جستجوی مقالات مرتبط با کلیدواژه "skin disorder" در نشریات گروه "پزشکی"

Junctional epidermolysis bullosa (JEB) is an autosomal recessive skin disorder with defective adhesion of dermal- epidermal within the lamina lucida region of the basement membrane zone. The main characterization of JEB is blistering and fragile skin and mucous membrane. Laminins are noncollagenous part of basement membrane and classified as a family of extracellular matrix glycoprotein. Laminins contain three chains: Laminin α, Laminin β and Laminin γ. LAMC2 (laminin subunit gamma 2) gene encodes γ subunit of laminin and its mutation contributes to JEB. Here, we report a disease-causing nonsense mutation and a large deletion mutation in LAMC2 gene in two families affected by JEB.

Whole exome sequencing (WES) was carried out on the mother of patient in family I and the patient himself in family II to detect the underlying mutations. Then, sanger sequencing was performed to confirm the identified mutations.

Next generation sequencing (NGS) data analysis of the first family showed a novel, nonsense mutation in LAMC2 gene (LAMC2: NM_005562: exon14:c.C2143T: p.R715X). The heterozygous state of the mutation was confirmed by sanger sequencing in the parents and unaffected brother. In Family II, NGS data had no coverage in the large area of LAMC2 gene. Thus, to confirm the possible deletion sanger sequencing was done and blasting of sequence showed the deleted region of 9.4 kb (exon10-17) in LAMC2 gene.

In summary, current study reported a novel disease-causing premature termination codon (PTC) mutation in LAMC2 gene and a large deletion mutation in patients affected by JEB.

Ichthyoses as epidermal genodermatoses are a large group of keratinization disorders that affect the entire integument, which is typically characterized by visible scaling and inflammation on the skin. Nowadays, in addition to clinical criteria, new molecular diagnostic methods, such as next-generation sequencing, can help to differentiate the subgroups of ichthyoses more precisely. These disorders are mostly classified based on clinical and histologic features and molecular markers. Inherited ichthyoses were divided into two groups: non-syndromic ichthyosis and syndromic ichthyosis. Non-syndromic ichthyosis is a group of various skin diseases with genetic and clinical heterogeneity. In this group, ichthyosis vulgaris and recessive X-linked ichthyosis are common and are often of delayed onset. Correct diagnosis of the molecular defects resulted from ichthyosis is useful for the prediction of the prognosis, genetic counseling (accurate risk assessment), prenatal diagnosis, and a better understanding of skin biology. However, the most essential and promising advantage of a precise molecular diagnosis is using gene therapy for its treatment, which may be considered as a subcategory of personalized medicine. This review is focused on the different aspects of non-syndromic ichthyoses pathophysiology.