Genetic Diseases, Inborn ; diagnosis ; Humans ; Mouth Diseases ; diagnosis ; genetics

A case of hereditary benign telangiectasia without family history was reported. A 39-year-old woman presented with small and tiny telangiectases on the face, neck, upper trunk and forearms at birth. The numbers and sizes of the lesions increased gradually and she had no hemorrhagic diathesis and systemic diseases. No similar patients were found in her family. Upon physical examination, telangiectases were found on the face, neck, upper trunk and forearms; and a telangiectatic erythema was found on the right forearm 25 mm × 40 mm in size. Histopathology examination showed a normal epidermis and dilation of the capillaries at upper dermis. Hereditary benign telangiectasia without family history was diagnosed.
Adult ; China ; Female ; Genetic Diseases, Inborn ; diagnosis ; Humans ; Telangiectasis ; diagnosis

Next-generation sequencing, such as whole-genome sequencing, whole-exome sequencing, and targeted panel sequencing have been applied for diagnosis of many genetic diseases, and are in the process of replacing the traditional methods of genetic analysis. Clinical exome sequencing (CES), which provides not only sequence variation data but also clinical interpretation, aids in reaching a final conclusion with regards to genetic diagnosis. Sequencing of genes with clinical relevance rather than whole exome sequencing might be more suitable for the diagnosis of known hereditary disease with genetic heterogeneity. Here, we present the clinical usefulness of CES for the diagnosis of hereditary spastic paraplegia (HSP). We report a case of patient who was strongly suspected of having HSP based on her clinical manifestations. HSP is one of the diseases with high genetic heterogeneity, the 72 different loci and 59 discovered genes identified so far. Therefore, traditional approach for diagnosis of HSP with genetic analysis is very challenging and time-consuming. CES with TruSight One Sequencing Panel, which enriches about 4,800 genes with clinical relevance, revealed compound heterozygous mutations in SPG11. One workflow and one procedure can provide the results of genetic analysis, and CES with enrichment of clinically relevant genes is a cost-effective and time-saving diagnostic tool for diseases with genetic heterogeneity, including HSP.
Diagnosis ; Exome* ; Genetic Diseases, Inborn ; Genetic Heterogeneity ; Humans ; Spastic Paraplegia, Hereditary*

The polymerase chain reaction (PCR) technique has been widely used in fields of molecular biology and diagnosis. PCR biochip/microdevice is increasingly of great interest as a result of its small volume of sample and reaction mixture, short reaction period and portability. The applications of PCR biochip/microdevice are specially introduced in the clinical diagnosis. Finally, the applications and development of PCR biochip/microdevice are also predicted.
Genetic Diseases, Inborn ; diagnosis ; Humans ; Infection ; diagnosis ; Neoplasms ; diagnosis ; Polymerase Chain Reaction ; instrumentation ; methods

Early Diagnosis ; Early Intervention (Education) ; methods ; trends ; Genetic Diseases, Inborn ; diagnosis ; therapy ; Humans ; Research ; trends

Congenital hereditary stromal dystrophy of the cornea is a rare hereditary disease which is inherited in autosomal dominant fashion. This disorder is not related to abnormal endothelial cell architecture and function. It presents as bilateral, congenital opacifications of the cornea and has unique histopathologic changes of the stroma such as alternating patterns of densely packed lamellae and loose lamellae. We experienced a family with congental corneal opacifications and performed penetrating keratoplasties in 2 patients. The obtained corneal buttons were examined by light and electron microscopy. The characteristic changes of stromal lamellae were consistent with a diagnosis of congenital hereditary stromal dystrophy of the cornea.
Cornea* ; Diagnosis ; Endothelial Cells ; Genetic Diseases, Inborn ; Humans ; Keratoplasty, Penetrating ; Microscopy, Electron

Cell-free fetal DNA in maternal plasma of pregnant woman, originated from fetal and / or placental cells undergoing apoptosis, is mainly the short-sized DNA fragments of less than 313 base pairs in length for the sake of nuclear endonuclease selectively cleaving fetal DNA during the apoptosis process. The mean cell-free circulating fetal DNA in maternal plasma accounted for 3.4% and 6.2% of plasma total DNA during the early and the late gestation, respectively. Owing to its relative abundance, circulating fetal DNA in maternal plasma has now become the important DNA source for non-invasive prenatal molecular genetic diagnosis and it is widely used in fetal sex-determination, detection of fetal Rh (D) sequence in the plasma of the rhesus-negative woman, fetal aneuploidy detection, fetal STR genotyping and other clinical applications. Cell-free fetal DNA source, concentration, purity, size, distributions and postnatal clearance of fetal DNA in maternal plasma as well as the reported clinical applications are summarized and discussed in this paper. Based on the molecular characteristics of cell-free fetal DNA and the target gene, the using of appropriate molecular diagnosis strategy and experimental design as well as reducing the fragment size of PCR product and adjusting the PCR conditions to the optimum enable the improvement of non-invasive prenatal diagnosis accuracy.
Cell-Free System ; DNA ; blood ; metabolism ; Fetus ; metabolism ; Genetic Diseases, Inborn ; diagnosis ; genetics ; Humans ; Mothers

Metaphyseal Chondrodysplasia is rare, hereditary disease characterized by defective enchondral bone formation with major manifestation at the metaphysis. Jansen originally used the term metaphyseal dysostosis in 1934 to describe a patient who has a short stature with irregular metaphysis of the lower extremity and hands. Schmid reported a milder form of Metaphyseal dysostosis in 1949, which is more common and is transmitted in autosomal dominant trait. Mukusick reported another form of Metaphyseal Chondrodysplasia which is associated with ectodermal abnormalities in 1964. The other different types were reported alos, but they are extremly rare. The basic defect in the disease may be the failure of hypertrophic cells to mature and degenerate, caused by a block in or deficiency of enzymes of glycolytic cycle. The skull and spine are spared. Serum chemistry and kidney function are normal. The only treatment necessary, once adequate diagnosis has been estabilished, is careful observation and properly timed corrective orthopaedic surgery. We experienced one case of Schmid Type Metaphyseal Chondrodysplasia. Corrective osteotomy was performed and satisfactory result was obtained.
Chemistry ; Diagnosis ; Dysostoses ; Ectoderm ; Genetic Diseases, Inborn ; Hand ; Humans ; Kidney ; Lower Extremity ; Osteogenesis ; Osteotomy ; Skull ; Spine

Follow-up is a crucial step for the screening of neonatal genetic and metabolic diseases, which can directly influence the detection, diagnosis, efficacy of treatment, as well as the quality of neonatal screening. In view of the lack of follow-up, full understanding, and inconsistent requirement between various agencies and personnel in China, there is an urgent need for standardization. The Committee for Proficiency Testing of the Neonatal Genetic Metabolic Disease Screening Center of the National Health Committee of China has organized the writing of expert consensus for follow-up of neonatal genetic and metabolic disease screening after thorough discussion, so as to guide the follow-up work and improve its quality.
China ; Consensus ; Follow-Up Studies ; Genetic Diseases, Inborn ; diagnosis ; Humans ; Infant, Newborn ; Metabolic Diseases ; diagnosis ; genetics ; Neonatal Screening

More than 7000 single gene diseases have been identified and most of them lack effective treatment. As an early form of prenatal diagnosis, preimplantation genetic diagnosis (PGD) is a combination of in vitro fertilization and genetic diagnosis. PGD has been applied in clinics for more than 20 years to avoid the transmission of genetic defects through analysis of embryos at early stages of development. In this paper, a review for the recent advances in PGD for single gene diseases is provided.
Animals ; Female ; Fertilization in Vitro ; Genetic Diseases, Inborn ; diagnosis ; embryology ; genetics ; Humans ; Pregnancy ; Preimplantation Diagnosis ; methods ; trends ; Prenatal Diagnosis ; methods ; trends