Modified protocol for genomic DNA extraction from newly plucked feathers of Lophura leucomelana hamiltoni (Galliformes) for genetic studies and its endo-restriction analysis.
The White Kalij (Lophura leucomelana hamiltoni), is a pheasant found in forests and thickets, especially in the foothills, from the Indus River to western Thailand (McGowan and Panchen, 1994). Lophura leucomelana has nine sub-species and Lophura leucomelana hamiltoni is the species found in Pakistan (Johnsgard, 1999; 1986). The speciation pattern in genus Lophura is certainly the most complex of any in all pheasant groups, and has been cause of a vast number of species and subspecies being described, many of which have been based on single specimen (Johnsgard, 1986). The pheasants in Lophura are sexually dimorphic, with unremarkable and mimetic females, although, males also show cryptic plumages in some species. In previous literature, plumage trait has been used to conclude the evolutionary relationships and taxonomy of the pheasants (Johnsgard, 1986; Delacour, 1977). Onthe other hand, Kimball et al. (1999) demonstrated that most of these phenotypic traits were not diagnostic and might be evolved repeatedly and independently among the pheasants.
In previous literature it has been shown that the DNA was extracted from the mammals, which are often difficult to capture like bears, wolves, primates, elephants (Hausknecht et al., 2007; Schmaltz et al., 2006; McGrew et al., 2004; Eggert et al., 2003; Morin et al., 2001). Similarly, DNA has also been sampled from hair, faeces, urine, fish scales, shed snake skin, and egg shells (Hausknecht et al., 2007; Lucentini et al., 2006; Schmaltz et al., 2006; Eguchi and Eguchi, 2000; Nota and Takenaka, 1999; Goossens et al., 1998; Bricker et al., 1996; Tikel et al., 1996) and can widely be used for sex identification and genetic disease diagnosis, respectively. In the same way, in present research work the genomic DNA extraction was carried out from the newly plucked feathers of White Crested Kalij pheasant instead of blood that is necessary to diminish the stress on the birds because in case of juvenile birds and small parrots the blood vessels are in small size that makes the blood extraction very difficult (Natalia et al., 2001; Hauge, 1997; Alleman, 1996; Davidson et al., 1986).
The evolutionary relationships and the taxonomy of the subspecies of the silver and Kalij pheasants (Lophura nycthemera and L. leucomelanos; Phasianidae) are unclear. Delacour (1949) included them in a single superspecies, and pointed out the following systematic problems: (i) their description in a large number of genera before his revision, 49 taxa of silver and Kalij pheasants being split into 28 species belonging to four genera (Del Hoyo et al., 1994); (ii) their large geographical range with a limited number of specimens available to study; (iii) the occurrence of natural hybridization in contact zones where population of the two species of his new classification overlapped. Therefore, Delacour (1949) suggested that some subspecies could have derived from past episodes of hybridization. About 15 subspecies of L. nycthemera and nine subspecies of L. leucomelana are currently recognized (Johnsgard, 1999; Del Hoyo et al., 1994). Recently, it has been shown that the population of Kalij pheasants are going to decline from the foothills of Pakistan and no research work was done regarding to the social, biological and ecological behavior of foothill pheasants. On the other hand the number of adults and chicks of Kalij pheasant were grown in the Dhodial Pheasantry from 2000, to prevent the population of the Kalij pheasant.
On the basis of these critical points, some questions come up in mind that why the population of Kalij pheasants are going to be declined? Either it is an effect of hybridization or may be due to environmental effects? Are the silver pheasant species overlapping with the Kalij pheasants? So, in the current study, the newly plucked feathers of Lophura leucomelana hamiltoni, were collected and instead of blood were used first time as a source of genomic DNA in Biotechnology Lab., Department of Zoology, University of Azad Jammu and Kashmir (AJK), Muzaffarabad and we are trying to identify the genes that related to enhance the growth and the population of Kalij pheasant and to determine the evolutionary relationship among the silver and Kalij pheasant. Our goals were associated to, how much DNA can be recovered from the newly plucked feathers, optimization of DNA extraction method for feathers through electrophoretic technique, and to test the effects of feather type (size) on DNA yield.
Materials and Methods
Sampling. Feather samples of White Crested Kalij pheasant were collected from Pattika Captive Breeding Center and different sizes of 30 feathers were plucked. Fresh plucked and some old feather samples were stored in 100% absolute ethanol at room temperature for two weeks or at 4[degrees]C for two months to isolate high-quality genomic DNA and to avoid the DNA degradation and bacterial contamination (Randi and Lucchini, 1998; Gerloff et al., 1995, Taberlet and Bouvet, 1991).
DNA extraction. Before the isolation of genomic DNA the feathers were washed with 70% ethanol and later with [d.sub.3][H.sub.2]O. A 0.5 to 1 cm section was cut from the terminal portion of the feather calamus and placed in a 1.5 mL Eppendorf tube containing 5 mL of lysis buffer (50 mM Tris-HCl, pH 8; 20 mM EDTA, pH 8; 2% sodium dodecyl sulfate; and 175 mg/mL proteinase K). Lysis temperatures and incubation times were different i.e at 37[degrees]C to 55[degrees]C, depending on the feather size for overnight to several hours with gentle shaking (Nattalia et al., 2001). After the lysis step, samples were vigorously vortexed to homogenize the lysate and then centrifuged at 13,000 rpm for 10 min if non digested soft tissue was present. The supernatant was transferred to a clean 1.5 mL Eppendorf tube, and DNA was purified with 500 [micro]L of phenol: chloroform: isoamyl alcohol (25: 24:1). Subsequently, 50 mL of 2 M NaCl and 2 volumes of 100% absolute ethanol were used to precipitate the genomic DNA. To maximize DNA recovery, this step can be performed at -20[degrees]C for overnight. Next day DNA recovery was taken by centrifugation at 13,000 rpm for 10 min. The DNA pellet was washed in 70% ethanol. The pellet was finally air dried and re-suspended in [d.sub.3][H.sub.2]O and stored at -20[degrees]C.
Agarose gel electrophoresis. Isolated DNA was analyzed by 2% (w/v) gel in a small electrophoresis apparatus (6x10x0.5 cm). 0.5 g of agarose (Eurogentec) was melted in 50 mL of 1X TBE buffer (55 g of Boric acid, 1 M of EDTA, 108 g of Tris per liter of distilled water (Andleeb et al., 2010a; 2010b) in a microwave oven until a clear, transparent solution was achieved. After cooling to about 60[degrees]C, 0.01% (w/v) ethidium bromide was added. The melted agarose was poured into a flat bed gel tray. An appropriate comb was selected for forming the sample wells in the gel. The gel was allowed to set completely at room temperature. The comb was carefully removed and the gel tray was placed in an electrophoresis tank containing sufficient 1X TBE buffer to just cover the gel. DNA samples were mixed with 1/6 volume (v/v) of 6X DNA loading buffer. The DNA samples were loaded into the wells of the solidified gel submerged in 1X TBE and gel electrophoresis was carried out at 50-100 volts until the required DNA separation was achieved. The DNA bands in the gel were visualized using short wave ultraviolet light provided by a trans-illuminator and photographed using a digital camera (EOS 350D; EF-S 18-55, Kit).
Phenol chloroform treatment. The genomic DNA was diluted with [d.sub.3][H.sub.2]O to 100 [micro]L. An equal volume of phenol and chloroform (1:1) was added. The mixture was shaken gently and centrifuged for 6 min. The supernatant was taken into a fresh Eppendorftube and 1/10th volume of 3 M sodium acetate (10 [micro]L), pH 5.4 and 2.5 volume of absolute ethanol (250 [micro]L) were added. The mixture was placed at -20[degrees]C for 1 h and then centrifuged for 10 min. The supernatant was discarded and the pellet was washed with 70% ethanol. The mixture was centrifuged for 2 min, the supernatant was removed and the pellet was air dried. Finally the pellet was dissolved in 20 [micro]L [d.sub.3][H.sub.2]O.
DNA quantification method. A spectrophotometric measurement of the amount of UV irradiation absorbed by nucleic acid (DNA or RNA) is very simple and accurate method. For the spectrophotometric measurement 1 [micro]L of isolated DNA was diluted with 99 [micro]L of distilled water and the readings taken at a wavelength of 260 and 280 nm in the sample.
Restriction analysis of isolated genomic DNA. The digestion of genomic DNA was achieved by single and double digestion methods by using specific Pst 1, BamHI and HindIII restriction enzymes and their buffers in accordance with the supplier's (Vivantis) guidelines. For restriction, the 20 [micro]L reaction mixture contained ~1 [micro]g of the genomic DNA and 10 units of restriction enzyme(s) in 1X or 2X reaction buffer. The restriction was done by incubating the mixture at 37[degrees]C (some restrictions enzymes used a slightly different temperature) for overnight. The results of restriction enzyme digestions were examined by electrophoresis on 1% agarose gel.
Photography and manipulation. A digital camera (EOS 350D; EF-S 18-55, Kit) was used to photographs in the field as well as in the Biotechnology Lab. The same camera was used to take photographs of DNA under ultraviolet (UV) light using a hand held UV lamp (UV semiconductor inspection lamp products, upland, CA; Black Ray model B 100AP). The photographs were manipulated with Adobe Photoshop CS and Microsoft office picture manager. The figures were produced using CorelDraw 12 and Microsoft Office Powerpoint 2007.
[FIGURE 1A-1B OMITTED]
Results and Discussion
For the large feathers, lysis was performed at 37[degrees]C for overnight with gentle shaking and small feathers were incubated at 55[degrees]C for overnight to several days without shaking (Natalia et al., 2001). It was observed that the incubation period of 55[degrees]C for 3 to 4 days showed better results of feathers lysis as compared with the 37[degrees]C for overnight with gentle shaking because the lysis buffer effectively solubilizes the cellular proteins but does not liberate genomic DNA (Table 1).
After the lysis step, DNA was purified with phenol: chloroform: isoamyl alcohol (25:24:1) and in later the aqueous phase was treated twice time with phenol: chloroform (25:24) to purify the genomic DNA (Table 1). Subsequently, the maximum recovery of genomic DNA was obtained by using 50 [micro]L of 2M NaCl and double volumes of 100% absolute ethanol at -20[degrees]C for overnight as compared to the 3 M sodium acetate and propanol. RNAse (0.1 mg/mL) digestion step was also required for 2-3 h at 37[degrees]C in case of large feather or if it contained soft tissue and blood (Natalia et al., 2001; Hauge, 1997; Alleman, 1996; Davidson et al., 1986). It was also noted that the combinations of proteinase K, CTAB, and repeated extractions with chloroform/isoamyl alcohol were able to remove a substantial amount of contaminating material, especially polysaccharides and proteins, resulting in reliable DNA bands (Fig. 1A and 1B and (Table 1). The total amount or quantity of the 50 [micro]g genomic DNA was measured at [OD.sub.260nm] by the absorption of ultra-violet (UV) light by the ring structure of purines and pyrimidines and the quality of the extracted DNA was analyzed through agarose gel electrophoresis (Fig. 1A and 1B). The significant amounts of high-quality genomic DNA approx. (50 [micro]g) along with the small amounts of non degraded genomic DNA was isolated from the subspecies, White Crested Kalij pheasant (Fig. 1A and 1B). Moreover, DNA isolated from newly feathers was successfully used to assess the quality of the double stranded DNA through single and double endo-restriction analysis by using specific enzymes Pstl, BamHI and HindIII (Vivantis) at 37[degrees]C for overnight. Examination of the reacted DNA with single restriction enzyme was observed by 2% agarose gel electrophoresis and indicated the complete cleavage, as seen by disappearance of the genomic DNA band and uniform smear of cleaved DNA (Chapaval et al., 2008; Saiki et al., 1985), (Fig. 2A-2D). On the other hand when two restriction enzymes were used in combination then incomplete digestion was observed (Fig. 2C). Similar results were also observed when genomic DNA was treated with only BamHI (Fig. 2D). The protocol described here has the advantage that the quantity and quality of the DNA preparation can be easily visualized by agarose gel electrophoresis and ethidium bromide staining because the DNA yield is of sufficient quantity and the DNA remains double stranded.
[FIGURE 2A-2D OMITTED]
Results shows that the newly described method of DNA extraction is a rapid, simple, useful and reproducible method for small scale isolation of high quality of genomic DNA from the fresh or newly plucked feathers for the purpose of evolutionary relationships and other genomic investigations. This extracted genomic DNA will be used as a template for the polymerase chain reaction to isolate the growth promoting gene, for the sequence analysis and the finding of phylogenetic relationship among these Galliformes in future project. Finally, the modified protocol increase laboratory efficiency and safety.
Authors are thankful to Department of Wildlife and Fisheries of Azad Jammu & Kashmir for their help in sample collection from Captive Breeding Center Pattika, Muzaffarabad for the current study.
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Saiqa Andleeb (a) *, Sara Shamim (a), Muhammad Naeem Awan (b) and Riaz Aziz Minhas (a)
(a) Department of Zoology, University of Azad Jammu and Kashmir, Muzaffarabad, Pakistan
(b) Program for Mountain Areas Conservation (PMAC), Regional Office Muzaffarabad, AJK--13100, Ministry of Environment, Pakistan
(received July 26, 2011; revised February 2, 2012; accepted April 26, 2012)
* Author for correspondence; E-mail: email@example.com
Table 1. Comparison of genomic DNA extraction methods Lane no. Feather Incubation Lysis 2% on agarose size period temperature CTAB gel Agarose gel A 1. Medium Several days 55[degrees]C Yes 2. Medium Several days 55[degrees]C Yes 3. Medium Several days 55[degrees]C Yes 4. Medium Several days 55[degrees]C Yes 5. Medium Several days 55[degrees]C Yes Agarose gel B 1. Medium 24h 37[degrees]C No 2. Medium 24h 37[degrees]C No 3. Medium 24h 37[degrees]C No 4. Medium 24h 37[degrees]C No 5. Medium 24h 37[degrees]C Yes 6. Medium 24h 37[degrees]C Yes 7. Medium 24h 37[degrees]C Yes 8. Control Bromophenol blue loading dye 9. Medium 24h 37[degrees]C No 10. Medium 24h 37[degrees]C No 11. Medium 24h 37[degrees]C No 12. Medium 24h 37[degrees]C No 13. Medium 24h 37[degrees]C No 14. Medium 24h 37[degrees]C No 15. Medium 24h 37[degrees]C No 16. Control Bromophenol blue loading dye Lane no. Mode of 3M sodium on agarose shaking acetate and propanol Agarose gel A 1. Gentle shaked Both 2. Gentle shaked Both 3. Gentle shaked Both 4. Gentle shaked Both 5. Gentle shaked Both Agarose gel B 1. Not shaked Propanol 2. Not shaked Propanol 3. Not shaked Propanol 4. Not shaked Propanol 5. Gentle shaked Propanol 6. Gentle shaked Propanol 7. Gentle shaked Propanol 8. 9. Not shaked 3M sodium acetate 10. Not shaked 3M sodium acetate 11. Not shaked 3M sodium acetate 12. Not shaked 3M sodium acetate 13. Not shaked 3M sodium acetate 14. Not shaked 3M sodium acetate 15. Not shaked 3M sodium acetate 16. Lane no. Mixture of Quality of on agarose solvents extracted DNA Agarose gel A 1. A&B Good 2. A&B Good 3. A&B Good 4. A&B Poor 5. A&B Good Agarose gel B 1. A Poor 2. A Poor 3. A Not detected 4. A Poor 5. A Good 6. A Not detected 7. A Good 8. 9. B Poor 10. B Poor 11. B Not detected 12. B Not detected 13. B Not detected 14. B Poor 15. B Poor 16. A: phenol: chloroform: isoamyl alcohol (25:24:1); B: phenol: chloroform (25:24)
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|Author:||Andleeb, Saiqa; Shamim, Sara; Awan, Muhammad Naeem; Minhas, Riaz Aziz|
|Publication:||Pakistan Journal of Scientific and Industrial Research Series B: Biological Sciences|
|Date:||Jul 1, 2012|
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