scholarly journals Importance of Extraintestinal Manifestations in Early Diagnosis of Gardner Syndrome

2020 ◽  
Vol 2020 ◽  
pp. 1-4
Author(s):  
Bruno Besteiro ◽  
Filipa Gomes ◽  
Cláudia Costa ◽  
Raquel Portugal ◽  
Isabel Garrido ◽  
...  
Keyword(s):  
Autosomal Dominant ◽  
De Novo ◽  
Hypochromic Anemia ◽  
Extraintestinal Manifestations ◽  
Gastrointestinal Involvement ◽  
Gardner Syndrome ◽  
Clinical Challenge ◽  
Endoscopic Study ◽  
Dominant Disease ◽  
Etiological Study

Gardner’s syndrome is an autosomal dominant disease caused by a mutation in the APC gene with 20–30% of cases presenting de novo. This entity is a variant of familial adenomatous polyposis, with a prevalence of 3/100,000 habitants. It may present as early as 2 months of age with a variety of both colonic and extracolonic symptoms. We report a case of a 21-year-old man, without any known family history, presenting with microcytic hypochromic anemia and constitutional symptoms for two months. Ultimately, after the etiological study, Gardner syndrome diagnosis was established as an index primary familiar case. Gardner syndrome is a clinical challenge which requires a prompt suspicion in order to reach its diagnosis. Given the malignant evolution of adenomas in 100% of untreated patients, early identification of extraintestinal manifestations (identifiable prior to colonic symptoms) is of the essence. A consequent endoscopic study to confirm gastrointestinal involvement is essential for a more favorable prognosis.

scholarly journals A novel TSC1 variant associated with tuberous sclerosis and sacrococcygeal teratoma

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Saba Ahmad ◽  
Luis Manon ◽  
Gifty Bhat ◽  
Jerry Machado ◽  
Alice Zalan ◽  
...  
Keyword(s):  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Cellular Differentiation ◽  
Autosomal Dominant ◽  
De Novo ◽  
Autosomal Dominant Disease ◽  
Sacrococcygeal Teratoma ◽  
Dominant Disease ◽  
The Brain

AbstractTuberous sclerosis complex (TSC) is an autosomal dominant disease associated with tumors and malformed tissues in the brain and other vital organs. We report a novel de novo frameshift variant of the TSC1 gene (c.434dup;p. Ser146Valfs*8) in a child with TSC who initially presented with a sacral teratoma. This previously unreported association between TSC and teratoma has broad implications for the pathophysiology of embryonic tumors and mechanisms underlying cellular differentiation.

Townes–Brocks syndrome

2015 ◽  
Author(s):  
Udo Vester ◽  
Stefanie Weber
Keyword(s):  
Central Nervous System ◽  
Renal Failure ◽  
Renal Function ◽  
Autosomal Dominant ◽  
Renal Agenesis ◽  
De Novo ◽  
Renal Involvement ◽  
Renal Cysts ◽  
Variable Expression ◽  
Dominant Disease

Townes–Brocks syndrome (TBS) is an autosomal dominant disease with variable expression. Classical features are imperforate anus, dysplastic ears with congenital hearing deficit, and triphalangeal thumbs in most cases. A variety of other malformations (renal, genitourinary, heart, central nervous system, eyes) or hypothyroidism has been described. Mutations in SALL1 have been identified in patients with TBS and genetic testing allows confirmation of the diagnosis. Familiar and sporadic forms (caused by de novo mutations) seem to be equally distributed. Renal involvement in TBS is not uncommon and includes renal agenesis, hypo-/dysplasia, and renal cysts and may eventually lead to chronic renal failure. As renal function may not deteriorate before adulthood, renal function should be monitored in all patients. As cases with TBS can be oligosymptomatic, TBS should be suspected in every case with unexplained renal failure, minor abnormalities, or indicative family history. Genetic counselling is mandatory in identified cases.

Hyperinsulinism-hyperammonemia syndrome: a de novo mutation of the GLUD1 gene in twins and a review of the literature

2016 ◽  
Vol 29 (9) ◽  
Author(s):  
Dorotea Ninković ◽  
Vladimir Sarnavka ◽  
Anica Bašnec ◽  
Mario Ćuk ◽  
Danijela Petković Ramadža ◽  
...  
Keyword(s):  
Autosomal Dominant ◽  
De Novo ◽  
De Novo Mutation ◽  
Congenital Hyperinsulinism ◽  
Review Of The Literature ◽  
Plasma Ammonia ◽  
Activating Mutations ◽  
Dominant Disease ◽  
Recurrent Hypoglycemia ◽  
Rare Autosomal Dominant Disease

AbstractHyperinsulinism-hyperammonemia (HI/HA) syndrome is a rare autosomal dominant disease characterized by recurrent hypoglycemia and persistent mild elevation of plasma ammonia. HI/HA syndrome is one of the more common forms of congenital hyperinsulinism (CHI), caused by activating mutations within the

scholarly journals A family harboring an MLKL loss of function variant implicates impaired necroptosis in diabetes

2021 ◽  
Vol 12 (4) ◽  
Author(s):  
Joanne M. Hildebrand ◽  
Bernice Lo ◽  
Sara Tomei ◽  
Valentina Mattei ◽  
Samuel N. Young ◽  
...  
Keyword(s):  
Potential Role ◽  
Autosomal Dominant ◽  
Inflammatory Diseases ◽  
Diabetic Patients ◽  
Incomplete Penetrance ◽  
Loss Of Function ◽  
Healthy Sibling ◽  
Dominant Disease ◽  
Terminal Effector

AbstractMaturity-onset diabetes of the young, MODY, is an autosomal dominant disease with incomplete penetrance. In a family with multiple generations of diabetes and several early onset diabetic siblings, we found the previously reported P33T PDX1 damaging mutation. Interestingly, this substitution was also present in a healthy sibling. In contrast, a second very rare heterozygous damaging mutation in the necroptosis terminal effector, MLKL, was found exclusively in the diabetic family members. Aberrant cell death by necroptosis is a cause of inflammatory diseases and has been widely implicated in human pathologies, but has not yet been attributed functions in diabetes. Here, we report that the MLKL substitution observed in diabetic patients, G316D, results in diminished phosphorylation by its upstream activator, the RIPK3 kinase, and no capacity to reconstitute necroptosis in two distinct MLKL−/− human cell lines. This MLKL mutation may act as a modifier to the P33T PDX1 mutation, and points to a potential role of impairment of necroptosis in diabetes. Our findings highlight the importance of family studies in unraveling MODY’s incomplete penetrance, and provide further support for the involvement of dysregulated necroptosis in human disease.

scholarly journals Effective variant filtering and expected candidate variant yield in studies of rare human disease

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Brent S. Pedersen ◽  
Joe M. Brown ◽  
Harriet Dashnow ◽  
Amelia D. Wallace ◽  
Matt Velinder ◽  
...  
Keyword(s):  
Whole Genome Sequencing ◽  
Rare Disease ◽  
Genome Sequencing ◽  
Autosomal Dominant ◽  
De Novo ◽  
Autosomal Dominant Inheritance ◽  
Compound Heterozygous ◽  
Whole Genome ◽  
Dominant Inheritance ◽  
Family Based

AbstractIn studies of families with rare disease, it is common to screen for de novo mutations, as well as recessive or dominant variants that explain the phenotype. However, the filtering strategies and software used to prioritize high-confidence variants vary from study to study. In an effort to establish recommendations for rare disease research, we explore effective guidelines for variant (SNP and INDEL) filtering and report the expected number of candidates for de novo dominant, recessive, and autosomal dominant modes of inheritance. We derived these guidelines using two large family-based cohorts that underwent whole-genome sequencing, as well as two family cohorts with whole-exome sequencing. The filters are applied to common attributes, including genotype-quality, sequencing depth, allele balance, and population allele frequency. The resulting guidelines yield ~10 candidate SNP and INDEL variants per exome, and 18 per genome for recessive and de novo dominant modes of inheritance, with substantially more candidates for autosomal dominant inheritance. For family-based, whole-genome sequencing studies, this number includes an average of three de novo, ten compound heterozygous, one autosomal recessive, four X-linked variants, and roughly 100 candidate variants following autosomal dominant inheritance. The slivar software we developed to establish and rapidly apply these filters to VCF files is available at https://github.com/brentp/slivar under an MIT license, and includes documentation and recommendations for best practices for rare disease analysis.

Sa1696 - Vedolizumab Induces De Novo Extraintestinal Manifestations in Patients with Inflammatory Bowel Disease

2018 ◽  
Vol 154 (6) ◽  
pp. S-360 ◽  
Author(s):  
Su Bin Kim ◽  
Liege I. Diaz ◽  
Fernando Calmet ◽  
Maria A. Quintero ◽  
Ingrid Schwartz ◽  
...  
Keyword(s):  
Inflammatory Bowel Disease ◽  
Bowel Disease ◽  
De Novo ◽  
Extraintestinal Manifestations ◽  
Inflammatory Bowel

Impaired social cognition and fine dexterity in patients with Cowden syndrome associated with germline PTEN variants

2021 ◽  
pp. jmedgenet-2021-107954
Author(s):  
Clément Desjardins ◽  
Frédéric Caux ◽  
Bertrand Degos ◽  
Djallel Benzohra ◽  
Astrid De Liège ◽  
...  
Keyword(s):  
Social Cognition ◽  
Neuropsychological Assessment ◽  
Splice Site ◽  
Autosomal Dominant ◽  
Neuropsychological Functioning ◽  
Cowden Syndrome ◽  
Increased Risk ◽  
Cerebral Mri ◽  
Dominant Disease ◽  
Brain Alteration

PurposeCowden syndrome (CS) is an autosomal dominant disease related to germline PTEN variants and is characterised by multiple hamartomas, increased risk of cancers and frequent brain alteration. Since the behaviour of patients with CS sometimes appears to be inappropriate, we analysed their neuropsychological functioning.MethodsThis monocentric study was conducted between July 2018 and February 2020. A standardised neuropsychological assessment, including an evaluation of social cognition, executive functions, language and dexterity, as well as a cerebral MRI were systematically proposed to all patients with CS. Moreover, PTEN variants were identified.ResultsFifteen patients from 13 families were included, with six non-sense (40%), three missense (20%), five frameshift (33.3%) and one splice site (6.6%) variant types. Twelve patients (80%) had altered social cognition: 10 patients had an abnormal modified Faux-Pas score and 5 had Ekman’s facial emotions recognition impairment. Nearly all patients (93%) had impaired dexterity. Cerebral MRI showed various cerebellar anomalies in seven patients (46.7%).ConclusionAltered social cognition and impaired fine dexterity are frequently associated with CS. Further studies are needed to confirm these results and to determine whether dexterity impairment is due to the effect of germline PTEN variants in the cerebellum.

scholarly journals Long-term follow-up until early adulthood in autosomal dominant, complex SPG30 with a novel KIF1A variant: a case report

2019 ◽  
Vol 45 (1) ◽  
Author(s):  
Carlotta Spagnoli ◽  
Susanna Rizzi ◽  
Grazia Gabriella Salerno ◽  
Daniele Frattini ◽  
Carlo Fusco
Keyword(s):  
Autosomal Dominant ◽  
De Novo ◽  
Current Knowledge ◽  
Brain Mri ◽  
Early Adulthood ◽  
Cerebellar Atrophy ◽  
Mild Intellectual Disability ◽  
Long Term Follow Up

Abstract Background Pathogenic variants in KIF1A (kinesin family member 1A) gene have been associated with hereditary spastic paraplegia (HSP) type 30 (SPG30), encopassing autosomal dominant and recessive, pure and complicated forms. Case presentation We report the long-term follow-up of a 19 years-old boy first evaluated at 18 months of age because of toe walking and unstable gait with frequent falls. He developed speech delay, mild intellectual disability, a slowly progressive pyramidal syndrome, microcephaly, bilateral optic subatrophy and a sensory axonal polyneuropathy. Brain MRI showed cerebellar atrophy, stable along serial evaluations (last performed at 18 years of age). Targeted NGS sequencing disclosed the de novo c.914C > T missense, likely pathogenic variant on KIF1A gene. Conclusions We report on a previously unpublished de novo heterozygous likely pathogenic KIF1A variant associated with slowly progressive complicated SPG30 and stable cerebellar atrophy on long-term follow-up, adding to current knowledge on this HSP subtype.

scholarly journals Clinical case of myocardial infarction with unspecified familial hypercholesterolemia

2022 ◽  
Vol 17 (4) ◽  
pp. 74-78
Author(s):  
N. G. Lozhkina ◽  
A. N. Spiridonov
Keyword(s):  
Myocardial Infarction ◽  
Familial Hypercholesterolemia ◽  
Clinical Case ◽  
Autosomal Dominant ◽  
Clinical Symptoms ◽  
Cholesterol Metabolism ◽  
Single Gene ◽  
Low Density Lipoproteins ◽  
Dominant Disease ◽  
Appropriate Therapy

Familial hypercholesterolemia is a hereditary autosomal dominant disease characterized by a violation of cholesterol metabolism. This nosology was first described in the late 1930s by the Norwegian clinician Karl Moeller, he proposed the idea that hypercholesterolemia and tendon xanthomas are associated with cardiovascular diseases through the inheritance of a single gene. In 1964, two clinical phenotypes of familial hypercholesterolemia were discovered: heterozygous and homozygous, associated with an unfavorable prognosis. To date, it is known that the long-running process of accumulation of low-density lipoproteins in the intima of blood vessels may not have clinical symptoms for many years due to the developed system of collaterals and the absence of hemodynamically significant stenosis. However, without timely diagnosis and appropriate therapy, this condition inevitably leads to the development of a cardiovascular event. The article presents a clinical case demonstrating the development of myocardial infarction in a patient with a late diagnosis of this disease.

DLX3 Mutation in a New Family and Its Phenotypic Variations

2008 ◽  
Vol 87 (4) ◽  
pp. 354-357 ◽  
Author(s):  
S.-K. Lee ◽  
Z.H. Lee ◽  
S.-J. Lee ◽  
B.-D. Ahn ◽  
Y.-J. Kim ◽  
...  
Keyword(s):  
Gene Mutation ◽  
Autosomal Dominant ◽  
Mutational Analysis ◽  
Enamel Hypoplasia ◽  
Enamel Defects ◽  
Clinical Phenotypes ◽  
New Family ◽  
Dominant Disease ◽  
Curly Hair ◽  
Phenotypic Variations

Tricho-dento-osseous syndrome (TDO) is an autosomal-dominant disease characterized by curly hair at birth, enamel hypoplasia, taurodontism, and a thick cortical bone. A common DLX3 gene mutation (c.571_574delGGGG) has been identified in multiple families with variable clinical phenotypes. Recently, another DLX3 gene mutation (c.561_562delCT) was reported to cause amelogenesis imperfecta with taurodontism (AIHHT). We identified a Korean family with overlapping phenotypes of TDO and AIHHT. We performed mutational analysis to discover its genetic etiology. The identified mutation was c.561_562delCT mutation in the DLX3 gene. The enamel was hypomature and hypoplastic. The characteristic taurodontic features were not identified. Increased bone density or thickness could not be revealed by cephalometric, hand-wrist, and panoramic radiographs. Affected individuals reported that their nails were brittle, and they had curly hair at birth. This study clearly showed that the c.561_562delCT mutation had not only enamel defects, but also other clinical phenotypes resembling those of TDO syndrome.

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