• 한국컴퓨터정보학회논문지
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• 제18권4호
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• pp.161-169
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• 2013

현재 우리나라는 대리모 출산을 둘러싼 가족법이나 모성추정의 법안이 없고, 사회적으로도 대리모 관련 문제들이 언론에서 보도는 된 적이 있지만 이러한 논의를 지속적으로 행해지는 못했다. 생명윤리 및 안전에 관한 법률의 제정과정에서 초기에 논의는 있었지만 이를 법안으로 수용하지 못하여 법적으로나 윤리적으로도 매우 곤란한 문제가 제기되고 있는 실정이다. 그동안 법적인 해석의 어려움과 윤리상의 문제에도 불구하고, 대리모 출산은 음성적으로 공공연히 행해지고 있고, 이에 대하여 최근까지 우리의 법률은 공서양속에 반한다는 이유로 그 법률행위의 무효를 선언하고 있는데 불과하다. 따라서 대리모계약의 문제는 공서양속에 반한다고 무효화하여 방치하기엔 대리모권리와 그 계약에 의해 출생한 자의 복리의 문제가 심각한 사회문제를 일으킬 수 있다고 본다. 이제는 대리모계약의 문제에 대한 법적, 의학적인 대책이 강구되어야 할 때라고 본다. 따라서 이와 관련하여 본 논문에서는 대리모계약에 따른 여러 문제를 해결하기 위하여, 먼저 대리모계약의 문제점을 고찰함과 동시에, 대리모계약에 대한 각국의 입법례를 이를 바탕으로 우리나라의 대리모에 대한 입법론을 제시하고자 한다.

• 한국수정란이식학회지
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• 제25권4호
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• pp.215-219
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• 2010

The objective of this study was to examine the reproductive characteristics of cloned miniature piglets produced from surrogate domestic pigs. Somatic cell nuclear transfer (SCNT) miniature pig embryos were transferred into domestic pigs. As controls, domestic pigs of the same breed with surrogates for SCNT embryos and miniature pigs of the same breed with the somatic cell donor were bred by artificial insemination and natural mating, respectively. Surrogate domestic pigs that farrowed cloned miniature piglets had a significantly longer gestation length (118.1 days) than conventionally bred domestic (115.4 days) and miniature (115.5 days) pigs. Furthermore, the birth weight of cloned miniature piglets produced from domestic pigs (743 g) was significantly greater than that of miniature piglets produced by natural breeding (623 g). Also, cloned miniature piglets had a significantly lower weaning rate (49.7%) than conventionally produced domestic (91.5%) and miniature (100%) piglets. No differences were observed between female and male cloned piglets in gestation length, litter size, birth weight, or weaning rate. Our results demonstrate that gestation length is extended in domestic pigs that are transferred with SCNT miniature pig embryos and that cloned miniature piglets have increased birth weight and high pre-weaning mortality.

• 한국수정란이식학회지
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• 제27권1호
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• pp.1-7
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• 2012

Somatic cell nuclear transfer (SCNT) for miniature pig has been developed for xenotransplantation and many other biomedical experiments. However, the efficiency of SCNT is still very low due to many factors. To optimize the surrogate mother condition for improvement of cloned miniature pigs efficiency, we investigated the effect of the status of surrogate mother on pregnancy, farrowed rate in SCNT pigs. After SCNT with mesenchymal stem cells as donor cells, the SCNT embryos were surgically transferred into the oviduct of surrogated pigs. To compare the effects of status of surrogate pigs on pregnancy, surrogate pigs were prepared by artificial abortion at day 20~29 (Group 1), 30~39 (Group 2), and 40~45 (Group 3) of gestation. After SCNT embryos transfer in three different status of surrogate pigs, Group 2 (56.3%) and 3 (55.6%) had significantly ($p$ <0.05) higher the pregnancy rate than group 1 (0%) at day 30 of gestation. The status of ovulation in surrogate pig also was investigated. Post-ovulation status (54.8%) had higher proportion than pre-ovulation status (38.7%) and ovulation status (6.5%). We obtained 19 cloned miniature piglets from seven surrogate gilts and five piglets are living healthy but fourteen piglets died soon after birth or stillbirth. The weights of piglets greatly differ from 254 to 1,296 g. Microsatellite analysis showed that cloned piglets were genetically different from the surrogate mother and cloned piglets were genetically equal to the donor cell. In conclusion, the present result indicates that artificially abortion method can improve the efficiency of pregnancy after SCNT in pigs. This study will provide available method for the further study and application in the field of xenotransplantation.

• 한국동물번식학회:학술대회논문집
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• 한국동물번식학회 2003년도 학술발표대회 발표논문초록집
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• pp.33-33
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• 2003

This study was conduct to compare the efficacy to produce male and female somatic cloned piglets. Maturation of porcine COCs was accomplished by incubation in NCSU-23 medium supplemented with 0.6 mM cysteine, 10% porcine follicular fluid, 1mM dibutyryl cyclic adenosine monophosphate (dbc-AMP, Sigma, USA), and 0.1 IU/ml human menopausal gonadotrophin (hMG, Teikokuzoki, Japan) for 20h and then cultured without dbcAMP and hMG for another 18 to 24 h. Female and male fetal cells were isolated from each fetus, cultured in ES-DMEM medium containing 10% FCS. Enucleated oocytes were fused with fetal fibroblasts (passage 4 to 15). Reconstructed embryos were cultured in NCSU-23 with 4 mg/ml BSA under mineral oil at 39$^{\circ}C$ in 5% $CO_2$ in air. A total of 12,328 nuclear-transferred embryos (1- to 4-cell stage) were surgically transferred into 69 surrogate gilts. Three recipients aborted during the period of conception. Three gilts delivered eleven female piglets, and five recipients gave rise to birth 22 male piglets. The average birth weigh of the cloned piglets was 1.52 kg (1.38~1.83 kg) in female piglets and 0.84 kg (0.45~1.25 kg) in male piglets. Alive cloned pigs was seven in female piglets (63.6%) and four in male piglets (18.2%). The other two recipients is ongoing. This study suggests that female-derived fetal cell as a nuclear donor has more capability on production of cloned piglets than male.

• Journal of Animal Science and Technology
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• 제66권1호
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• pp.156-166
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• 2024

Pigs are genetically, anatomically, and physiologically similar to humans. Recently, pigs are in the spotlight as a suitable source animal for xenotransplantation. However, to use pigs as source animals, pigs should be raised in designated pathogen-free facilities. There is abundant data from embryo transfer (ET) experiments using farm pigs as surrogates, but data on ET experiments using minipigs are scarce. Eighty minipigs were used for ET experiments and after transplantation, the implantation and delivery rates were investigated. It was also confirmed whether the pregnancy rate could be increased by changing the condition or surgical method of the surrogate. In the case of minipigs that gave birth, the size of the fetal sac on the 28th day of ET was also measured. The factors that can affect the pregnancy rate such as estrus synchronization program, ovulation status at the time of ET, the number of repeated ET surgeries, and the ET sites, were changed, and the differences on the pregnancy rate were observed. However there were no significant differences in pregnancy rate in minipigs. The diameter of the implanted fetal sac on the 28th day after ET in the minipigs whose delivery was confirmed was calculated to be 4.7 ± 0.5 cm. In conclusion, there were no significant differences in pregnancy rate of minipigs in the comparative experiment on various factors affecting the pregnancy rate. However, additional experiments and analyses are needed due to the large individual differences of the minipigs.

• Asian-Australasian Journal of Animal Sciences
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• 제30권4호
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• pp.585-592
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• 2017

Objective: The present study investigates pre- and post-implantation developmental competence of nuclear-transferred porcine embryos derived from male and female fetal fibroblasts. Methods: Male and female fetal fibroblasts were transferred to in vitro-matured enucleated oocytes and in vitro and in vivo developmental competence of reconstructed embryos was investigated. And, a total of 6,789 female fibroblast nuclear-transferred embryos were surgically transferred into 41 surrogate gilts and 4,746 male fibroblast nuclear-transferred embryos were surgically transferred into 25 surrogate gilts. Results: The competence to develop into blastocysts was not significantly different between the sexes. The mean cell number of female and male cloned blastocysts obtained by in vivo culture ($143.8{\pm}10.5$ to $159.2{\pm}14.8$) was higher than that of in vitro culture of somatic cell nuclear transfer (SCNT) groups ($31.4{\pm}8.3$ to $33.4{\pm}11.1$). After embryo transfer, 5 pregnant gilts from each treatment delivered 15 female and 22 male piglets. The average birth weight of the cloned piglets, gestation length, and the postnatal survival rates were not significantly different (p<0.05) between sexes. Conclusion: The present study found that the sex difference of the nuclear donor does not affect the developmental rate of porcine SCNT embryos. Furthermore, postnatal survivability of the cloned piglets was not affected by the sex of the donor cell.

• 한국임상수의학회지
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• 제27권2호
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• pp.154-158
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• 2010

소에서 유전적 군 (herd)의 향상을 위한 유용한 도구는 보조 생식술 중 배아 이식 (embryo transfer)으로 알려져 왔다. 본 연구의 목적은 캐나다 유전 능력 상위 1% 이내의 젖소에서 생산된 냉동 배아를 수입하여, 국내 수란우군을 이용한 배아이식을 적용한 후, 송아지를 생산하는 것이다. 117번의 배아 이식이 이루어졌고, 그 중 70 마리에서 임신이 확인 되었으며, 총 57 마리의 송아지가 성공적으로 태어났다. 그들의 임신기간, 체중, 성별은 각각 $278.1{\pm}3.6$ 일 (범위: 271 에서 286일), $44.0{\pm}3.0\;kg$ (범위: 37 에서 49 kg) and 57.9 vs. 42.1% (수컷: 33, 암컷: 24) 이었다. 미세위성체검사를 통하여, 태어난 송아지는 모두 수입된 배아 유래임이 증명되었다. 결론적으로, 본 연구를 통하여 캐나다에서 수입된 배아로부터 살아있는 송아지를 성공적으로 얻을 수 있었으며, 이 송아지들은 앞으로 국내 낙농산업에 있어 종모우와 종빈우가 되는 좋은 유전자원이 될 것이다.

• 한국수정란이식학회지
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• 제28권3호
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• pp.229-235
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• 2013

The objective of this study was to monitor health conditions of four genetically identical somatic cells cloned Labrador retriever puppies by estimation of body weight and analysis of hematologic and serologic characteristics. Naturally ovulated oocytes and donor cells were used for somatic cell nuclear transfer (SCNT). Donor cells and enucleated oocytes were followed by electric fusion, chemical activation and surgical embryo transfer into the oviducts of surrogate females. Two recipients became pregnant; two maintained pregnancy to term, and four live puppies were delivered by Caesarean section. The cloned Labrador retrievers were genetically identical to the nuclear donor dog. The body weight of clone-1, -2, -3, and -4 was increased from 0.66, 0.40, 0.39, and 0.37 kg at birth to 6.2, 6.6, 6.2, and 6.0 kg at 8 weeks of age, respectively. Although clone-4 had lower numbers of RBC than reference range, the most of RBC and WBC related heamatologic results of cloned puppies were not different when compared to reference range. In serological analysis, Glucose, ALP and inorganic phosphate level of four cloned puppies was significantly higher than the reference ranges. However, there was no significant difference among four cloned dogs. This study suggests that cloned puppies derived from SCNT did not have remarkable health problems, at least in the growth pattern and hematological and serological parameters.

• 의료법학
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• 제16권1호
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• pp.83-124
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• 2015

난임과 인공수정은 증가하고 있음에 비해 이에 대한 법적 규율은 미비한 상태이며, 인공수정으로 출생한 자녀의 법적 지위는 불안하다. 현재는 해석에 의해 해결하고 있지만 향후 입법이 필요한 분야로, 우리 문화와 현재 사회의 인식 정도, 의료 수준의 발달 정도, 국외 여러 나라의 선행 입법례 등을 종합적으로 검토하여야 한다. 특히 입법론에서 고려하여야 할 것은 법을 위반하여 자녀가 출생한 경우, 그의 복리이다. 법이 미래의 모든 사항을 규율할 수는 없기 때문이다. 인공수정자의 복리는 이에 관한 상세한 입법이 없는 현재에서도 중점적 고려사항이다. 자선의 자유 의지와 적극적 행위로 인공수정을 선택한 성인과 달리 인공수정자는 출생에의 선택권이 없기 때문이다. 이하 본고에서는 인공생식 기술의 유형과 현황을 설명하고, 해석과 판례에서 나타나는 인공수정자의 법적인 지위와 기타 문제 등을 살펴보겠다. 그리고 해외 입법례를 통해 향후 입법안의 방향을 제시하겠다. 인공수정의 기술적 부분에 관한 입법안은 생명윤리 및 안전에 관한 법률에 포함시키고, 인공수정자의 친자관계에 관한 법적 지위 부분은 민법전에 편입하는 방식을 취하겠다. 인류의 미래에 도움을 주는 생명과학의 발전은 장려되어야 하지만 인간의 창조나 개량을 향한 연구는 지양해야 한다. 그러므로 본 연구가 현실과 과학을 접목하여 법적인 기준을 제시할 수 있는 단조가 되기를 기대해본다.