查看更多>>摘要:目的 分析1例表现为视神经萎缩和全面发育障碍患儿的遗传学病因。 方法 选取2022年1月因"视物障碍、发育迟缓"于广州市妇女儿童医疗中心就诊的1例患儿为研究对象。收集患儿相关临床资料,应用全外显子组测序(WES)对患儿进行检测,对检出变异进行Sanger测序验证与生物信息学分析。 结果 患儿为9月龄女性,主要表现为有视觉障碍,运动与认知全面发育落后。基因检测示患儿携带NR2F1基因c.425G>C(p.Arg142Pro)新发变异,与Bosch-Boonstra-Schaaf综合征密切相关。参照美国医学遗传学与基因组学学会(ACMG)相关指南,判定其为致病性变异(PS2+PM1+PM2_Supporting+PM5+PP3+PP4)。 结论 NR2F1基因c.425G>C(p.Arg142Pro)变异可能是本研究患儿的遗传学病因,进一步丰富了NR2F1基因的变异与表型谱。 Objective To explore the genetic basis for a child with optic atrophy and global developmental delay. Methods A child who had presented at the Guangzhou Women and Children′s Medical Center in January 2022 was selected as the study subject. Clinical data were collected. Whole exome sequencing (WES) was carried out for the child. Candidate variant was validated by Sanger sequencing and bioinformatic analysis. Results The child, a nine-month-old female, had manifested dysopia and global developmental delay. Genetic testing revealed that she has harbored a de novo c. 425G>C (p.Arg142Pro) variant of theNR2F1 gene, which has been associated with Bosch-Boonstra-Schaaf syndrome. Based on the guidelines from the American College of Medical Genetics and Genomics (ACMG), the variant was classified as pathogenic (PS2+ PM1+ PM2_Supporting+ PM5+ PP3+ PP4). Conclusion The c. 425G>C (p.Arg142Pro) variant of theNR2F1 gene probably underlay the pathogenesis in this child. Above finding has enriched the genotypic and phenotypic spectrum of the NR2F1 gene.
查看更多>>摘要:目的 探讨产前诊断使用侧平底培养试管对绒毛和羊水细胞培养、染色体制备的应用价值。 方法 收集来自2020年1月至2021年5月在广西壮族自治区妇幼保健院遗传门诊就诊进行侵入性产前诊断孕妇的检验样品,其中绒毛样品157例和羊水样品147例。每例样品分别采用1支侧平底培养试管和1个传统细胞培养方瓶进行2种方法的细胞培养,对2种方法检验对侧平底培养试管法与传统细胞培养方瓶法从细胞接种、细胞培养、染色体制备整个实验过程和耗材进行比较。 结果 绒毛和羊水样本培养的成功率侧平底培养试管法分别为97.45%(153/157)和97.96%(144/147);传统细胞培养方瓶法分别为98.73%(155/157)和98.64%(145/147),统计学分析2种培养方法成功率无显著差异(P>0.05)。绒毛和羊水样本从接种到细胞收获的平均时间侧平底培养试管法分别为8.45 d和9.43 d;传统细胞培养方瓶法分别为9.05 d和9.54 d,绒毛样本使用侧平底培养试管法平均细胞收获天数少于传统细胞培养方瓶法(P<0.001);羊水样本使用2种方法细胞平均收获时间无显著差异(P>0.05)。整个实验过程侧平底培养试管法均在1支侧平底培养试管中进行,无需细胞转移,而传统细胞培养方瓶法需要更换3个容器和2次样本转移。平均每支侧平底培养试管和每个传统细胞培养方瓶使用培养基的总量分别为3.91 mL和6.26 mL。 结论 使用侧平底培养试管对绒毛和羊水样本进行细胞培养、制备染色体是一种安全、简便、高效、误差少和成本低的染色体制备技术,具有在产前诊断中推广应用的价值。 Objective To assess the value of using flat-sided culture tubes for preparing chromosomes through chorionic villi (CV) and amniotic fluid (AF) cell cultures during prenatal diagnosis. Methods From February to March 2020, 157 CV samples and 147 AF samples subjected to prenatal diagnosis at the Maternal and Child Health Care Hospital of Guangxi Zhuang Antonomous Region were selected as the study subjects. For each sample, one flat-sided tube and one flask culture were set up by following the standard protocols. The methods were evaluated by comparing the cell growth, experimental process, quality of chromosome preparation and costs. Results The success rates for the culturing of CV and AF samples by the flat-sided culture tube method were 97.45% (153/157) and 97.96% (144/147), respectively. By contrast, the success rates for the conventional flask method were 98.72% (155/157) for CV and 98.64% (145/147) for AF samples. No significant difference was found between the two methods (P > 0.05). The average harvest time required by the flat-sided culture tube method was 8.45 days for CV and 9.43 days for AF cultures, whilst the average harvest time for conventional flask method was 9.05 days and 9.54 days, respectively. The flat-sided culture tube method for CV had required significantly shorter average harvest time than the conventional method ( P < 0.001). No statistical significant difference was found in the average harvest time for AF by the two methods ( P > 0.05). The conventional culturing method had required three containers with two sample transfers. By contrast, the flat-sided culture tube method was carried out in one tube without any sample transfer. The average total amount of medium used was 3.91 mL for each flat-sided culture tube and 6.26 mL for each conventional flask. Conclusion The flat-sided culture tube method can provide a simple, cost-effective and error-reducing procedure for the CV and AF samples culture during prenatal diagnosis.