Phylogenetic Analysis Of Major Fresh Water Carps Of Pakistan Through DNA Barcoding
Material type: Book ; Literary form:
Publisher: 2014 Dissertation note: Pakistan is bestowed with the land of geological and topographic diversity. The ecological variation is uniformly reflected in all water lands of the country. Pakistan has significantly huge natural inland water resources in the form of ocean, rivers, networks of canals and lakes (Mirza and Rafique 1994). The country is blessed with one of the largest freshwater resources in the world correspondingly large number of freshwater living vertebrates is available from which fishes are quite significant considering the ecological balance and its consumption as food. It is one of the food sources which solely provide all the essential nutrients, minerals and high quality protein which is not common from other food items (Muhammad Rafique 2007). Out of 33,100 fish species identified worldwide as per Fish Base organization report published in April 2015 (http://www.fishbase.org). Out of 233 (indigenous and exotic) freshwater fish species, 78 economically important indigenous fish species are available in the water bodies of the Pakistan. According to this report fishes are the largest vertebrate group, constituting about 50% of all vertebrate species. Systematically fishes are widely spread in nature, ranging from prehistoric jawless fishes to cartilaginous fishes and also from old to current day bony fishes. The taxonomic placement of these fishes shows their belonging to class Actinopterygii, sub-class Teleostei, 3 cohorts, 6 superorders, 13 orders, 30 families and 86 genera (Rafique 2007; Rafique and Khan 2012).
Demand of fish is increasing day by day not only being the naturally available source of food rather the health benefits associated with its consumption. This necessitates to develop a more efficient and sustainable system to increase their growth. DNA based technologies are being competently employed in aquaculture production fields for pedigree information.
Moreover, tagging each fish individually is not an easy task so these DNA based methods help in avoiding intrusion of environmental factors which may result from raising fish families in separate reservoirs (Martinez 2007). Fish identification has been traditionally based on phenotypic features. However, due to high multiplicity and morphological similarity, in many cases, fish at its different developmental stages are hard to be identified by relying only on morphological characteristics (Victor et al. 2009).
For phylogenetic studies of the animals the use of mt-DNA is very common and reliable compared to nuclear DNA due to its high evaluation capabilities, which results in gathering of differences even between closely related species (Moore 1995; Mindell et al. 1997).“Bar-coding gap" is the name given to the property that is inter-specific variation in this region is markedly higher than intra-specific variability (Hebert et al. 2003).
Approximately each and every animal contain 13 protein-coding genes (PCGs) as an essential component of their mt-genome (mitochondrial genome), which helps in encoding of several proteins responsible for the oxidative phosphorylation machinery (Richly A et al. 2004, Song H et al. 2008). Being maternally inherited, mt-DNA is better as compared to genomic DNA such as quick evolution, less exposure to recombination, high copy number, high conservation, little duplications and negligible intergenic regions (Waugh J 2007, Xu J 2005). Clonal inheritance is the main property which makes it more worthy and suitable marker in comparison with other available molecular bio-diversity tools (Galtier et al. 2009).
DNA barcoding is one of the taxonomic tools. It is being used to distinguish animal species based on the small segment of their genome such as mitochondrial DNA, designated as an identification tag or barcode of particular species (Herbert et al. 2003). Identification of species using DNA barcoding is quite debatable. Still many researchers consider it as a reliable
basic tool to ascertain the genetic characterization of diverse eukaryotic species, especially after establishment of the Consortium for the Barcode of Life (CBOL) in 2004 [http: //www. barcodeoflife.org/].
Ideally DNA barcoding should provide quick, reliable and cost effective species identification, even to those user who has little or negligible knowledge of taxonomy (Herbert et al. 2003, Hajibabaei M et al. 2005, Herbert et al. 2005). Identification of unknown source is possible by using distance based tree which can be created by comparing unidentified sequences against retrieved known sequences of different species (Hebert et al. 2003, 2004a, 2004b). DNA barcoding identification system has been recognized universally as standardized method to recognize species and unveil their genetic diversity (Herbert et al. 2003; Herbert et al. 2004). The ideal DNA barcoding is robust, with conserved, universal primer binding sites, reliable DNA amplification and sequencing.
From whole mitochondrial genome, Cytb (Cytochrome b) is considered as one of the most promising gene due to its function and structure, even it is composed of both conserved and rapidly evolving regions which are more related to evolutionary studies (Farias et al. 2001). To identify unknown or ambiguous species it is considered more reliable as it contain sequences which provide the specific information about particular species (Parson W et al. 2000a, 2000b). It is also one of the most useful genetic marker to identify the linkage within families and genera (Meyer 1994; Teletchea 2009). Cytb gene is involved in comparative studies which results in development of new classification schemes and been used to assign a genus to a newly described species as well as improve the understanding of evolutionary relationships of genra (Castresana 2001).
One of the core objectives of this study is to identify and classify four freshwater indigenous fish species of Pakistan, which includes Labeo rohita (Rohu), Labeo calbasu (Calbans), Catla catla (Thalla) and Cirrhinus mrigala (Mori) using Cytb gene. Morphologically, Labeo rohita shows compressed body with convex dorsal profile while mouth bears a pair of barbells and fins are gray and orange in color. Catla catla shows compressed body with broad head. Mouth is wide with thick lower lip. Labeo Calbasu`s dorsal profile is more convex than that of abdomen and two pairs of barbells are present on fringed upper lip. Cirrhinus mrigala has elongated and streamlined body shape which is grayish and silver in color (Bhuiyan AL 1964; Rahman AK 1989). All of these species are found in freshwater bodies mostly lakes, rivers and ponds except Labeo calbasu which is a bottom dweller. These fishes are harvested by using rod and line or by using nets (Talwar PK and Jhingran AG 1991). These fishes are known as major carps and economically very important for the country due to their high consumption as food. These fishes are also used for fish farming due to their greater muscle mass thus also possess very high commercial value for fish farming business.
Another objective of this study is to resolve the taxonomic anomalies related to above mentioned species. Selling of fish meat in mislabeled packaging is a serious issue now days. Most commonly Hypophthalmichthys molitrix (silver carp) and Ctenopharyngodon idella (grass carp) are sold under the label of Labeo rohita. DNA barcoding is also helpful in detecting such fraudulent mislabeling.
It would be the first study in Pakistan to genetically characterize commercially important fish species. It would help scientists to know about their phylogenetic and taxonomic status and also assist fish fanciers to genuinely identify their species of interest. Identification of fish species is also important for conservation of biodiversity as it helps in preservation and
identification of endangered species by generating their barcodes from even minimal evidence available. This study has paved the way for molecular biologists to study taxonomic ambiguities at sub species level using SNP (Single nucleotide polymorphism) based identifying marker.
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Genetic Characterization Of Pakistani Wild Quails Using Mitochondrial Coi Gene
Material type: Book ; Literary form:
Publisher: 2015 Dissertation note: A latest taxonomic tool termed as DNA barcoding is being used to genetically characterize animals. DNA barcoding is helpful in determining evolutionary relationship among species. Being a small sized genome and agile enough to show rapid mutation, mtDNA has been used as a pertinent marker of molecular biodiversity. DNA barcode works as an efficient tool in food manufacturing industry, diet investigation, forensics analysis, preventing unlawful trade and felonious poaching. The aim of this study was to develop DNA barcode for genetic characterization of Pakistani wild quail. Pakistani wild quail is important due to its demand for eggs, meat production, experimental purposes and gaming as well. Japanese quail was also included in this study because this quail is excessively produced in Pakistani farms. Japanese quail is present throughout the year and is comparatively bigger in size than wild quail. It has longer lifespan; farmers can easily breed this species in farms. It is suitable in poultry due to better meat yield.
COI gene (500bp) was used as a molecular marker for identification at species level. DNA was extracted from blood samples of ten wild quails (Coturnix coturnix and fifteen japanese quails (Coturnix japonica). Reported bird universal primers were used to amplify COI region from the extracted mtDNA samples using PCR. Amplicon were then sequenced by Sanger sequencing method (Sanger et al. 1977). Forward and reverse DNA Sequences were aligned with the reference sequence using nucleotide BLAST on NCBI to observe the dissimilarity among the sequences. Consensus sequences generated were used to construct their phylogenetic tree to see their evolutionary relationship with other bird species. Japanese quail which is thought to be domesticated from Japan, its Pakistani population showed close relation with sequences
generated in Japan for this particular species. Pakistani wild quail species showed its closest linkage with C. coturnix.
In conclusion, COI barcode proved as an authentic tool for species identification and phylogenetic inference of Pakistani wild and farm grown quails. Wild quail species has been characterized using partial COI gene sequences. This study has provided a specific genetic marker which can differentiate Japanese quail from wild quail at molecular level as most of the time both species are confused with each other. It can be helpful to the farmers and bird fanciers because they can select the birds of their choice correctly. This is the first study reporting DNA barcode of this Pakistani quail species. It would help researchers to study about phylogenetic and taxonomic status and also assist quail fanciers and quail farmers to unaffectedly identify their species of interest in farming. Identification of quail species is also important for conservation of biodiversity as it helps in preservation and identification of endangered species by generating their barcodes from even minimal evidence available.
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Comparison Of Antifungal Activity Of Human Salivary Histatin Between Diabetic And Nondiabetic Individuals
Material type: Book ; Literary form:
Publisher: 2015 Dissertation note: Histatins are antimicrobial proteins found in human saliva. These proteins have also been
observed to have the ability to aid in wound healing in various organisms. The genes HTN1 and
HTN3 have been studied to govern these proteins. Histatin proteins have a vast array of
antimicrobial properties. While a fungus, Candida albicans or C. albicans is a part of the human
normal gut flora, it is a threat to people who have a compromised immune system. An
overgrowth of the fungi belonging to the Candida family leads to candidiasis in humans, and oral
candidiasis has been reported to a large extent namely in diabetic patients. The antifungal
activity of histatin proteins laid the basis of the current research work.
In this study, the antifungal activity of saliva from a total of 64 healthy and diabetic
human samples against Candida albicans has been evaluated. The samples of both healthy and
diabetic human samples belong from different age ranges: 15-25, 25-35, 35-45 and 45-55 years
in order to change in antifungal activity with respect to age of an individual. Antifungal activity
was observed through both agar well and agar disk diffusion methods, with agar disk diffusion
methods showing positive results. According to the outcomes of this study at least 120μL of
healthy saliva sample is required to create a zone of inhibition. Saliva from diabetic individuals
showed no antifungal results.
This occurrence led to the next part of this study involving amplification of HTN3 gene.
The nucleotide sequences of both healthy and diabetic individuals were compared together and
showed that the absence of antifungal activity in diabetic individuals might have reasons other
than a genetic one, according to this study. The results observed from the present study indicate
that healthy human saliva possesses antifungal activity against Candida albicans. In accordance
to these results, the naturally occurring antimicrobial activity of histatin proteins present in
human saliva can have immense use in the field of medicine.
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Mutational Screening Of The RB1 Gene In Pakistani Patients With Retinoblastoma
Material type: Book ; Literary form:
Publisher: 2015 Dissertation note: Retinoblastoma is a neonatal intraocular tumor caused by biallelic inactivation of RB1 gene. Rb
patients and asymptomatic carriers undergo a series of clinical tests for diagnosis and tumor
treatment. These clinical examinations prove to be expensive and time consuming. On the other
hand if the proband’s RB1 gene mutation status is determined by genetic testing, it can prove as
more significant and cost effective diagnostic methods. Secondly, only those asymptomatic or at
risk carriers with the mutation, require clinical surveillance while those proven to be unaffected
do not require additional clinical examinations. Furthermore early diagnosis of Rb by molecular
testing can enable and enhance clinical management, earlier treatment, follow-up care, carrier
screening, genetic counseling, prenatal diagnosis and reproductive planning in predisposed
families. Irrespective of the importance of molecular testing of Rb patients, in Pakistan only a
few clinical reports on Rb are available so, there was a dire need to find RB1 mutations in
Pakistani Rb patients and to set a molecular based diagnosis for poor affected families. Keeping
in view the importance of molecular diagnosis, in this study a reliable genetic test has been
developed to detect the RB1 germline mutations in Pakistani Rb patients.
During this study, 70 Rb patients including 38 unilateral and 32 bilateral cases were enrolled,
from different regions of Pakistan. By using direct sequencing method, seven novel and twelve
reported RBI mutations were found. The novel mutations included three frameshift mutations
(c.1116_1119delCACT in exon 11, c.1436_1437delAC in exon 16 and c.2060_2061insTCATT
in exon 20) and four substitutions (c.148G>T in exon 2, c.610G>T in exon 2, g.94G>C in exon
7, c.947A>T in exon 10 and g.1991G>C in promoter region) while twelve reported mutations in
22 patients included, 9 substitutions (c.160G>T in exon 2, c.289G>T in exon 3, c.751C>T in
exon 8, c.920C>T in exon 9, c.967G>T in exon 10, c.1072C>T in exon 11, c.1654C>T in exon
17, c.2063T>C in exon 20 and c.2359C>T in exon 23), one frameshift mutation (c.772_776del in
exon 8) and two splice site mutations (c.380+1G>T and c.1215+1G>A in intron 3 and 12
respectively). Mutation detection rate was found to be 77.8% in (7/9) bilateral familial, 50% in
(2/4) unilateral familial, 56.5% in (13/23) bilateral sporadic and 14.7% in (5/34) unilateral
sporadic patients while overall rate of mutations in bilateral and unilateral patients was detected
as 62.5% (20/32) and 18.4% (7/38) respectively. Beside mutations one novel c.940-64C>T
(intron 9) and nine reported intronic variants c.380+45 C>T (intron 3), c.501-77G>A (intron 4),
c.1128-72T>G (intron 11), c.1695+99A>T (intron 17), c.1695-1696delAA (intron 17), c.1815-
104A>G (intron 18), c.1961-10T>C (intron 19), c.2663+33T>C (intron 25) and c.2664-10T>A
(intron 25) were also found. Carrier screening facility was also provided to six asymptomatic
siblings (as possible carriers) of familial proband but none of them was found to be diseased.
Hopefully, in future the findings and developed protocol of this study will help to reveal the
molecular basis of Rb in Pakistani Rb patients which additionally help to secure vision and life
of Rb patients. Further, in Pakistan there is dire need to develop “National Rb Registry Centre”,
to register all new Rb cases for finding incidence rate and prevalence of Rb in Pakistan. Beside
this other related issues like financial constraints, health education, planning and awareness
about Rb, occupational training for health providers, capacity building for neonatal
ophthalmologic screening and cosmetic rehabilitation for surviving Rb patients are important and
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Genetic Identification And Molecular Classification Of Sub-Family Phasianinae Of Pakistani Bird Species Through Dna Barcoding
Material type: Book ; Literary form:
Publisher: 2015 Dissertation note: DNA barcoding is a precise technique that uses molecular genetics tools for accurate identification, categorizing, relating and separating the phylogenies of species. Being a small sized genome and agile enough to show rapid mutation, mtDNA has been used as a pertinent marker of molecular biodiversity.The aim of this study was to develop DNA barcode for genetic characterization and classification of Sub-family Phasianinaeof Pakistani bird species. Theyhave not been genetically identified yet in Pakistan. It includes birds like domestic chicken(Gallus gallusdomesticus), aseel chicken(Gallus gallusdomesticus strain),blue peafowl(Pavo cristatus), green peafowl (Pavo muticus), white peafowl (Pavo cristatus leuticus), Kalij pheasant (Lophura leucomelanos),monal pheasant (Lophophorus impejanus),koklass pheasant(Purcrasia macrolopha), ring necked pheasant (Phasianus colchicus), Tragopan (Tragopan melanocepals) andred junglefowl (Gallus gallus). These birds are considered an important part of an ecosystembecause they play a significant role in seed dissemination, pollination of plants and disease spread which are the basic constituents of an ecosystem. They are used for food, hunting and entertainment purposes.
Mitochondrial geneCytochrome c oxidase subunit 1 (CO1)of 500bps was used as a marker for identification at specie level.Genomic DNA was extracted by each blood and tissue sample of eleven bird species (33 samples). Amplification of CO1 gene was a done by using a universal set of primers (BIRDF1 and BIRDR1)containing region of almost 750 bps (Hebert et al. 2003).Amplicons were purified and sequenced Sanger sequencing method (Sanger et al. 1977). Forward and reverse sequences were analyzed using softwaresEMBOSS merger,ClustalW, BioEdit and nBLAST. Phylogenetic analysis of selected bird species was done. Each sequence was aligned
with its reference sequences of CO1 gene present on NCBI. Every nucleotide position which did not align with the reference sequence was studied to identify SNPs. Fixation index (FST) were used to measure species diversity within a same sub population relative to that found in the entire population. Consensus sequences (500bps) generated was used to construct their phylogenetic tree to see their evolutionary relationship with other bird species. All species showed their closest linkage with their respective species. Pakistani population of peafowl and chicken species showed the close relation with same sequences generated in China. Tranopans showed its closest linkage with T. temminckii.
In conclusion, seven species ofPhasianinaesub-family of Pakistani bird species was genetically characterized first time in Pakistan by using CO1 as a barcode. It proves that DNA barcoding is an efficient and accurate molecular tool for species identifica¬tion and phylogenetic implication. This study leads to establish a DNA Data Bank that helped scientists to investigate the biodiversity, taxonomic classification, specie identification, in forensic purposes and to study the genetic and phenotypic evolution of these species. DNA barcoding through CO1 gene works as a functional tool for detectingmeat mislabeling and preventing illegitimate trade. This study has established foundations for molecular biologists to study taxonomic uncertainties at sub species level using SNP based identifying marker. It helps in preservation and identification of endangered species by generating their barcodes from even minimal evidence available.
Availability: Items available for loan: UVAS Library [ Call number: 2376-T] (1).
Molecular Characterization of Pakistani Common Leopard
Material type: Book ; Literary form:
Publisher: 2015 Dissertation note: CD not available.
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