Jun Seok Heo

Background The CRISPR-Cas systems have emerged as a robust genome editing tool useful in various fields of research. With the discovery and development of the orthologous CRISPR-Cas systems, their genome editing efficiency have improved. Objective In this review, we aim to present the recent developments and applications of the CRISPR-Cas systems. Methods First, we introduce how the advancements of CRISPR technology enabled genome editing to single base precision. Then, we discuss the CRISPR bas

Objective : There were previous reports of redundant nerve roots (RNRs) focused on their clinical significance and pathogenesis. In this study, we investigated the significant radiologic findings that correlate with RNRs occurrence. These relations would provide an advanced clue for clinical significance and pathogenesis of RNRs. Methods : Retrospective research was performed with data from 126 patients who underwent surgery for central lumbar spinal stenosis (LSS). Finally,106 patients with com

Objective : We compared the clinical and radiographic outcomes of stand-alone polyetheretherketone (PEEK) cage and Zero-Profile anchored spacer (Zero-P) for single level anterior cervical discectomy and fusion (ACDF). Methods : We retrospectively reviewed 121 patients who underwent single level ACDF within 2 years (Jan 2011–Jan 2013) in a single institute. Total 50 patients were included for the analysis who were evaluated more than 2-year follow-up. Twenty-nine patients were allocated to the ca

Objective : Delayed hinge fracture (HF) that develops after cervical open door laminoplasty can be a source of postoperative complications such as axial pain. However, risk factors related to this complication remain unclear. We performed a retrospective clinical series to determine risk factors for delayed HF following plate-only open-door cervical laminoplasty. Methods : Patients who underwent plate-only open-door laminoplasty and had available postoperative computed tomography (CT) scans (80

Objective : To assess the clinical and radiological factors as predictors for successful outcomes in lumbar disc herniation (LDH) treatment. Methods : Two groups of patients with single level LDH (L4–5) requiring treatment were retrospectively studied. The surgery group (SG) included 34 patients, and 30 patients who initially refused the surgery were included in the nerve blocks group (NG). A visual analogue scale (VAS) for leg and back pain and motor deficit were initially evaluated before proc

We report two cases of cervical spinal epidural abscess (SEA), which are related to anterior cervical surgeries. The first case reveals a late postoperative infection without any predisposing factor. The second case reveals combined complication of infection and instrument failure (artificial disc). Both two cases manifested ascending infections that are unusual courses of anterior cervical infections. The abscess extended upwards and, finally, caused life threatening bacterial meningitis. We su

기후 변화와 에너지 수급 불균형 문제 해결을 위한 신재생 에너지인 태양광 발전은 중요한 수단으로 인정받고 있다. 태양광 발전량의 신뢰성 있는 예측은 전력 수급 계획 수립과 에너지 활용 최적화에 필수적이다. 그러나 태양광 발전량은 기후 조건, 계절적 요인 및 비선형적 시계열 특성 등으로 인해 예측에 어려움이 있다. 기존 연구들은 전통적인 통계모형 혹은 AI 모형을 앙상블하여 제한된 지역의 데이터에 대해 예측을 시도하였으나, 이는 비선형적 데이터의 복잡성 및 다양한 지역적 특성을 충분히 반영하였다고 보기는 어렵다. 이에 본 연구에서는 이러한 한계를 극복하기 위해, 미래 공변량을 포함한 ARX(AutoRegressive with eXogenous varables) 모델과 MLP(Multi-Layer Perceptron) 모델을 결합한 Meta Learning 기반 Stacking 앙상블 예측 기법을 제안한다. 각 발전소별로 가장 인접한 종관기상관측소의 데이터를 외생 변수로 활용하였으며,

As we get closer to super-aged society, the prevalence of senile spinal diseases is constantly increasing and the burden on individuals and society grows high. Senile spinal disease is basically degenerative in nature. Pain and physical dysfunction occur due to various complex pathologic causes. For the diagnosis and treatment of such complex diseases, it is essential to understand common senile spinal diseases such as intervertebral disc herniation and spinal stenosis. Degenerative changes in i

The evolution of genome editing technology based on CRISPR (clustered regularly interspaced short palindromic repeats) system has led to a paradigm shift in biological research. CRISPR/Cas9-guide RNA complexes enable rapid and efficient genome editing in mammalian cells. This system induces double-stranded DNA breaks (DSBs) at target sites and most DNA breakages induce mutations as small insertions or deletions (indels) by non-homologous end joining (NHEJ) repair pathway. However, for more preci

Objective: The purpose of this study was to evaluate the safety and efficacy of cervical midline-splitting French-door laminoplasty with a polyether ether ketone (PEEK) plate. The authors retrospectively analyzed the results of patients with cervical laminoplasty miniplate (MAXPACER®) without bone grafts in multilevel cervical stenosis. Methods: Fifteen patients (13 males and 2 females, mean age 50.0 years (range 35-72)) with multilevel cervical stenosis (ossification of the posterior longitudin

The sacral spinal epidural space is an uncommon site for primary malignant lymphomas, presenting with symptoms associated with cauda equina compression. Especially, lumbo-sacral epidural lymphoma has been reported to be very rare. We present a rare case of 29-year-old male with sacral spinal epidural malignant lymphoma. The patient complained of tingling sensation in his buttocks that was radiating to his calf. The neurological examination was normal. Magnetic resonance imaging (MRI) with contra

Objective: To demonstrate the noninferiority of the novel hemostatic agent, Hemofence (BMI Korea Co. , Ltd. , thrombin cross-linked sodium hyaluronate gel matrix) compared to the established agent, Floseal Hemostatic Matrix (Baxter, thrombin-gelatin matrix) in achieving hemostasis for spinal surgeries, with secondary objectives to assess additional efficacy and safety. Methods: This clinical trial was a multicenter, randomized, subject-blinded, active-controlled, parallel-group, phase 3 study. I

Background To date, no experiments have been conducted to generate a neurofi bromatosis type 1 (NF1) mouse model using the clustered regularly interspaced short palindromic repeats (CRISPR)-CRISPR associated protein 9 (CRISPR-Cas9) embryo editing system. Objective This study was to deliver ribonucleoprotein (RnP) via electroporation in various formats and delivery methods of the CRISPR-Cas9 system for genetic modifi cation of mouse embryonic fi broblast NIH3T3 cells and embryos. The insertion– d