full issue - Association of Biotechnology and Pharmacy
full issue - Association of Biotechnology and Pharmacy
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Current Trends in <strong>Biotechnology</strong> <strong>and</strong> <strong>Pharmacy</strong>Vol. 5 (1) 1060-1063 January 2011. ISSN 0973-8916 (Print), 2230-7303 (Online)Factor XI Gene (Plasma thromboplastin antecedent) Deficiencyin Karan Fries CattleM. S. Azad, I. D. Gupta*, Archana Verma, Vikas Bohra, S. Rajesh Kumar <strong>and</strong>Kawardeep KourMolecular Genetics Lab, Dairy Cattle Breeding Division,National Dairy Research Institute, Karnal, Haryana -132001, India*For Correspondence - idgdcb59@yahoo.co.in1060AbstractThe PCR optimization for FXI gene Exon12 was found to be consistent <strong>and</strong> specific. PCRanalysis <strong>of</strong> FXI gene Exon 12 revealed single b<strong>and</strong><strong>of</strong> 244 bp in all the KF cattle studied. Nopolymorphism was detected at FXI gene exon 12<strong>of</strong> Karan Fries cattle. One non synonymousnucleotide change from G to A at position 105 inKaran Fries was observed when compared withBos taurus resulting into a change <strong>of</strong> amino acidin second codon from Arginine (R) in Bos taurusto Glutamine (Q) in Karan fries. The studyrevealed that the screened Karan Fries cattlewere free from Factor XI gene deficiency. Asthere was no polymorphism at FXI gene exon 12<strong>of</strong> Karan Fries cattle, it was not feasible to exploreassociation with repeat breeding.Key words:PolymorphismFXI gene, Karan Fries cattle,IntroductionFactor XI or plasma thromboplastinantecedent is the zymogen form <strong>of</strong> factor XI whichis one <strong>of</strong> the enzymes <strong>of</strong> the coagulation cascade.Like many other coagulation factors, it is a serineprotease. In humans, Factor XI is encoded bythe F11 gene. Factor XI (FXI) is produced by theliver <strong>and</strong> circulates as a homo-dimer in its inactiveform. FXIa along with FVIIIa are responsible forconversion <strong>of</strong> FX to its activated form FXa whichresults in conversion <strong>of</strong> prothrombin to thrombin.This reaction makes formation <strong>of</strong> fibrin clot (8)FXI gene <strong>of</strong> cattle is 19150 bp in length (17607721- 17626871 nt). It has 15 exons <strong>and</strong> 14 introns<strong>and</strong> is located on BTA 27.Studies done at international levelshowed that FXI gene deficient cattle were highlysusceptibility to infectious diseases, showedincreased frequencies <strong>of</strong> repeat breeding <strong>and</strong>lower rate <strong>of</strong> fetal <strong>and</strong> calf survival (2, 3, 7). FXIgene deficiency in cattle is caused by 76-bpinsertion <strong>of</strong> an imperfect poly-adenine (Poly-A)tract occurring at 188 bp position in exon 12[AT(A) 28TAAAG(A) 26GGAAATAATAATTCA].This insertion introduces a stop codon that resultsin a FXI protein lacking the functional proteasedomain encoded by exons 13, 14 <strong>and</strong> 15 (4, 8).Liptrap et al., (7) found that FXI-deficientCanadian Holstein cattle have 50% greaterprevalence <strong>of</strong> repeat breeding. FXI genedeficiency has been observed in Holstein cattlein Canadian USA, Polish <strong>and</strong> British herds. inCanada (2, 7), USA (8), Pol<strong>and</strong> (5), Britain (1),Japan (4), India (11), Turkey (9) <strong>and</strong> in JapaneseBlack cattle also (6, 10). As very little work hasbeen done on FXI gene deficiency on crossbredcattle in India, so the present study was carriedout to screen cattle <strong>of</strong> the National DairyFactor XI Gene Deficiency