• 대한의생명과학회지
• /
• 제11권4호
• /
• pp.421-427
• /
• 2005

To evaluate the diagnostic significance of p16 overexpression in human hepatocellular carcinoma (HCC), we analyzed p16 status and growth inhibitory patterns by p16 overexpression in HCC cell lines having different pRE status. SKHep1 and SNU449 cells show homozygous deletion of p16. The p16 gene in SNU398 cell is inactivated at posttranscription level. Adenovira1-p16 (Ad-p16) infection inhibits the cell growth in Hep3B, SNU398, and SNU449. Failure of growth inhibition in SKHepl results from the low transduction efficiency of adenovirus. The p16-mediated growth inhibition shows G 1 phase arrest in pRE-positive SNU449 but not in pRE-negative Hep3B. These results suggest that therapeutic efficacy of p16 gene might be considered on the transduction efficiency and the toxicity of adenoviral vector. Beside, growth inhibitory effect of p16 could be exerted through either pRE-dependent or -independent pathway.

• Journal of Microbiology and Biotechnology
• /
• 제11권4호
• /
• pp.724-726
• /
• 2001

The growth of baceriophage T4 is inhibited by the presence of the tin gene product o bacteriophage P2. The interaction between purified Tin and gp32 proteins was observed using coimmunoprecipitation experiments. The in vivo interaction was confirmed by yeast two-hybrid experiments. A deletion analysis showed that the Asp 163 region of gp32 to DNA substrates was not affected by the presence of Tin, Thus, it would appear that the inhibition of 4 growth by Tin was due to a protein-protein interaction rather than affecting the DNA-binding ability of gp32.

• 한국동물학회:학술대회논문집
• /
• 한국동물학회 1998년도 한국생물과학협회 학술발표대회
• /
• pp.113-113
• /
• 1998

In Saccharomyces cerevisiae UV irradiation and a variety of chemical DNA -damaging agents induce the transcription of specific genes, including several involved in DNA repair. One of the best characterized of DNA -damage inducible genes is PHRI, which encodes the apoenzyme for DNA photolyase. Basal-level and damage-induced expression of PHRI require an upstream activation sequence, UASPHRI. Here we report the identification of the UlvIE6 gene of S. cerevisiae as a regulator of UASPHRl activity. Surprisingly, the effect of deletion of UME6 is growth phase dependent. In wild-type cells PHRI is induced in late exponential phase, concomitant with the initiation of glycogen accumulation that precedes the diauxic shift. Deletion of UNIE6 abolishes this induction, decreases the steady-state concentration of photolyase molecules and PHRI mRNA, and increases the UV sensitivity of a rad2 mutant. The results suggest that UM E6 contributes to the regulated expression of a subset of damage-responsive genes in yeast. Furthermore, the upstream repression sequence, URSPHRI, is required for repression and damage-induced expression of PHRl. Here we show identification of YER169W and YDR096W as putative regulators acting through $URS_{PHRI}$. These open reading frames were designated as RPHI (YERl69W) and RPH2 (YDR096W) indicating regulator of PHRI. Simultaneous disruption of both genes showed a synergistic effect, producing a four-fold increase in basal level expression and a similar decrease m the induction ratio following treatment of methyl methanesulfonate(MMS). Mutation of the sequence ($AG_4$) bound by Rphlp rendered the promoter of PHRI insensitive to changes in RPHI or RPH2 status. The data suggest that RPHI and RPH2 act as damage-responsive negative regulators of PHRI. Surprisingly, the sequence bound by Rphlp in vitro is found to be $AG_4$ which is identical to the consensus binding site for the regulators Msn2p and Msn4p involved in stress-induced expression. Deletion of MSN2 and MSN4 has little effect on the induction$.$ ratio following DNA damage. However, all deletions led to a significant decrease in basal-level and induced expression of PHRI. These results imply that MSN2 and MSN4 are positive regulators of P HRI but are not required for DNA damage repression. [Supported by grant from NIH]om NIH]

• Journal of Genetic Medicine
• /
• 제18권1호
• /
• pp.31-37
• /
• 2021

Purpose: To summarize the results of chromosomal microarray analysis (CMA) for copy number variants (CNVs) detection and clinical utility in a single tertiary hospital. Materials and Methods: We performed CMA in 46 patients over the course of two years. Detected CNVs were classified into five categories according to the American College of Medical Genetics and Genomics guidelines and correlated with clinical manifestations. Results: A total of 31 CNVs were detected in 19 patients, with a median CNV number per patient of two CNVs. Among these, 16 CNVs were classified as pathogenic (n=3) or likely pathogenic (LP) (n=11) or variant of uncertain significance (n=4). The 16p11.2 deletion and 16p13.11 deletion classified as LP were most often detected in 6.5% (3/46), retrospectively. CMA diagnostic yield was 24.3% (9/37 patients) for symptomatic patients. The CNVs results of the commercial newborn screening test using next generation sequencing platforms showed high concordance with CMA results. Conclusion: CMA seems useful as a first-tier test for developmental delay with or without congenital anomalies. However, the classification and interpretation of CMA still remained a challenge. Further research is needed for evidence-based interpretation.

• Journal of Preventive Medicine and Public Health
• /
• 제31권2호
• /
• pp.275-284
• /
• 1998

1996년 3월부터 1996년 12월까지 충북대학교병원 비뇨기과에 입원하여 치료를 받은 방광암 환자 67명과 암 아닌 다른 질환을 가진 대조군 67명을 대상으로 흡연, 음주, 직업력 등을 포함한 생활 습관과 NAT2와 GSTM1, 그리고 GSTT1 유전자 다형성 양상을 조사하여 다음과 같은 결론을 얻었다. 1. NAT2 다형성 분포는, 환자군이 slow, intermediate, rapid acetylator가 각각 3.0%, 38.8%, 58.2%, 그리고 대조군이 7.6%, 40.9%, 51.5%였으며, NAT2의 활성과 방광암 위험도 사이의 관련성은 유의하지 않았다($\chi^2_{trend}=1.18$, P-value>0.05). 2. GSTM1 결손은 환자군의 68.7%, 대조군의 49.3%에서 확인되었으며, OR(95% 신뢰구간)이 2.23(1.12-4.56)으로, 방광암 발생의 위험인자로 나타났다. 3. GSTT1은 환자군의 26.9%,그리고 대조군의 43.3%에서 결손이 있는 것으로 나타나서, GSTT1 결손은 방광암에 대하여 보호효과가 있는 것으로 관찰되었다(OR: 0.48, 95% 신뢰구간: 0.23-0.99). 4. 흡연 여부는 방광암의 발생에 유의한 영향을 미치지 않는 것으로 나타났는데(OR=1.85, 95% CI: 0.85-4.03), 이는 환자군과 대조군의 흡연률이 모두 높기 때문으로 판단된다. 5. 그 외, 음주력, 직업력, 수혈 여부, 그리고 피임시술의 과거력 등의 요인들은 방광암 발생과 유의한 관련성이 없는 것으로 나타났다.

• Bulletin of the Korean Chemical Society
• /
• 제20권9호
• /
• pp.1078-1084
• /
• 1999

A synthetic cecropin A(1-13)-melittin(1-13) [CA-ME] hybrid peptide was known to be an antimicrobial peptide having strong antibacterial, antifungal and antitumor activity with minimal cytotoxic effect against human erythrocyte. Analogues were synthesized to investigate the influences of the flexible hinge region of CA-ME on the antibiotic activity. Antibiotic activity of the peptides was measured by the growth inhibition against bac-terial, fungal and tumor cells and vesicle-aggregating or disrupting activity. The deletion of Gln-Gly-Ile (P1) or Gly-Gln-Gly-Ile-Gly (P3) from CA-ME brought about a significant decrease on the antibiotic activities. In contrast, Gly-Ile-Gly deletion (P2) from CA-ME or Pro insertion (P5) instead of Gly-Gln-Gly-Ile-Gly of CA-ME retained antibiotic activity. This result indicated that the flexible hinge or β-bend structure provided by Gly-Gln-Gly-Ile-Gly, Gln-Gly, or Pro in the central region of the peptides is requisite for its effective antibiotic activity and may facilitate easily the hydrophobic C-terminal region of the peptide to penetrate the lipid bilayers of the target cell membrane. In contrast, P4 and P6 with Gly-Gln-Gly-Pro-Gly or Gly-Gln-Pro in the central region of the peptide caused a drastic reduction on the antibiotic activities. This result suggested that the con-secutive β-bend structure provided by Gly-Gln-Gly-Pro-Gly or Gly-Gln-Pro in the central hinge region of the peptide seems to interrupt the ion channel/pore formation on the target cell membranes.

• Asian Pacific Journal of Cancer Prevention
• /
• 제14권7호
• /
• pp.4057-4059
• /
• 2013

Background: Fluorescence in situ hybridization (FISH) testing may be useful to screen for bladder carcinoma or dysplasia by detecting aneuploidy chromosomes 3, 7, 17 and deletion of the chromosome 9p21 locus in urine specimens. This study aimed to assess the sensitivity, specificity, positive and negative predictive value of FISH in a multi-ethnic population in Asia. Materials and Methods: Patients with haematuria and/or past history of urothelial cancer on follow-up had their voided urine tested with FISH. Patients then underwent cystoscopy/ureteroscopy and any lesions seen were biopsied. The histopathological reports of the bladder or ureteroscopic mucosal biopsies were then compared with the FISH test results. Results: Two hundred sixty patients were recruited. The sensitivity and specificity of the FISH test was 89.2% and 83.4% respectively. The positive (PPV) and negative predictive values (NPV) were 47.1% and 97.9%. By excluding patients who had positive deletion of chromosome 9, the overall results of the screening test improved: sensitivity 84.6%; specificity 96.4%; PPV 75.9% and NPV 97.9%. Conclusions: UroVysion FISH has a high specificity of detecting urothelial cancer or dysplasia when deletion of chromosome 9 is excluded. Negative UroVysion FISH-tests may allow us to conserve health resources and minimize trauma by deferring cystoscopic or ureteroscopic examination.

• Childhood Kidney Diseases
• /
• 제16권2호
• /
• pp.73-79
• /
• 2012

목적: 일부 사구체 질환 그리고 말기 신부전 환자를 대상으로 한 연구들에서 특정 부위의 돌연변이와 deletion 그리고 미토콘드리아 DNA copy 수 등이 예후적인 경과와 관련이 있다는 주장이 제기되었다. 연구자들은 소아 IgA 신병증 환자를 대상으로 혈소판을 이용한 미토콘드리아 DNA 전체 염기서열 분석을 실시하였다. 방법: 인제의대 부산백병원 소아청소년과에서 신생검을 실시하여 IgA 신병증으로 확진된 7명의 환자를 대상으로 하였다. 대상 환아들은 동반된 전신질환이 없고 가족력상 신장질환이 없는 경우로 국한 하였다. 신생검 당시 혈청 크레아티닌 치와 사구체 여과율은 모두에서 정상 범위였으며, 각각의 연령 대에 정상 범위의 혈압을 보였다. 환자의 성별은 남자 4명 여자 3명 이었다. 환자들은 단백뇨의 정도에 따라 두 군으로 분류하였다. 결과: 신생검 당시 환자들의 평균 나이는 $11.5{\pm}2.2$세 였으며 최종 추적검사 당시의 나이는 평균 $17.9{\pm}3.2$세 였다. 환자들의 평균 추적관찰 기간은 평균 $7.8{\pm}3.1$년 이었다. 환자들은 입원당시 단백뇨의 정도에 따라 2군으로 분류하였다. 1군은 입원당시 단백뇨가 동반되지 않았던 환자들이며 2군은 신증후군의 임상 양상을 보인 환자들이었다. 최종 추적 관찰 당시 양군의 혈청 크레아티닌 치, BUN은 모두 정상 범위였다. 혈청 알부민 치는 2군에서 $3.7{\pm}0.6g/dL$로 1군의 $4.7{\pm}0.2g/dL$에 비해 유의하게 낮았으며(P=0.0241), 혈청 콜레스테롤치는 2군에서 $222.7{\pm}35.7mg/dL$로 1군의 $148.3{\pm}29.1mg$ 보다 유의하게 높았다(P=0.0283). 24시간 채집뇨상의 총단백량도 2군에서 $1,466.0{\pm}742.5\;gm$으로 1군의 $122.5{\pm}48.1\;gm$에 비해 유의하게 높았다(P=0.0135). 단회 소변을 이용한 단백/크레아티닌 비는 2군에서 $1.8{\pm}1.6$으로 1군의 $0.2{\pm}0.2$에 비해 높았으나(P=0.0961), 통계적인 유의성은 없었다. 2명의 환자에서 8,272-8,281(CCCCCTCTA) 부위 염기서열 누락을 관찰되었다. 단백뇨 정도에 따라 분류한 두군 모두에서 각각 한명씩 염기 서열의 누락이 있었다. 누락된 부위는 미토콘드리아 유래 발현되는 단백질 서열 등에 관련 없는 비부호화부위(non coding region) 이었다. 8,272-8,281 부위를 제외한 미토콘드리아 DNA 염기서열은 모두 정상이었다. 결론: 소아 IgA 신병증에서도 mtDNA common deletion이 증명됨으로해서 향후 소아 IgA 신병증에서 미토콘드리아의 기능 이상이 진행성 임상적 경과에 어떠한 영향을 미칠 수 있는 지에 대한 추가 연구가 필요하다고 생각한다.

• Journal of Microbiology and Biotechnology
• /
• 제23권10호
• /
• pp.1454-1459
• /
• 2013

The changes in prodiginines productions caused by pH shock culture of Streptomyces coelicolor strains were estimated. In Streptomyces coelicolor M511, undecylprodiginine and streptorubin B productions increased 1.8-fold (37.22 mg/g) and 2.5-fold (18.61 mg/g), respectively, by pH shock (from 7.2 to 4.0). In contrast, this resulted in the significantly decreased prodigignines production in the redP deletion mutant SJM1; 3.7-fold for undecylprodiginine, 4.4-fold for streptorubin B, 5.2-fold for methylundecylprodiginine, and 6.4-fold for methyldodecylundecylprodiginine, respectively. RT-PCR analyses showed that, during pH shock, expression of redD, the transcription activator gene, was increased while the expression of fabH, the decarboxylative condensation enzyme gene in fatty acid biosynthesis, was decreased in both strains. The enhanced redD expression was in good accordance with the increased total prodiginines production of M511. However, for SJM1 mutant, the decrease of fabH expression occurred more strikingly, such that it became almost completely turned off during acidic pH shock culture. Therefore, a down-regulation of fabH was considered to be the cause of decreased amount of total prodiginines produced, although redD expression was high in SJM1 mutant.

• 미생물학회지
• /
• 제28권1호
• /
• pp.35-40
• /
• 1990

Thiostrepton 내성 유전자(tsr)를 포함하는 multi-copy 재조합 플라스미드 pJY7J2의 제한효소 절단지도를 작성하였다. pJY, 712는 Streptomyces에서 넓은 host range를 나타내었으며 cloning 목적에 사용할 수 있는 단일 BgtIl 제한효소 인식부위를 갖고 있었다. 플라스미드 pJY 712는 lethal zygosis(Ltz+) 현상을 보였다. pJY 712의 혁질전환빈도는 S. lividans에서 $5.0\times 10^{4}$ TFU였다. pJY 712의 Bell 제한효소 인식부위에 tyrosmase 유전자(mel)를 삽입하여 플라스미드 PJY713을 제조하였다. met 유전자를 포함한 재조합 플라스미드 pJY 714는 pJY 713의 일부분(1.9kb BgllI-BelI 단편)을 제거하여 제고하였다.