• 한국동물번식학회:학술대회논문집
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• 한국동물번식학회 2004년도 춘계학술발표대회
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• pp.231-231
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• 2004

Successful embryonic development is dependant on temporal and stage-specific expression of appropriate genes. However, information on specific gene expression during early cleavage before zygotic gene activation (ZGA) is lacking. In the present study, we compared gene expression between porcine parthenotes 2-cell and blastocyst embryos to identify the genes that are specifically or prominently expressed by employing annealing control primers (ACP)-based Gene Fishing RCR. (omitted)

• Journal of Chest Surgery
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• 제27권9호
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• pp.812-814
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• 1994

The esophageal cyst result from a wrong cleavage of the primitive gut in the 4 weeks embryo. In embryo and after seperation of the tracheal diverticulum, the esophagus is lined with ciliated cells which are able cover a "cystic duplication". It is often difficult to distinguish between the bronchogenic and the esophageal cyst. Pathological findings showed the presence of a ciliated epithelium without cartilage which was diagnosed as an esophageal cyst. The patient was 21 year old man for evaluation of the cyst in the posterior mediastinum. The cyst was located the intramural esophagus. Microscopically, the cyst was lined with ciliated columnar epithelium and there was no evidence of cartilage. The cyst was confirmed as the intramural esophageal cyst.geal cyst.

• 한국수정란이식학회지
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• 제7권1호
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• pp.41-47
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• 1992

1. In vitro system, LR and FSR accelerated and facilitated meiotic progression, and LH selectively improved cytoplasmic maturation which is required to promote the formation of a male pronucleus. 2. Caffeine (2mM) in the fetilization medium was required not only for inducing zona penetrating ability of boar also for developing to the male pronucleus of the penetrat- ing spermatozoa in vitro. 3. The germinal vesicle (GV)stage was observed for the first 17.6 hr;germinal vesicle break-down (GVBD)stage between 17.6~26.4 hr ;metaphase I (M-I)from 26.4 - 30. 9hr;anaphase I(A-I)ranged from 30. 9~33.4hr;telophase I(T-I) at 33.4~34.4hr; and metaphase II(M-II) at 34.4-48hr. 4. The addition of 10%(v /v) pig follicular fluid (pFF) to maturation media significantly increased the rate of nuclear maturation of pig oocytes (p<0.01), whereas the rate of nuclear maturation of pig oocytes among three different media did not differ. 5. The presence of a primary culture of POEC promotes in vitro development of early cleavage stage pig embryos.

• 한국동물학회지
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• 제25권3호
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• pp.107-114
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• 1982

수정 직후 일어나는 배, 복측 결정의 기작을 알아 보기 위하여 자외선의 조사와 난의 회전방법을 한국산 무미양서류에 적용하였다. 제 1 분열전의 수정난을 일정기간 $90^\\cdot$회전시키면 자외선에 의한 전형적인 발생결함을 억제시킬수 있었다. 한편, 제 1 분열 전 단기간 회전시킨 난으로부터 발생한 embryo의 원구배순부의 위치도 회전시 중력의 반대 방향에 위치하였던 새로운 장소에 형성되었다. 위의 결과는 다른 무미, 유미양서류를 통하여 얻은 지식과 비교 검토하여 초기발생 기작을 이해하는데 접근하고자 하였다.

• 대한생식의학회:학술대회논문집
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• 대한불임학회 2006년도 The 5th Biannual Meeting of Pacific Rim Society for Fertility and Sterility
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• pp.155.2-155.2
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• 2006

• 한국수정란이식학회지
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• 제22권2호
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• pp.121-126
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• 2007

본 연구에서 돼지 난포란에서 채취된 난모 세포들을 체외성숙 후 형태적으로 선별하거나 극체 방출란을 선별하여 활성화 처리 후 48시간째에 분할란을 선별할 때 배발달율이 어느정도 향상되는지를 검토하였다. 난모 세포를 48시간 성숙 배양 후 형태적 선별과 극체의 방출 유무를 검사하고, 선별된 난모 세포들을 $16{\sim}18$시간 추가 배양한 후 7% ethanol로 활성화시키고 $5{\mu}g/ml$ cytochalasin B에 5시간 노출 후 PZM-5 배 양액으로 7일간 배양하였으며, 배양 중 4일째 5% FBS를 추가하였다. 48시간 성숙 후 형태적으로 선별하였을 때, 21.9%가 제거되고 78.1%가 선별되었으며, 극체 방출란을 선별하였을 때, 32.1%가 제거되고, 67.9%가 선별되었다. 형태적으로 선별한 난자를 활성화 처리하여 48시간째에 분할율을 검사하였을 때, 15.8%가 분할하지 않았으며, 52.6%가 정상 분할하였고, 31.6%가 과분할하였으며, 극체 방출란을 선별하여 활성화 처리 후 분할율을 검사하였을 때 7.1%가 분할하지 않았으며, 73.1%가 정상 분할하였고, 19.8%가 과분할하였다. 체외 성숙된 난모세포를 형태적으로 선별하고 활성화 처리 후 분할란을 선별하지 않았을 때, 16.7%가 배반포기로 발달하였고, 형태적으로 선별하고 분할란을 추가로 선별해 배양했을 때 31.7%가 배반포기로 발달하였으며, 극체 방출란만을 선별하여 활성화 처리 후 분할란을 선별하지 않았을 때 39.0%가 배반포기로 발달하였고, 극체 선별과 분할란 선별을 하였을 때 배반포기 발달율이 49.0%에 이르렀다. 48시간째 미분할 난자와 정상 분할 난자, 과분할 난자를 배양하였을 때 48시간째 미분할 난자는 배반포기로 발달하지 못했으며, 정상 분할 난자는 42.5%, 과분할 난자는 4.5%가 배반포기로 발달하였다. 분할하는 시기를 활성화처리 후 12시간 간격으로 조사하였을 때 $0{\sim}12$시간 사이에 4.1%가 분할하였고, $12{\sim}24$시간 사이에 68.6%, $24{\sim}36$ 시간 사이에 19.1%, $36{\sim}48$시간 사이에 2.3%, 48시간까지 미분할 난자가 5.9%였으며, $0{\sim}12$시간 사이에 분할한 난자나 $36{\sim}48$시간 사이에 분할한 난자에서 배반포기로 발달한 난자는 없었으며, $12{\sim}24$시간 사이에 분할한 난자의 39.1%, $24{\sim}36$시간 사이에 분할한 난자의 9.5%가 배반포기로 발달하였다. 이상의 결과로 극체 방출란만을 선별하여 $12{\sim}36$시간 사이에 분할하는 난자들만을 선별하여 배양한다면 배발생능을 가진 난자들의 비율을 높일 수 있을 것으로 사료된다.

• 대한생식의학회:학술대회논문집
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• 대한불임학회 2004년도 제47차 추계학술대회
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• pp.43-44
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• 2004

• 한국수정란이식학회지
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• 제30권4호
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• pp.271-276
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• 2015

The aim of the study was to investigate the ability of sperm derived from the epididymis in regard to sperm motility, sperm penetration to oocyte and subsequent development of the embryo. Frozen-thawed sperm from epididymis showed similar percentage of motile sperm (VSL ${\geq}25{\mu}m/sec$) as compared to that of commercial sperm (control). Sperm penetration of frozen-thawed epididymal and commercial sperm was not significantly different. Moreover, cleavage and blastocyst rates were similar in both epididymal and control. Sperm derived from the epididymis also showed fertilizability and subsequent embryonic development.

• 한국수정란이식학회지
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• 제23권4호
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• pp.275-281
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• 2008

The ability to preselect the sex of piglets is advantageous in the pig industry. The objective of this study was to examine the feasibility of using intracytoplasmic sperm injection (ICSI) with sorted spermatozoa to produce piglets with a preselected sex. Pig embryos were produced by ICSI of frozen X- and Y-sperm that had been separated by flow cytometry. The developmental competence of the embryos was investigated in vitro and in vivo. The populations of X- and Y-spermatozoa were 52.7% and 47.3%, respectively in our samples. The in vitro development of ICSI embryos was enhanced by longer of in vitro maturation of oocytes ($44{\sim}48\;h$ vs. $40{\sim}43\;h$). Their cleavage ($65{\sim}70%$) and blastocyst formation ($9{\sim}12%$) rates were not significantly different between male and female ICSI embryos, or between sorted and unsorted sperm-derived embryos. One pregnancy was established in a recipient that was transferred with 110 female ICSI embryos, but the pregnancy was terminated on Day 89 of gestation. Our results suggest that the separation X- and Y-spermatozoa by flow cytometric sorting can be a useful tool in combination with ICSI for the production of pig embryos and piglets of preselected sex.

• 한국수정란이식학회지
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• 제14권2호
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• pp.93-97
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• 1999

The development potential of bovine somatic cells was evaluated using nuclear transfer. A single donor cell derived from fetus of HanWoo(Korean Native Cattle) was selected and deposited into perivitelline space of each enucleated oocyte before electrical fusion and activation. Nuclei of donor cells starved for 7 days (37%) tended to support the development of reconstitute embryo the blastocyst stage better than those of donor cells starved 3, 14 and 30 days. The cleavage rate was significantly lower(P<0.05) in reconstitute embryos derived from large size donor cells(51.2%), than those from small medium size donor cells(76.6 and 73.5, respectively). The developmental rate to blastocyst of reconstructed embryos from medium size donor cells was higher than those from small and medium size donor cells. This study demonstrates that an appropriate culture period for induction into quiescent stage and the size of donor cells effect on the efficiency of nuclear transfer using cultured bovine cells.