MN NAn 31,870MSL CGACACTCACACGCAATAAATAG Forward Sequence GCCATTCCATCGGTGAATTTTTA Reverse Sequence RM(CGTT)6 SS214 bp MNDT01 NAnKX268665 13,50831,870 CGACACTCACACGCAATAAATAGTGAAGTTTCAGAAGGAGTTTGGA
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