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핵이식을 통한 양서류 역위배세포의 발생수행능력에 관한 연구
정해문,이자경,김덕희 한국유전학회 1987 Genes & Genomics Vol.9 No.1
In order to investigate the mechanism of early amphibian embryogenesis, the uncleaved eggs of Korean anuran Rana dybowskii were inverted at various times as well various duration after fertilization. However, developmental arrest at early gastrula stage always followed partial invagination of the dorsal lip. Nuclear transplantation was then employed to reveal the cause of death. Comparing the developmental capacity of the endodermal cells of inverted R. dybowskii and those of non-inverted normal control embryos, there was no difference between those two cases. It was concluded that the death of the inverted embryos was not attributed to the endodermal cells and the cause should be found elsewhere. Nuclear transplantations were also carried out to investigate the extent of development by newly injected nuclei from normal embryos. For that purpose nuclei from the cells at various developmental stages of blastula, gastrula, neurula and tail bud stages were injected into the eggs whose nuclei had been previously eliminated. It was revealed that as cells differentiated their nuclei progressively restricted in their ability to promote the development of enucleated eggs. The results are quite similar to those early observations by other investigators who used other amphibian species.
$3CaO.SiO_2$ 생성 반응과 미세조직에 미치는 $K_2SO_4$와 $Na_2SO_4$의 영향
정해문,한기성,최상흘 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.10
Effects of K2SO4 and Na2SO4 on C3S formation and its microstructure were investigated. C3S formation was not influenced by addition up to 6.0wt% of K2SO4 as SO3 base, however it was prevented by only 1.0wt% of Na2SO4 addition. C3S prevention by added Na2SO4 was the reason why C2S stabilized by Na+ and SO42- could not react to C3S. Added K2SO4 appeared as K2SO4, however added Na2SO4 appeared as the form of Na2xCa3-xAl2O6, (Na0.8Ca0.1)SO4 and Na2SO4 in interstitial phase.
Xenopus laevis 의 초기 발생에서의 Xc - myc protooncogene 의 발현 양상
정해문,이경종 한국유전학회 1994 Genes & Genomics Vol.16 No.1
Temporal and spatial expression pattern of Xc-myc protoocogene was studied in the early development of Xenopus laevis. The myc mRNA is localized in animal hemisphere of early stage embryos. From the gastrula stage Xc-myc gene is expressed, mainly in dorsal area and the expression of the gene is maintained persistantly in neuroectoderm and epidermis. After tailbud stage, strong expression of Xc-myc gene is observed in several developing tissues and organs originated from ectoderm and mesoderm, such as central nervous system, optic cup, lens placode, otic placode, gill bud, cement gland as well as in the somite and epidermis. However no expression was observed in the endoderm at every developmental stage. Animal cap and equatorial zone of blastrulae, in additiort to ectoderm and mesoderm of exogastrulae showed that the expression was occurred these areas regardless of the presence of inductive activity. These observations suggest that the expression of Xc-myc protooncogene plays important roles in the development of ectodermal and mesodermal derivatives in a specific way.
양서류 초기 embryo 할구의 체축 형성 능력에 관한 연구
정해문,김윤경 한국통합생물학회 1987 동물학회지 Vol.30 No.3
In order to investigate the importance of the prospective mesodermal and endodermal blastomeres at 32-cell stage in the anis formation, blastomeres were deleted or transplanted into the ventrovegital site of another normal embryo. The results are as follows: When the dorsomesodermal or dorsoendodermal blastomeres were deleted, there was a substantial developmental lesion in the axis structure. However, when the ventromesodermal or ventroendodermal blastomeres were deleted, the formation of an axis structure was nearly normal. The dorsomesodermal or dorsoendodermal blastomeres which were transplanted into the ventral side of the normal 32-cell embryo caused the formation of a secondary body axis, and the capacity of the second axis induction in the dorsomesodermal blastomeres was a little higher than that in the dorsoendodermal blastomeres. These results imply that both the dorsomesodermal and dorsoendodermal blastomeres are involved in the formation of a set of dorsal body structures during early embryogenesis. As well, in order to investigate the axis inducing capacity in the early cleavage embryos, the dorsovegital blastomeres were transplanted into the ventrovegital site at 4-cell, 8-cell and 16-ceIL stage respectively. As a ruts·fIt, a second body axis was formed. Therefore, it seems that the early cleavage embryo as 4-cell stage dorsal blastomeres contain some informations necessary for the axis formation.
Partial Cloning of Xhox3.1 Gene in Xenopus laevis
정해문,김태균,남상욱,고제명 한국유전학회 1996 Genes & Genomics Vol.18 No.2
VNTR(variable number tandem repeat) loci in the genome are characterized-as their copy number of the same repeat unit and are extremely polymorphic having potentially hundreds of alleles at a single locus. In this study, allele distribution on the hTPO VNTR marker was analyzed by PCR(polymerase chain reaction) in Korean population(100 individuals). Twenty two alleles were identified in the hTPO VNTR locus and alleles 7(8.5%), 10(11.0%), and 15(15.0%) showed three highest peaks. The allele frequency of hTPO VNTR locus is in the 95% confidence interval. PIC(polymorphism information content) value calculated on hTPO VNTR loci was 0.92. POE(power of exclusion) value used in paternity cases was 0.80. MP(matching probability) used in forensic identification was 0.018. In conclusion, statistical data from hTPO VNTR locus showed this locus is a very useful genetic marker for the linkage study, evolutionary genetics and forensic application.