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1.
Cytogenet Genome Res ; 162(1-2): 46-54, 2022.
Article in English | MEDLINE | ID: mdl-35290978

ABSTRACT

Langer-Giedion syndrome (LGS) is caused by a contiguous deletion at 8q23q24, characterized by exostoses, facial, ectodermal, and skeletal anomalies, and, occasionally, intellectual disability. LGS patients have been diagnosed clinically or by routine cytogenetic techniques, hampering the definition of an accurate genotype-phenotype correlation for the syndrome. We report two unrelated patients with 8q23q24 deletions, characterized by cytogenomic techniques, with one of them, to our knowledge, carrying the smallest deletion reported in classic LGS cases. We assessed the pathogenicity of the deletion of genes within the 8q23q24 region and reviewed other molecularly confirmed cases from the literature. Our findings suggest a 3.2-Mb critical region for a typical presentation of the syndrome, emphasizing the contribution of the TRPS1, RAD21, and EXT1 genes' haploinsufficiency, and facial dysmorphisms as well as bone anomalies as the most frequent features among patients with LGS. We also suggest a possible role for the CSMD3 gene, whose deletion seems to contribute to central nervous system anomalies. Since studies performing such correlation for LGS patients are limited, our data contribute to improving the ge-notype-phenotype characterization for LGS patients.


Subject(s)
Langer-Giedion Syndrome , Chromosome Deletion , Chromosomes, Human, Pair 8 , Comparative Genomic Hybridization , Genetic Association Studies , Haploinsufficiency , Humans , Langer-Giedion Syndrome/diagnosis , Langer-Giedion Syndrome/genetics , Phenotype , Repressor Proteins/genetics
2.
Am J Med Genet A ; 185(11): 3284-3286, 2021 11.
Article in English | MEDLINE | ID: mdl-34492150

ABSTRACT

Online Mendelian Inheritance in Man (OMIM®), an online catalog of human genes and genetic disorders, has been used in the low- and middle-income countries largely as a tool for improving clinical care, teaching genetics and genomics, and for clinical and research analysis of next-generation sequencing. By facilitating free access to curated, updated, and comprehensive information in genetics and genomics, OMIM has led to better clinical care and research advancement in countries where clinicians and researchers in private or public hospitals and universities cannot afford to pay for other resources including journal subscriptions.


Subject(s)
Databases, Genetic/economics , Genetic Diseases, Inborn/genetics , Genetics, Medical/economics , Chromosome Mapping , Developing Countries/economics , Genetic Diseases, Inborn/economics , Genetic Diseases, Inborn/epidemiology , Genomics/economics , High-Throughput Nucleotide Sequencing/economics , Humans , Mass Screening/economics , Phenotype
3.
Am J Med Genet A ; 185(8): 2295-2305, 2021 08.
Article in English | MEDLINE | ID: mdl-33913603

ABSTRACT

Patients with unbalanced X-autosome translocations are rare and usually present a skewed X-chromosome inactivation (XCI) pattern, with the derivative chromosome being preferentially inactivated, and with a possible spread of XCI into the autosomal regions attached to it, which can inactivate autosomal genes and affect the patients' phenotype. We describe three patients carrying different unbalanced X-autosome translocations, confirmed by G-banding karyotype and array techniques. We analyzed their XCI pattern and inactivation spread into autosomal regions, through HUMARA, ZDHHC15 gene assay and the novel 5-ethynyl-2'-deoxyuridine (EdU) incorporation assay, and identified an extremely skewed XCI pattern toward the derivative chromosomes for all the patients, and a variable pattern of late-replication on the autosomal regions of the derivative chromosomes. All patients showed phenotypical overlap with patients presenting deletions of the autosomal late-replicating regions, suggesting that the inactivation of autosomal segments may be responsible for their phenotype. Our data highlight the importance of the XCI spread into autosomal regions for establishing the clinical picture in patients carrying unbalanced X-autosome translocations, and the incorporation of EdU as a novel and precise tool to evaluate the inactivation status in such patients.


Subject(s)
Chromosome Disorders/diagnosis , Chromosome Disorders/genetics , Chromosomes , Genetic Association Studies , Phenotype , Translocation, Genetic , X Chromosome Inactivation , Comparative Genomic Hybridization , Cytogenetic Analysis , DNA Replication , DNA-Binding Proteins/genetics , Evolution, Molecular , Humans , In Situ Hybridization, Fluorescence , Receptors, Androgen/genetics
4.
Am J Med Genet A ; 185(7): 2056-2064, 2021 07.
Article in English | MEDLINE | ID: mdl-33880880

ABSTRACT

Oculo-auriculo-vertebral spectrum (OAVS) is a developmental disorder characterized by anomalies mainly involving the structures derived from the first and second pharyngeal arches. The spectrum presents with heterogeneous clinical features and complex etiology with genetic factors not yet completely understood. To date, MYT1 is the most important gene unambiguously associated with the spectrum and with functional data confirmation. In this work, we aimed to identify new single nucleotide variants (SNVs) affecting MYT1 in a cohort of 73 Brazilian patients diagnosed with OAVS. In addition, we investigated copy number variations (CNVs) encompassing this gene or its cis-regulatory elements and compared the frequency of these events in patients versus a cohort of 455 Brazilian control individuals. A new SNV, predicted as likely deleterious, was identified in five unrelated patients with OAVS. All five patients presented hearing impairment and orbital asymmetry suggesting an association with the variant. CNVs near MYT1, located in its neighboring topologically associating domain (TAD), were found to be enriched in patients when compared to controls, indicating a possible involvement of this region with OAVS pathogenicity. Our findings highlight the genetic complexity of the spectrum that seems to involve more than one variant type and inheritance patterns.


Subject(s)
DNA-Binding Proteins/genetics , Genetic Predisposition to Disease , Goldenhar Syndrome/genetics , Transcription Factors/genetics , Branchial Region/pathology , Brazil/epidemiology , DNA Copy Number Variations/genetics , Female , Goldenhar Syndrome/epidemiology , Goldenhar Syndrome/pathology , Humans , Male , Phenotype , Polymorphism, Single Nucleotide/genetics
5.
Am J Med Genet A ; 185(4): 1047-1058, 2021 04.
Article in English | MEDLINE | ID: mdl-33381921

ABSTRACT

We aim to characterize patients with Gomez-López-Hernández syndrome (GLHS) clinically and to investigate them molecularly. A clinical protocol, including a morphological and neuropsychological assessment, was applied to 13 patients with GLHS. Single-nucleotide polymorphism (SNP) array and whole-exome sequencing were undertaken; magnetic resonance imaging was performed in 12 patients, including high-resolution, heavily T2-weighted sequences (HRT2) in 6 patients to analyze the trigeminal nerves. All patients presented alopecia; two did not present rhombencephalosynapsis (RES); trigeminal anesthesia was present in 5 of the 11 patients (45.4%); brachycephaly/brachyturricephaly and mid-face retrusion were found in 84.6 and 92.3% of the patients, respectively. One patient had intellectual disability. HRT2 sequences showed trigeminal nerve hypoplasia in four of the six patients; all four had clinical signs of trigeminal anesthesia. No common candidate gene was found to explain GLHS phenotype. RES does not seem to be an obligatory finding in respect of GLHS diagnosis. We propose that a diagnosis of GLHS should be considered in patients with at least two of the following criteria: focal non-scarring alopecia, rhombencephalosynapsis, craniofacial anomalies (brachyturrycephaly, brachycephaly or mid-face retrusion), trigeminal anesthesia or anatomic abnormalities of the trigeminal nerve. Studies focusing on germline whole genome sequencing or DNA and/or RNA sequencing of the alopecia tissue may be the next step for the better understanding of GLHS etiology.


Subject(s)
Abnormalities, Multiple/genetics , Acid Phosphatase/genetics , Alopecia/genetics , Cerebellum/abnormalities , Craniofacial Abnormalities/genetics , Exome Sequencing , Growth Disorders/genetics , Neurocutaneous Syndromes/genetics , Abnormalities, Multiple/diagnosis , Abnormalities, Multiple/diagnostic imaging , Abnormalities, Multiple/pathology , Adolescent , Adult , Alopecia/diagnosis , Alopecia/diagnostic imaging , Alopecia/pathology , Brazil/epidemiology , Cerebellum/diagnostic imaging , Cerebellum/pathology , Child , Child, Preschool , Craniofacial Abnormalities/diagnosis , Craniofacial Abnormalities/diagnostic imaging , Craniofacial Abnormalities/pathology , Female , Growth Disorders/diagnosis , Growth Disorders/diagnostic imaging , Growth Disorders/pathology , Humans , Infant , Infant, Newborn , Magnetic Resonance Imaging , Male , Neurocutaneous Syndromes/diagnosis , Neurocutaneous Syndromes/diagnostic imaging , Neurocutaneous Syndromes/pathology , Phenotype , Polymorphism, Single Nucleotide/genetics , Rhombencephalon/diagnostic imaging , Rhombencephalon/pathology , Trigeminal Nerve/diagnostic imaging , Trigeminal Nerve/metabolism , Trigeminal Nerve/pathology , Young Adult
6.
Am J Med Genet A ; 182(12): 3029-3034, 2020 12.
Article in English | MEDLINE | ID: mdl-33010201

ABSTRACT

Kenny-Caffey syndrome (KCS) is a rare hereditary skeletal disorder involving hypoparathyroidism. The autosomal dominant form (KCS2), caused by heterozygous pathogenic variants in the FAM111A gene, is distinguished from the autosomal recessive form (KCS1) and Sanjad-Sakati syndrome (SSS), both caused by pathogenic variants in the tubulin folding cofactor E (TBCE) gene, by the absence of microcephaly and intellectual disability. We present a patient with KCS2 caused by a de novo pathogenic variant c.1706G>A (p.Arg569His) in FAM111A gene, presenting intellectual disability and microcephaly, which are considered to be typical signs of SSS. We suggest that KCS1, KCS2, and SSS may not represent mutually exclusive clinical entities, but possibly an overlapping spectrum.


Subject(s)
Abnormalities, Multiple/pathology , Dwarfism/pathology , Growth Disorders/pathology , Hyperostosis, Cortical, Congenital/pathology , Hypocalcemia/pathology , Hypoparathyroidism/pathology , Intellectual Disability/pathology , Mutation , Osteochondrodysplasias/pathology , Phenotype , Receptors, Virus/genetics , Seizures/pathology , Abnormalities, Multiple/genetics , Adolescent , Dwarfism/complications , Dwarfism/genetics , Growth Disorders/complications , Growth Disorders/genetics , Humans , Hyperostosis, Cortical, Congenital/complications , Hyperostosis, Cortical, Congenital/genetics , Hypocalcemia/complications , Hypocalcemia/genetics , Hypoparathyroidism/complications , Hypoparathyroidism/genetics , Intellectual Disability/complications , Intellectual Disability/genetics , Male , Osteochondrodysplasias/complications , Osteochondrodysplasias/genetics , Seizures/complications , Seizures/genetics
7.
Am J Med Genet A ; 182(7): 1761-1766, 2020 07.
Article in English | MEDLINE | ID: mdl-32302043

ABSTRACT

Gomez-López-Hernández syndrome (GLHS) is characterized by rhombencephalosynapsis (RES), alopecia, trigeminal anesthesia and a distinctive phenotype, including brachyturricephaly. It has been suggested that GLHS should be considered as part of the spectrum of RES-associated conditions that include alopecia, trigeminal anesthesia, and craniofacial anomalies, rather than a distinct entity. To the best of our knowledge, 57 patients with GLHS have been described. Despite its first description in 1979, the etiology of this syndrome remains unknown. Here, we describe, to our knowledge, the first case of a patient with GLHS who was molecularly evaluated and had been prenatally exposed to misoprostol. We also reviewed the clinical and morphological features of the patients described to date to better delineate the phenotype and focus on any evidence for adverse pregnancy outcomes or exposure, including teratogens.


Subject(s)
Abnormalities, Multiple/drug therapy , Abnormalities, Multiple/genetics , Alopecia/genetics , Cerebellum/abnormalities , Craniofacial Abnormalities/drug therapy , Craniofacial Abnormalities/genetics , Growth Disorders/drug therapy , Growth Disorders/genetics , Misoprostol/therapeutic use , Neurocutaneous Syndromes/drug therapy , Neurocutaneous Syndromes/genetics , Abnormalities, Multiple/diagnostic imaging , Abnormalities, Multiple/pathology , Alopecia/diagnostic imaging , Alopecia/drug therapy , Alopecia/pathology , Cerebellum/diagnostic imaging , Cerebellum/pathology , Child , Child, Preschool , Craniofacial Abnormalities/diagnostic imaging , Craniofacial Abnormalities/pathology , Female , Growth Disorders/diagnostic imaging , Growth Disorders/pathology , Humans , Magnetic Resonance Imaging , Neurocutaneous Syndromes/diagnostic imaging , Neurocutaneous Syndromes/pathology , Phenotype , Rhombencephalon/diagnostic imaging , Rhombencephalon/pathology , Trigeminal Nerve/diagnostic imaging , Trigeminal Nerve/drug effects , Trigeminal Nerve/pathology
8.
Am J Hum Genet ; 92(4): 621-6, 2013 Apr 04.
Article in English | MEDLINE | ID: mdl-23541344

ABSTRACT

Scalp-ear-nipple (SEN) syndrome is a rare, autosomal-dominant disorder characterized by cutis aplasia of the scalp; minor anomalies of the external ears, digits, and nails; and malformations of the breast. We used linkage analysis and exome sequencing of a multiplex family affected by SEN syndrome to identify potassium-channel tetramerization-domain-containing 1 (KCTD1) mutations that cause SEN syndrome. Evaluation of a total of ten families affected by SEN syndrome revealed KCTD1 missense mutations in each family tested. All of the mutations occurred in a KCTD1 region encoding a highly conserved bric-a-brac, tram track, and broad complex (BTB) domain that is required for transcriptional repressor activity. KCTD1 inhibits the transactivation of the transcription factor AP-2α (TFAP2A) via its BTB domain, and mutations in TFAP2A cause cutis aplasia in individuals with branchiooculofacial syndrome (BOFS), suggesting a potential overlap in the pathogenesis of SEN syndrome and BOFS. The identification of KCTD1 mutations in SEN syndrome reveals a role for this BTB-domain-containing transcriptional repressor during ectodermal development.


Subject(s)
Abnormalities, Multiple/etiology , Branchio-Oto-Renal Syndrome/etiology , Ectodermal Dysplasia/etiology , Exome/genetics , Hypospadias/etiology , Muscle Hypotonia/etiology , Mutation, Missense/genetics , Repressor Proteins/genetics , Abnormalities, Multiple/pathology , Amino Acid Sequence , Branchio-Oto-Renal Syndrome/pathology , Co-Repressor Proteins , Ear, External/abnormalities , Ear, External/pathology , Ectodermal Dysplasia/pathology , Female , Humans , Hypospadias/pathology , Male , Molecular Sequence Data , Muscle Hypotonia/pathology , Nipples/abnormalities , Nipples/pathology , Pedigree , Phenotype , Protein Structure, Tertiary , Scalp/abnormalities , Scalp/pathology , Sequence Homology, Amino Acid
9.
Cardiol Young ; 26(7): 1274-81, 2016 Oct.
Article in English | MEDLINE | ID: mdl-26521836

ABSTRACT

BACKGROUND: Marfan syndrome patients present important cardiac structural changes, ventricular dysfunction, and electrocardiographic changes. An abnormal heart rate response during or after exercise is an independent predictor of mortality and autonomic dysfunction. The aim of the present study was to compare heart rate recovery and chronotropic response obtained by cardiac reserve in patients with Marfan syndrome subjected to submaximal exercise. METHODS: A total of 12 patients on ß-blocker therapy and 13 off ß-blocker therapy were compared with 12 healthy controls. They were subjected to submaximal exercise with lactate measurements. The heart rate recovery was obtained in the first minute of recovery and corrected for cardiac reserve and peak lactate concentration. RESULTS: Peak heart rate (141±16 versus 155±17 versus 174±8 bpm; p=0.001), heart rate reserve (58.7±9.4 versus 67.6±14.3 versus 82.6±4.8 bpm; p=0.001), heart rate recovery (22±6 versus 22±8 versus 34±9 bpm; p=0.001), and heart rate recovery/lactate (3±1 versus 3±1 versus 5±1 bpm/mmol/L; p=0.003) were different between Marfan groups and controls, respectively. All the patients with Marfan syndrome had heart rate recovery values below the mean observed in the control group. The absolute values of heart rate recovery were strongly correlated with the heart rate reserve (r=0.76; p=0.001). CONCLUSION: Marfan syndrome patients have reduced heart rate recovery and chronotropic deficit after submaximal exercise, and the chronotropic deficit is a strong determinant of heart rate recovery. These changes are suggestive of autonomic dysfunction.


Subject(s)
Autonomic Nervous System/physiopathology , Exercise Tolerance , Exercise , Heart Rate , Marfan Syndrome/physiopathology , Adolescent , Adrenergic beta-Antagonists/therapeutic use , Adult , Brazil , Case-Control Studies , Child , Exercise Test , Female , Humans , Male , Marfan Syndrome/drug therapy , Young Adult
10.
BMC Med Genet ; 15: 142, 2014 Dec 20.
Article in English | MEDLINE | ID: mdl-25526829

ABSTRACT

BACKGROUND: Trisomy 9p is one of the most common partial trisomies found in newborns. We report the clinical features and cytogenomic findings in five patients with different chromosome rearrangements resulting in complete 9p duplication, three of them involving 9p centromere alterations. METHODS: The rearrangements in the patients were characterized by G-banding, SNP-array and fluorescent in situ hybridization (FISH) with different probes. RESULTS: Two patients presented de novo dicentric chromosomes: der(9;15)t(9;15)(p11.2;p13) and der(9;21)t(9;21)(p13.1;p13.1). One patient presented two concomitant rearranged chromosomes: a der(12)t(9;12)(q21.13;p13.33) and an psu i(9)(p10) which showed FISH centromeric signal smaller than in the normal chromosome 9. Besides the duplication 9p24.3p13.1, array revealed a 7.3 Mb deletion in 9q13q21.13 in this patient. The break in the psu i(9)(p10) probably occurred in the centromere resulting in a smaller centromere and with part of the 9q translocated to the distal 12p with the deletion 9q occurring during this rearrangement. Two patients, brother and sister, present 9p duplication concomitant to 18p deletion due to an inherited der(18)t(9;18)(p11.2;p11.31)mat. CONCLUSIONS: The patients with trisomy 9p present a well-recognizable phenotype due to facial appearance, although the genotype-phenotype correlation can be difficult due to concomitant partial monosomy of other chromosomes. The chromosome 9 is rich in segmental duplication, especially in pericentromeric region, with high degree of sequence identity to sequences in 15p, 18p and 21p, chromosomes involved in our rearrangements. Thus, we suggest that chromosome 9 is prone to illegitimate recombination, either intrachromosomal or interchromosomal, which predisposes it to rearrangements, frequently involving pericentromeric regions.


Subject(s)
Trisomy/genetics , Adolescent , Child , Chromosomes, Human, Pair 9/genetics , Female , Genetic Association Studies , Humans , In Situ Hybridization, Fluorescence , Male , Oligonucleotide Array Sequence Analysis , Phenotype , Recombination, Genetic , Translocation, Genetic
11.
J Med Virol ; 86(9): 1576-83, 2014 Sep.
Article in English | MEDLINE | ID: mdl-24615872

ABSTRACT

El Salvador is a Central American country that has been affected by several dengue outbreaks. This study investigated the levels of IgM, IgA, and IgE anti-dengue antibodies in serum samples from children in El Salvador, with a clinical and serological diagnosis of dengue infection during the dengue 4 outbreak in 2002-2003. Seventy one serum samples were tested by ELISA and cases were classified in three groups: 13 primary dengue fever (PDF), 21 secondary dengue fever (SDF), and 37 secondary dengue hemorrhagic fever (SDHF). Also, the specificity of anti-dengue IgM for the different serotypes was tested. No significant differences in the IgM response were found between PDF and SDF, but these were detected between PDF and SDHF (P = 0.0053) and between SDF and SDHF (P = 0.0003). The IgA and IgE values showed a statistically significant difference between primary and secondary groups. The highest positivity percentage of IgA was between 95% (SDF) and 100% (SDHF) towards day 7 of onset of fever. All secondary cases were positive for IgE antibodies. The specificity of IgM was determined for DENV-4 virus in primary and secondary DF groups. This is the first study on dengue cases in Salvadorian children related to the immune response of different immunoglobulins to the type of infection and the clinical picture. Further prospective studies are needed to define if the pattern of immunoglobulins can determine early dengue infection and/or severity.


Subject(s)
Antibodies, Viral/blood , Dengue Virus/immunology , Immunoglobulin A/blood , Immunoglobulin E/blood , Immunoglobulin M/blood , Severe Dengue/blood , Child , Dengue Virus/genetics , Disease Outbreaks , El Salvador/epidemiology , Humans , Severe Dengue/epidemiology , Severe Dengue/immunology
12.
Am J Med Genet A ; 164A(5): 1170-4, 2014 May.
Article in English | MEDLINE | ID: mdl-24478002

ABSTRACT

Van den Ende-Gupta Syndrome (VDEGS) is an autosomal recessive disorder characterized by blepharophimosis, distinctive nose, hypoplastic maxilla, and skeletal abnormalities. Using homozygosity mapping in four VDEGS patients from three consanguineous families, Anastacio et al. [Anastacio et al. (2010); Am J Hum Genet 87:553-559] identified homozygous mutations in SCARF2, located at 22q11.2. Bedeschi et al. [2010] described a VDEGS patient with sclerocornea and cataracts with compound heterozygosity for the common 22q11.2 microdeletion and a hemizygous SCARF2 mutation. Because sclerocornea had been described in DiGeorge-velo-cardio-facial syndrome but not in VDEGS, they suggested that the ocular abnormalities were caused by the 22q11.2 microdeletion. We report on a 23-year-old male who presented with bilateral sclerocornea and the VDGEGS phenotype who was subsequently found to be homozygous for a 17 bp deletion in exon 4 of SCARF2. The occurrence of bilateral sclerocornea in our patient together with that of Bedeschi et al., suggests that the full VDEGS phenotype may include sclerocornea resulting from homozygosity or compound heterozygosity for loss of function variants in SCARF2.


Subject(s)
Abnormalities, Multiple/diagnosis , Abnormalities, Multiple/genetics , Arachnodactyly/diagnosis , Arachnodactyly/genetics , Blepharophimosis/diagnosis , Blepharophimosis/genetics , Contracture/diagnosis , Contracture/genetics , Cornea/abnormalities , Corneal Diseases/diagnosis , Corneal Diseases/genetics , Homozygote , Scavenger Receptors, Class F/genetics , Sequence Deletion , Adult , Bone and Bones/diagnostic imaging , Bone and Bones/pathology , Chromosomes, Human, Pair 22 , Exons , Facies , Hand Deformities, Congenital , Humans , Male , Phenotype , Radiography , Sequence Analysis, DNA , Young Adult
13.
Virus Genes ; 49(2): 185-95, 2014 Oct.
Article in English | MEDLINE | ID: mdl-24854144

ABSTRACT

The NS3 protein is a multifunctional non-structural protein of flaviviruses implicated in the polyprotein processing. The predominance of cytotoxic T cell lymphocytes epitopes on the NS3 protein suggests a protective role of this protein in limiting virus replication. In this work, we studied the antigenicity and immunogenicity of a recombinant NS3 protein of the Dengue virus 2. The full-length NS3 gene was cloned and expressed as a His-tagged fusion protein in Escherichia coli. The pNS3 protein was purified by two chromatography steps. The recombinant NS3 protein was recognized by anti-protease NS3 polyclonal antibody and anti-DENV2 HMAF by Western Blot. This purified protein was able to stimulate the secretion of high levels of gamma interferon and low levels of interleukin-10 and tumor necrosis factor-α in mice splenocytes, suggesting a predominantly Th-1-type T cell response. Immunized BALB/c mice with the purified NS3 protein showed a strong induction of anti-NS3 IgG antibodies, essentially IgG2b, as determined by ELISA. Immunized mice sera with recombinant NS3 protein showed specific recognition of native dengue protein by Western blotting and immunofluorescence techniques. The successfully purified recombinant protein was able to preserv the structural and antigenic determinants of the native dengue protein. The antigenicity shown by the recombinant NS3 protein suggests its possible inclusion into future DENV vaccine preparations.


Subject(s)
Dengue Vaccines/immunology , Dengue Virus/immunology , Vaccines, Synthetic/immunology , Viral Nonstructural Proteins/immunology , Animals , Antibodies, Viral/blood , Blotting, Western , Cloning, Molecular , Dengue Vaccines/administration & dosage , Dengue Vaccines/genetics , Dengue Vaccines/isolation & purification , Dengue Virus/genetics , Enzyme-Linked Immunosorbent Assay , Escherichia coli/genetics , Female , Fluorescent Antibody Technique , Gene Expression , Interferon-gamma/metabolism , Interleukin-10/metabolism , Leukocytes, Mononuclear/immunology , Mice, Inbred BALB C , RNA Helicases/genetics , RNA Helicases/immunology , Recombinant Proteins/genetics , Recombinant Proteins/immunology , Recombinant Proteins/isolation & purification , Serine Endopeptidases/genetics , Serine Endopeptidases/immunology , Tumor Necrosis Factor-alpha/metabolism , Vaccines, Synthetic/administration & dosage , Vaccines, Synthetic/genetics , Vaccines, Synthetic/isolation & purification , Viral Nonstructural Proteins/genetics
14.
Am J Med Genet A ; 161A(3): 479-86, 2013 Mar.
Article in English | MEDLINE | ID: mdl-23401328

ABSTRACT

Obesity is a major threat to public health worldwide, and there is now mounting evidence favoring a role for the central nervous system (CNS) in weight control. A causal relationship has been recognized in both monogenic (e.g., BDNF, TRKB, and SIM1 deficiencies) and syndromic forms of obesity [e.g., Prader-Willi syndrome (PWS)]. Syndromic obesity arising from chromosomal abnormalities, that typically also affect learning and development, are often associated with congenital malformations and behavioral characteristics. We report on nine unrelated patients with a diagnosis of learning disability and/or developmental delay (DD) in addition to obesity that were found to have copy number variants (CNVs) by single nucleotide polymorphism array-based analysis. Each patient also had a distinct and complex phenotype, and most had hypotonia and other neuroendocrine issues, such as hyperphagia and hypogonadism. Molecular and clinical characterization of these patients enabled us to determine with confidence that the CNVs we observed were pathogenic or likely to be pathogenic. Overall, the CNVs reported here encompassed a candidate gene or region (e.g., SIM1) that has been reported in patients associating obesity and DD and/or intellectual disability (ID) and novel candidate genes and regions.


Subject(s)
Abnormalities, Multiple/diagnosis , DNA Copy Number Variations , Developmental Disabilities/diagnosis , Learning Disabilities/diagnosis , Obesity/diagnosis , Abnormalities, Multiple/genetics , Adolescent , Child , Child, Preschool , Developmental Disabilities/genetics , Female , Humans , Infant , Learning Disabilities/genetics , Male , Molecular Diagnostic Techniques , Obesity/genetics , Oligonucleotide Array Sequence Analysis , Polymorphism, Single Nucleotide
15.
Clin Ophthalmol ; 17: 2333-2339, 2023.
Article in English | MEDLINE | ID: mdl-37600146

ABSTRACT

Purpose: To compare magnification and refocusing during phacoemulsification with the NGENUITY®â€¯3-D Visualization System (3-D) versus the conventional microscope (CM) OPMI LUMERA 700. Setting: This study was performed in the Department of Anterior Segment of the Fundación Hospital Nuestra Señora de la Luz. Design: Prospective, randomized, cross-sectional, multi-surgeon, and comparative study. Methods: This study enrolled 100 patients (eyes) scheduled for phacoemulsification to measure the number of times changes in focusing and magnification were needed during cataract surgery. Results: Our study included 100 patients. From the endpoints evaluated, "zoom-in" showed statistically significant differences for all of the four predefined cataract surgery steps (means: Step 1, 0.38 (CM) vs 0.08 (3-D); Step 2, 0.36 (CM) vs 0.06 (3-D); Step 3, 0.54 (CM) vs 0.22 (3-D); Step 4, 0.56 (CM) vs 0.24 (3-D); all comparisons, p <0.05). In Step 4, there was a statistically significant increased use of "focus-out" for the 3-D system (mean 0.16 (CM) vs 0.58 (3-D); p <0.05). "Focus-in" and "zoom-out" showed no group differences for all steps. The duration of surgery with the 3-D system was longer at each step and overall. The percentage of light intensity did not show a statistically significant difference between both systems, with a mean of 99.45 for CM vs 98.43% for the heads-up system. Conclusion: The heads-up 3-D system is a safe option that offers excellent magnification for anterior segment visualization. The surgical time is longer, but adjusting settings like light intensity and brightness may facilitate some surgical steps early in the learning curve.

16.
Rev Paul Pediatr ; 41: e2022057, 2023.
Article in English | MEDLINE | ID: mdl-37042943

ABSTRACT

OBJECTIVE: The classic triad, which defines IFAP syndrome, is ichthyosis follicularis, alopecia, and photophobia. It is a rare X-linked genetic disorder characterized by multiple congenital anomalies with variable severity, caused by pathogenic variants in the MBTPS2 gene, which encodes a zinc metalloprotease that is essential for normal development. This study aimed to report a case of a Brazilian patient with IFAP syndrome presenting skeletal anomalies, which is a rare finding among patients from different families. CASE DESCRIPTION: We describe a male proband with IFAP syndrome showing severe ichthyosis congenita, cryptorchidism, limb malformation, and comprising the BRESHECK syndrome features. Using whole-exome sequencing, we identified a rare missense variant in hemizygosity in the MBTPS2 gene, which had not been identified in other family members. COMMENTS: This is the first diagnosis of IFAP syndrome in Brazil with a molecular investigation. The present case study thus expands our knowledge on the mutational spectrum of MBPTS2 associated with IFAP syndrome.


Subject(s)
Ichthyosis, Lamellar , Ichthyosis , Humans , Male , Ichthyosis, Lamellar/complications , Ichthyosis, Lamellar/diagnosis , Ichthyosis, Lamellar/genetics , Brazil , Metalloendopeptidases/genetics , Ichthyosis/complications , Ichthyosis/diagnosis , Ichthyosis/genetics , Alopecia/diagnosis , Alopecia/genetics , Alopecia/pathology , Syndrome
17.
Stem Cell Res ; 54: 102407, 2021 07.
Article in English | MEDLINE | ID: mdl-34062330

ABSTRACT

Marfan Syndrome (MFS) is a pleiotropic and autosomal dominant condition caused by pathogenic variants in FBN1. Although fully penetrant, clinical variability is frequently observed among patients and there are only few genotype-phenotype correlations described so far. Here, we describe the generation and characterization of hiPSC lines derived from two unrelated MFS patients harboring heterozygous variants in FBN1. Human iPSCs were obtained from erythroblasts reprogrammed with episomal vectors carrying the reprogramming factors OCT4, SOX2, KLF4, c-MYC and LIN-28, and characterized according to established criteria. Differentiated cells demonstrated different patterns of fibrillin-1 expression suggesting different molecular mechanisms between the two patients.


Subject(s)
Induced Pluripotent Stem Cells , Marfan Syndrome , Cell Differentiation , Cell Line , Fibrillin-1/genetics , Heterozygote , Humans , Kruppel-Like Factor 4 , Marfan Syndrome/genetics , Mutation
18.
Rev Paul Pediatr ; 38: e2018318, 2020.
Article in English, Portuguese | MEDLINE | ID: mdl-31939516

ABSTRACT

OBJECTIVE: For every 100 random children diagnosed with autism, at least 20 have morphological abnormalities, often associated with syndromes. Brazil does not have a standardized and validated instrument for morphological physical examination. This study aimed to translate into Brazilian Portuguese and culturally adapt the clinical signs described in the Autism Dysmorphology Measure, as well as validate the instrument in a sample of children with autism. METHODS: The original instrument was translated, culturally adapted, and published in full, following traditional procedures for translation, back-translation, and terminology adaptation according to the Nomina Anatomica. The sample included 62 children from a published multicenter study, with intelligence quotient between 50-69, of both genders, with chronological age between 3-6 years. Two clinical geneticists performed the morphological physical examination, which consisted of investigating 82 characteristics assessing 12 body areas. We used Cohen's Kappa coefficient to evaluate the agreement between the two observers. RESULTS: The final version of the instrument - translated into Brazilian Portuguese and culturally adapted - showed high agreement between the two observers. CONCLUSIONS: The translated instrument meets all international criteria, and minor anomalies and their clinical descriptions were standardized and are recognizable for physicians not specialized in genetics.


Subject(s)
Adaptation, Psychological/physiology , Autism Spectrum Disorder/psychology , Congenital Abnormalities/diagnosis , Physical Examination/methods , Autism Spectrum Disorder/diagnosis , Autism Spectrum Disorder/genetics , Body Dysmorphic Disorders/psychology , Brazil/epidemiology , Child , Child, Preschool , Congenital Abnormalities/genetics , Cultural Characteristics , Female , Humans , Male , Reproducibility of Results , Surveys and Questionnaires , Translations
19.
J Neurodev Disord ; 11(1): 13, 2019 07 18.
Article in English | MEDLINE | ID: mdl-31319798

ABSTRACT

BACKGROUND: Phelan-McDermid syndrome (PMS) is a rare genetic disorder characterized by global developmental delay, intellectual disability (ID), autism spectrum disorder (ASD), and mild dysmorphisms associated with several comorbidities caused by SHANK3 loss-of-function mutations. Although SHANK3 haploinsufficiency has been associated with the major neurological symptoms of PMS, it cannot explain the clinical variability seen among individuals. Our goals were to characterize a Brazilian cohort of PMS individuals, explore the genotype-phenotype correlation underlying this syndrome, and describe an atypical individual with mild phenotype. METHODOLOGY: A total of 34 PMS individuals were clinically and genetically evaluated. Data were obtained by a questionnaire answered by parents, and dysmorphic features were assessed via photographic evaluation. We analyzed 22q13.3 deletions and other potentially pathogenic copy number variants (CNVs) and also performed genotype-phenotype correlation analysis to determine whether comorbidities, speech status, and ASD correlate to deletion size. Finally, a Brazilian cohort of 829 ASD individuals and another independent cohort of 2297 ID individuals was used to determine the frequency of PMS in these disorders. RESULTS: Our data showed that 21% (6/29) of the PMS individuals presented an additional rare CNV, which may contribute to clinical variability in PMS. Increased pain tolerance (80%), hypotonia (85%), and sparse eyebrows (80%) were prominent clinical features. An atypical case diagnosed with PMS at 18 years old and IQ within the normal range is here described. Among Brazilian ASD or ID individuals referred to CNV analyses, the frequency of 22q13.3 deletion was 0.6% (5/829) and 0.61% (15/2297), respectively. Finally, renal abnormalities, lymphedema, and language impairment were found to be positively associated with deletion sizes, and the minimum deletion to cause these abnormalities is here suggested. CONCLUSIONS: This is the first work describing a cohort of Brazilian individuals with PMS. Our results confirm the impact of 22q13 deletions on ASD and several comorbidities, such as hypotonia. The estimation of a minimal deletion size for developing lymphedema and renal problem can assist prediction of prognosis in PMS individuals, particularly those diagnosed in early infancy. We also identified one atypical individual carrying SHANK3 deletion, suggesting that resilience to such mutations occurs. This case expands the clinical spectrum of variability in PMS and opens perspectives to identify protective mechanisms that can minimize the severity of this condition.


Subject(s)
Autism Spectrum Disorder , Genetic Association Studies , Adolescent , Adult , Autism Spectrum Disorder/etiology , Autism Spectrum Disorder/genetics , Autism Spectrum Disorder/physiopathology , Brazil , Child , Child, Preschool , Chromosome Deletion , Chromosome Disorders/complications , Chromosome Disorders/genetics , Chromosome Disorders/physiopathology , Chromosomes, Human, Pair 22/genetics , Cohort Studies , DNA Copy Number Variations/genetics , Female , Humans , Infant , Male , Nerve Tissue Proteins/genetics , Young Adult
20.
Am J Med Genet A ; 146A(13): 1725-8, 2008 Jul 01.
Article in English | MEDLINE | ID: mdl-18512233

ABSTRACT

Nonsyndromic syndactyly is a common, heterogeneous hereditary condition of webbed fingers and toes that can be cutaneous or bony, unilateral or bilateral. We describe a patient with complex toe syndactyly and oligodactyly, some interesting skeletal hand findings and atypical facial features without other case like this described before. Cenani-Lenz syndrome (CLS) is a rare disorder with total syndactyly and irregular synostosis of carpal, metacarpal and phalanges, it may involve ulna and radius and digital rays may be absent, some of these were described with atypical facial features and one patient had renal hypoplasia and vertebral anomalies but our patient does not have the oligodactyly or syndactyly of the hands that is consistently present in all patients with CLS. The atypical facial features of our patient resemble Kabuki syndrome but oligodactyly and complex syndactyly have not been described in Kabuki syndrome and this patient has normal intelligence, and extreme eyelid defect (resembling ablepharon). Therefore, for our patient, we suggested to treat in a new condition of limb anomalies and atypical face.


Subject(s)
Abnormalities, Multiple/genetics , Craniofacial Abnormalities/genetics , Syndactyly/genetics , Toes/abnormalities , Abnormalities, Multiple/diagnostic imaging , Abnormalities, Multiple/pathology , Child , Craniofacial Abnormalities/pathology , Female , Fingers/abnormalities , Fingers/diagnostic imaging , Genes, Recessive , Hand , Humans , Phenotype , Radiography , Syndactyly/classification , Syndactyly/diagnostic imaging , Syndactyly/pathology , Syndrome , Toes/diagnostic imaging
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