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Hypohidrotic ectodermal dysplasia (HED) is a genetic disorder that can caused by mutations in the EDAR gene, which encodes the Ectodysplasin A receptor, leading to defective ectodermal structure development. This study investigates the molecular impact of a novel homozygous c.730 + 1G > T splice site variant in the EDAR gene, identified in a consanguineous Iranian family with HED. The 10-year-old proband presented with a classic, severe HED phenotype, including anhidrosis (impaired sweating) leading to recurrent hyperthermia, sparse hair, dry skin, and severe oligodontia with only three teeth present. Co-occurring thyroid dysfunction was also noted. To elucidate the variant’s predicted structural and functional consequences (likely exon 8 skipping), Molecular Dynamics (MD) simulations were performed over 50 ns, focusing on the EDAR protein’s conformational dynamics. The simulations revealed that the predicted variant-induced structural alteration leads to a more compact and rigid EDAR structure, significantly reducing its conformational flexibility. This structural change likely disrupts critical receptor interactions and downstream signaling, which are key factors in HED pathogenesis. These findings highlight the power of combining detailed clinical phenotyping with MD simulations in uncovering the precise molecular mechanisms underlying EDAR dysfunction in HED, expanding the mutational spectrum of the gene and supporting precise genetic diagnosis for improved clinical management.

Finding cytokine storm initiator factors associated with uncontrolled inflammatory immune response is necessary in COVID-19 patients. The aim was the identification of Fas/Fas Ligand (FasL) role in lung involvement and mortality of COVID-19 patients. In this case-control study, mild (outpatient), moderate (hospitalized), and severe (ICU) COVID-19 patients and healthy subjects were investigated. RNA isolated from PBMCs for cDNA synthesis and expression of mFas/mFasL mRNA was evaluated by RT-PCR. Serum sFas/sFasL protein by ELISA and severity of lung involvement by CT-scan were evaluated. Also, we docked Fas and FasL via Bioinformatics software ( in silico ) to predict the best-fit Fas/FasL complex and performed molecular dynamics simulation (MDS) in hyponatremia and fever (COVID-19 patients), and healthy conditions. mFasL expression was increased in moderate and severe COVID-19 patients compared to the control group. Moreover, mFas expression showed an inverse correlation with myalgia symptom in COVID-19 patients. Elevation of sFasL protein in serum was associated with reduced lung injury and mortality. Bioinformatics analysis confirmed that blood profile alterations of COVID-19 patients, such as fever and hyponatremia could affect Fas/FasL complex interactions. Our translational findings showed that decreased sFasL is associated with lung involvement; severity and mortality in COVID-19 patients. We think that sFasL is a mediator of neutrophilia and lymphopenia in COVID-19. However, additional investigation is suggested. This is the first report describing that the serum sFasL protein is a severity and mortality prognostic marker for the clinical management of COVID-19 patients.

Background Mucolipidosis type IV (MLIV) is a rare autosomal recessive lysosomal storage disorder due to biallelic pathogenic variants in the MCOLN1 gene. Its main impact is on the central nervous system, leading to severe psychomotor delays, progressive visual impairment, and characteristic brain abnormalities. Methods A 12-year-old male from a consanguineous Iranian family underwent clinical and imaging evaluations for suspected MLIV. Exome sequencing identified the causative variant, confirmed by Sanger co-segregation analysis, in silico tools assessed pathogenicity, protein stability, and structural impact, followed by 3D modeling (I-TASSER) and protein interaction analysis (STRING). Molecular dynamics simulations were performed with GROMACS 2020.4 employing the GROMOS96 43a1 force field to compare wild-type and mutant structures, evaluating key parameters, including root mean square deviation (RMSD), radius of gyration (Rg), hydrogen bond profiles, and solvent-accessible surface area (SASA), were analyzed, and results which were visualized using GraphPad Prism. Results Exome sequencing revealed a previously unreported homozygous nonsense variant in MCOLN1 (NM_020533.3: c.1384G > T; p.Glu462). This variant introduces a premature termination codon predicted to yield a truncated protein if translated; however, it is likely subject to nonsense-mediated mRNA decay, leading to transcript degradation and consequent loss of functional protein. Sanger sequencing confirmed the variant and its co-segregation within the family, with both parents heterozygous carriers and the patient homozygous. Bioinformatic analysis classified the variant as likely pathogenic, with high deleteriousness scores. Structural modeling indicated disruption of a helical domain. STRING analysis demonstrated strong functional associations between MCOLN1 and its paralogs MCOLN2 and MCOLN3, supporting its biological relevance. This variant expands the known spectrum of genetic causes of MLIV. Conclusion We report the first Iranian case of MLIV due to a novel homozygous nonsense variant in MCOLN1 (c.1384G > T; p.Glu462*). These findings expand the spectrum of MLIV, underscore phenotypic variability and the value of population-specific genetic data in rare disease diagnostics, and support the inclusion of this variant in targeted diagnostic panels for Iranian patients.

LAMA2 encodes the alpha-2 subunit of a protein called Laminin. It consists of three subunits Y; alpha, beta and gamma. Alpha2 subunit from LAMA2 gene along with beta-2 and gamma-2 forms laminin-2 protein. This protein is necessary for assembly of basement membrane in skeletal muscle cells, Schwann cells, astrocytes and pericytes. More than 100 LAMA2 variant identified so far which cause recessive form of muscular dystrophy (MD) either a severe form, congenital (CMD) or mild form, limb-girdle (LGMD). Patient with LAMA2 MD suffered from muscle weakness, elevated creatine kinase, facial dysmorphism, peripheral motor neuropathy, epilepsy/seizure, developmental delay, and white matter changes in brain MRI. In this study, we conducted whole exome sequencing (WES) to investigate molecular etiology of patients with CMD in one family with non-consanguineous marriage from Iran. WES has identified a novel compound heterozygous variant, [c.2049_2050del (p.Arg683Serfs*21)]; [c.2857–2 A > G (p.?)], in the proband. The identified variant was confirmed by Sanger sequencing and its segregation within the family was verified. Subsequently, in-silico analysis was performed to map the protein–protein interaction network between LAMA2 and proteins implicated in CMD pathogenesis. Our findings may be considered valuable molecular and clinical insights for improving our understanding of CMD, particularly regarding LAMA2 variants. Furthermore, this finding gives new insights to laboratorians, genetic counselors and clinicians for determining at-risk couples in the prenatal diagnosis (PND) program.

Glioblastoma is a very invasive and prevalent brain tumor that affects 15 in 100,000 persons over the age of 70 years. Studies have shown that the expression of the WD repeat domain 81 (WDR81) gene, which is effective in vesicular transport and inhibition of autophagy, is increased in glioblastoma. The decreased autophagy was found to be related to the increased production of exosomes, which is a major factor in the pathogenesis of glioblastoma. The PI-3kinase complex is a pre-autophagic complex that is highly active in the absence of WDR81. The WDR81 gene, as a negative regulator of PI3K activity, prevents autophagy and increases exosome secretion by preventing the formation of the class III PI3K complex. Therefore, targeted reduction of exosomes can be considered an effective strategy for reducing the pathogenesis of glioblastoma. This study aimed to assess the effect of WDR81 gene silencing with siRNA on exosome levels in a U87-MG cell line. Culturing of U87-MG cells was carried out in Dulbecco’s modified Eagle medium (DMEM) containing 5% FBS and 1% penicillin/streptomycin. Thereafter, silencing of WDR81 was performed using WDR81 siRNA, whose gene expression level was determined via real-time qRT-PCR. Cell viability was evaluated using the MTT assay. The exosomes were extracted from a cell culture using the Exocib kit. The size accuracy of the exosomes was confirmed by dynamic light scattering (DLS). Finally, the protein content and RNA of the exosomes were assessed. WDR81 gene expression of siRNA-transfected cells was decreased to 82% after 24 h compared to the non-transfected control cells. The analysis of the exosomes showed that the concentration of exosomes and their RNA and protein content in the siRNA-transfected cells decreased significantly compared to the non-transfected control cells. No considerable difference was observed in cell viability after transfection with either WDR81-specific siRNAs or scrambled control siRNAs. Our findings showed that silencing the WDR81 gene could reduce the level of exosomes in human U87-MG glioblastoma cells. Therefore, the reduced exosome content may be suggested as a new gene therapy strategy for targeted therapy of glioblastoma by increasing autophagy via activation of PI3KIII. However, more studies are needed in this regard.

Iran, despite its size, geographic location and past cultural influence, has largely been a blind spot for human population genetic studies. With only sparse genetic information on the Iranian population available, we pursued its genome-wide and geographic characterization based on 1021 samples from eleven ethnic groups. We show that Iranians, while close to neighboring populations, present distinct genetic variation consistent with long-standing genetic continuity, harbor high heterogeneity and different levels of consanguinity, fall apart into a cluster of similar groups and several admixed ones and have experienced numerous language adoption events in the past. Our findings render Iran an important source for human genetic variation in Western and Central Asia, will guide adequate study sampling and assist the interpretation of putative disease-implicated genetic variation. Given Iran's internal genetic heterogeneity, future studies will have to consider ethnic affiliations and possible admixture.

Background Hereditary Spastic Paraplegia (HSP) is a rare neurodegenerative disorder causing progressive weakness and spasticity in the lower limbs. variants in the HPDL gene are linked to Spastic Paraplegia 83 (SPG83), an autosomal recessive form of HSP. While HPDL variants are known to cause SPG83, the molecular mechanisms behind its role remains unclear, mostly due to rare nature of the condition. Methods The primary objective was to identify the genetic cause of HSP in two Iranian consanguineous families. Whole-exome sequencing (WES) was employed to identify genetic variants in the probands. Molegro Virtual Docker (MVD), a cutting-edge integrated platform, was utilized to perform protein-ligand docking simulations. This approach aimed to characterize the structural and functional consequences of the identified variants associated with SPG83 pathogenicity. Results WES identified two biallelic variants in HPDL : c.3G > C, a start-loss variant abolishing the canonical initiation codon, and c.128G > C, a missense variant. The c.128G > C variant is novel and is documented here for the first time in an SPG83 patient. Trio-based co-segregation analysis confirmed inheritance of variants. Furthermore, a comprehensive literature review revealed a significant consanguinity rate (49.55%) within families harboring HPDL variants. Conclusion This study expands the genetic and clinical spectrum of HPDL variants. The identification of the genetic variants in the probands underscores the clinical value of genetic testing methods like WES as a valuable diagnostic tool.

Background Hearing Loss (HL) is the most common sensorineural condition in humans. Mutations in the TMPRSS3 gene ( DNFB8/10 locus) have been linked to autosomal recessive non-syndromic hearing loss (ARNSHL). Methods Whole-exome sequencing (WES) was utilized to identify disease-causing variants in a proband from Iran with ARNSHL who presented clinically with sensorineural, bilateral, and prelingual HL. The pathogenicity and novelty of the identified variant were assessed using various databases. A co-segregation study was also performed to confirm the presence of the variant in the proband’s parents. Additionally, the secondary and tertiary structures of the mutant TMPRSS3 protein were predicted using bioinformatics tools. Furthermore, a global mutational spectrum of TMPRSS3 was created and statistically analyzed. The Iranome database was also used to identify other putative mutations in the TMPRSS3 gene in the Iranian population. Results We identified a novel homozygous single nucleotide deletion in TMPRSS3 (c.297delA, p.Asp100ThrfsTer52) in the proband. This is the first report of this mutation in a patient with ARNSHL. Sanger sequencing confirmed that this variant co-segregated from the proband’s parents. Bioinformatic tools classified this novel variant as likely pathogenic. Additionally, 49.55% of families with TMPRSS3 -related HL patients were shown to have consanguinity, consistent with our study. The Iranome database also revealed the c.268G > A variant as a putative novel mutation in TMPRSS3 . Conclusion This research expanded the pool of evidence regarding the association between mutations in the TMPRSS3 gene and ARNSHL. The finding confirmed that a single nucleotide deletion caused HL in the proband, suggesting that genetic testing, such as WES, is a robust technique for diagnosing patients with this condition.

The cannabinoid system has been identified as a critical endogenous regulator of immune homeostasis through immunomodulatory actions. This system is one of the main regulatory systems of the central nervous system (CNS). Variations in the cannabinoid CB2 receptor gene (CNR2) could affect intracellular signaling and reduce system function, which has been associated with an unbalanced immune response and increased risk of a variety of autoimmune inflammatory disorders. The present study investigated the relationship between CNR2 rs35761398 (Q63R) functional variation and multiple sclerosis (MS). A total of 100 Iranian MS patients and 100 healthy controls were enrolled in the study and genotyped through TaqMan assay. The co-dominant, dominant, recessive, over-dominant, and additive inheritance models were analyzed using SNPStats software. A significant genetic association was observed between Q63R polymorphism and MS. The dominant model was accepted as the best inheritance model to fit the data (OR 2.70, 95% CI 1.47–4.97, p = 0.001). The data implied the involvement of the CNR2 gene in susceptibility to MS in Iranian patients.

Ehlers-Danlos syndrome (EDS), osteogenesis imperfecta (OI), and cutis laxa (CL) are three rare and heterogeneous connective tissue disorders. Patients with these syndromes have similar manifestations and unpredictable prognosis, making a misdiagnosis highly probable. Some of their subtypes are inherited in autosomal recessive patterns, so they are expected to be prevalent in populations like Iran, where consanguineous marriages are common. In the current work, a cohort of Iranian patients with overlapping phenotypes of the EDS/OI/CL and their mutation spectrum was defined. Based on this, in silico analysis was conducted to anticipate further probable genetic variations. Pathogenicity of EDS, OI, and CL variants in Iranian patients was evaluated using Web servers. A protein interaction network was created by String database and visualized using a Python-based library. The Iranome database was used to predict other genetic mutations in all reported genes of EDS, OI, and CL syndromes. In the EDS/OI/CL overlap phenotype, 32 variants in 18 genes have been involved. At least 59% of patients were from families with consanguineous marriages. Interaction analysis showed that COL1A1, COL1A2, CRTAP, LEPRE1, PLOD1, and ADAMTS2 have the most significant impact within the protein network of EDS/OI/CL overlap phenotype. Analyzing the Iranome database revealed 46 variants of EDS, OI, and CL genes potentially disease causing. The overlapping phenotype of EDS, OI, and CL syndromes requires genetic testing (e.g., whole-exome sequencing) to reveal respective variants, which helps to diagnose more accurately and manage the disease more effectively. Particularly in populations with high rates of consanguineous marriages, such as Iran, genetic screening plays a crucial role in premarital and prenatal counseling to prevent the transmission of these rare connective tissue disorders.