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Localization and Activity of Rdna Genes in Tiger Beetles (Coleoptera: Cicindelinae)

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Localization and Activity of Rdna Genes in Tiger Beetles (Coleoptera: Cicindelinae) Heredity 74 (1995) 524—530 Received l7August 1994 The Genetical Society of Great Britain Localization and activity of rDNA genes in tiger beetles (Coleoptera: Cicindelinae) JOSÉ GALIAN*, JOSÉ SERRANO, PILAR DE LA RUA, EDUARD PETITP!ERREt & CARLOS JUANt Departamento de Biologia Animal, Facu/tad de Veterinaria, Universidad de Murcia, 30071 Murcia, Spain, tLaboratori de Genètica, Departament de Biologia Ambiental, Universitat de les I/los Ba/ears, 07071 Pa/ma do Mal/orca, Spain and 4Schoo/ of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK. Silverstaining of male meiotic nuclei of six species of the tiger beetle genus Cicindela (tribe Cicindelini), with multiple sex chromosomes, reveals the presence of active nucleolar organizing regions (NORs) in the sex vesicle. In one species, Cicindela melancholica, fluorescence in situ hybridization (FISH) with a ribosomal probe showed that rDNA genes are in one of the three X chromosomes and in the Y chromosome. Silver staining and FISH show that the related species Cicindela paludosa with a male XO system, has NORs located in one pair of autosomes. In Megacephala euphratica (tribe Megacephalini) these techniques indicate that NORs are located in three autosomal pairs but not in the single X chromosome of males. In all these species the nucleolus can be seen from the onset of meiosis to the end of the diffuse stage; it disappears from diplotene to the end of meiosis and appears again during the spermatid stage. From these results it is concluded that: (i) the nucleolus does not seem to play a major role in the pairing and association of the multiple sex chromosomes during first meiotic prophase and metaphase; (ii) the occurrence of NORs in the heterosomes of species having multiple sex chromosomes is thought to be an ancestral condition for the genus Cicindela; and (iii) changes of location of NORs from the heterosomes to the autosomes have occurred within species of this genus, at least in species showing extensive karyotypic repatterning. Keywords:Caraboidea,Cicindelinae, Coleoptera, FISH, NORs, rDNA. Introduction sents the parachute proper and the y chromosome the load, which is connected to the X by two tenuous Littleattention has been paid to the localization of threads (Smith & Virkki, 1978). Since the early state- nucleolar organizers (NORs) in Adephagan beetles, in ments of John & Lewis (1960) that the nucleolus is contrast to the studies concerning species of the large necessary for the Xyp to achieve regular co-orientation suborder Polyphaga (Drets et a!., 1983; Postiglioni & during metaphase I, there have been other results Brum-Zorrilla, 1988; Virkki eta!., 1990, 1991; Juan et which show that the sex bivalent does not have a at., 1993). Weber (1971) reported the occurrence of typical nucleolus, although an argyrophilous substance NORs in the largest autosomal pair of Cam bus is developed between sex chromosomes that may carry auronitens and C. granulatus, using light and electron out the functions postulated by John & Lewis microscopy. Secondaryconstrictionsindicating (Postiglioni & Brum-Zorrilla, 1988; Virkki eta!., 1990, possible NORs have also been reported in a number of 1991). other carabid species (Serrano, 1986; Serrano et a!., Tiger beetles are carabids belonging to the subfamily 1986; Galián et a!., 1990), but no specific methodology Cicindelinae which are characterized by the presence has been worked out for analysing the nucleolus. of multiple sex chromosomes and form a nonchias- Despite this, there is much debate about the role of matic multivalent (Giers, 1977) so they are suitable for the nucleolus in the association of the typical Xyp sex studying the localization of NORs and the role of the chromosomes of the suborder Polyphaga (see for nucleolus during meiosis. The generalized karyotype example Juan eta!., 1993). The sex-bivalent Xyp has a consists of nine to 12 autosomes plus Xj, where n parachute-like shape where the X chromosome repre- varies between 2 and 4 (Serrano, 1980; Serrano et a!., 1986; Serrano & Collares-Pereira, 1989, 1992; Galián *Correspondence eta!., 1990). Only two species show an X0 sex chromo- 524 1995 The Genetical Society of Great Britain. rDNA GENES IN TIGER BEETLES 525 some mechanism, probably of unlike origin: Mega- Chromosome preparations cephala euphratica (tribe Megacephalini) and Cicindela paludosa (tribe Cicindelini; Serrano eta!., 1986). Malegonads from adult beetles were used to obtain The introduction of fluorescence in situ hybridiza- mitotic or meiotic chromosomes and nuclei. Gonads tion (FISH) in many animal and plant species including were dissected from beetles anaesthetized by ethyl beetles, has allowed the localization and mapping of acetate. A 0.04 M sodium acetate solution plus 0.05 per specific DNA sequences on chromosomes as for cent colchicine solution was injected 1 h prior to dis- JOSÉ GALIAN*, JOSÉ SERRANO, PILAR DE LA RUA, EDUARD PETITP!ERREt & example rDNA genes (Juan eta!., 1993, and additional section. Gonads were fixed in fresh ethanol-acetatic references therein). FISH differs from silver staining in acid solution (3:1) for 1 h. Routine staining was carried Departamento de Biologia Animal, Facu/tad de Veterinaria, Universidad de Murcia, 30071 Murcia, Spain, tLaboratori de that it reveals the actual number of chromosomes out with acetic orcein for 10 mm and squashing. For Genètica, Departament de Biologia Ambiental, Universitat de les I/los Ba/ears, 07071 Pa/ma do Mal/orca, Spain and carrying NORs whereas silver staining indicates which silver staining small sections of the gonads were 4Schoo/ of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK. of these are active in a particular stage of the cell cycle. squashed in 45 per cent acetic acid and the coverslip Moreover, silver staining may indicate the presence of removed after freezing in liquid nitrogen. Slides were staining of male meiotic nuclei of six species of the tiger beetle genus Cicindela (tribe a nucleolar-like substance within chromosomes lacking dried in a 60°C hot plate. For in situ hybridization Cicindelini), with multiple sex chromosomes, reveals the presence of active nucleolar organizing a NOR. Thus, the Polyphagan beetle Misolampus small sections of the gonads were placed in eppendorff regions (NORs) in the sex vesicle. In one species, Cicindela melancholica, fluorescence in situ goudoti (family Tenebrionidae) does not have NORs in tubes with 20 uL of 60 per cent acetic acid, to break up hybridization (FISH) with a ribosomal probe showed that rDNA genes are in one of the three X the Xyp chromosomes in contrast to the related species the tissue giving a cell suspension. Drops of this chromosomes and in the Y chromosome. Silver staining and FISH show that the related species Tenebrio molitor, but in both species the sexual biva- suspension (5 4uL) were placed on preheated slides and Cicindela paludosa with a male XO system, has NORs located in one pair of autosomes. In lent is heavily silver-stained up to anaphase I (Juan et dried on a 60°C hot plate. Megacephala euphratica (tribe Megacephalini) these techniques indicate that NORs are located in a!., 1993). In this paper we applied silver staining and fluore- three autosomal pairs but not in the single X chromosome of males. In all these species the Silverstaining nucleolus can be seen from the onset of meiosis to the end of the diffuse stage; it disappears from scence in situ hybridization with a ribosomal probe to diplotene to the end of meiosis and appears again during the spermatid stage. From these results it is tiger beetles' germ cells to show the chromosomal Asolution of 20 per cent AgNO3 in distilled water concluded that: (i) the nucleolus does not seem to play a major role in the pairing and association of localization of rDNA genes, their relationship to pair- previously adjusted to pH 3.0 with formic acid was the multiple sex chromosomes during first meiotic prophase and metaphase; (ii) the occurrence of ing of multiple sex chromosomes and their phylo- used. The solution was kept in the dark for 15 mm with NORs in the heterosomes of species having multiple sex chromosomes is thought to be an ancestral genetic significance. occasional shaking and was thereafter centrifuged at condition for the genus Cicindela; and (iii) changes of location of NORs from the heterosomes to 13000 g for 5 mm to separate the silver previously the autosomes have occurred within species of this genus, at least in species showing extensive precipitated. A 100 4uL aliquot of the supernatant was placed on the slides and incubated at 70°C during 5—15 Materials and methods mm in a humid chamber. The slides were rinsed thoroughly in distilled water, counterstained with 2 per Material cent Giemsa in phosphate buffer pH 6.8, washed, air- The species sampled in the study were collected in the dried and mounted in Eukitt. sents the parachute proper and the y chromosome the localities of southeastern Spain listed in Table 1. load, which is connected to the X by two tenuous attention has been paidthreads (Smithto the & Virkki, localization 1978). Since the early state-of nucleolar organizers (NORs)ments inof John Adephagan & Lewis (1960) that beetles, the nucleolus in is suborder Polyphaga (Dretsnecessary et a!., for the 1983; Xyp to achieve Postiglioni regular co-orientation & Brum-Zorrilla, 1988; Virkkiwhich eta!., show that 1990, the sex bivalent 1991; does Juan not have et a at., 1993). Weber (1971)typical reported nucleolus, althoughthe occurrence an argyrophilous substance
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