Clinical and genetic analysis of a patient with Loeys-Dietz syndrome due to variant of TGFBR2 gene / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis of a patient with clinically suspected Loeys-Dietz syndrome (LDS).@*METHODS@#A child who had presented at Beijing Anzhen Hospital in September 2018 was selected as the study subject. Clinical data and family history of the patient were collected, along with peripheral blood samples of the proband and his parents. Whole exome sequencing (WES) was carried out through next-generation sequencing.@*RESULTS@#Candidate variants were searched through bioinformatic analysis focusing on genes associated with hereditary aortic aneurysms. Candidate variant was verified by Sanger sequencing. The patient was found to have cardiovascular abnormalities including early-onset aortic dilatation and coarctation, and LDS syndrome was suspected. WES revealed that he has harbored a heterozygous c.1526G>T missense variant of the TGFBR2 gene. The same variant was not found in either parent and was predicted as likely pathogenic (PM1+PM2_Supporting+ PM6+PP3+PP4) based on the guidelines from the American College for Medical Genetics and Genomics (ACMG).@*CONCLUSION@#The TGFBR2 c.1526G>T variant probably underlay the LDS in this patient and was unreported previously in China. Above finding has enriched the mutational spectrum of the TGFBR2 gene associated with the LDS and provided a basis for the genetic counseling for the patient.

Clinical and genetic characteristics of 12 cases of Loeys-Dietz syndrome / 中华医学遗传学杂志

OBJECTIVE@#To summarize the clinical features and spectrum of genetic variants in 12 patients with Loeys-Dietz syndrome (LDS), and to explore the correlation between the type of genetic variants and clinical phenotypes.@*METHODS@#Twelve patients suspected for LDS at Beijing Anzhen Hospital Affiliated to Capital Medical University from January 2015 to January 2022 were selected as the study subjects. Clinical data of the patients were collected. Genomic DNA was extracted from peripheral blood samples and subjected to genetic testing. Pathogenicity of candidate variants was analyzed.@*RESULTS@#The clinical phenotypes of the 12 patients have mainly included cardiovascular, musculoskeletal, craniofacial, skin, ocular and other systemic signs. Four patients (patients 5-1, 5-2, 6, 7) have carried heterozygous missense variants of the TGFBR1 gene, 5 patients (patients 1-1, 1-2, 2, 3, 4) have carried heterozygous variants of the TGFBR2 gene, and 2 patients (patients 8-1, 8-2) had carried heterozygous frameshift variants of the TGFB3 gene. One patient (patient 9) had carried a heterozygous missense variant of the SMAD3 gene. Among these, TGFBR1 c.603T>G (p.1201M) and TGFB3 c.536delA (p.H179FS35) had not been reported previously.@*CONCLUSION@#Variants of the TGFBR1, TGFBR2, SMAD3, TGFB2, TGFB3 and SMAD2 genes are mainly associated with LDS. The severity of the disease phenotype caused by the same variant may vary, whilst the clinical phenotype caused by different variant sites may be specific.

Echocardiographic manifestation and analysis of TGFBR1 gene variant in a Chinese patient with Loeys-Dietz syndrome / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis for a patient with aortic root aneurysm and valve insufficiency.@*METHODS@#The patient was subjected to whole exome sequencing (WES) with a focus on the analysis of genes related to aortic aneurysm and other genetic diseases involving the cardiovascular system. Suspected pathogenic site was validated by Sanger sequencing of the patient and his family members.@*RESULTS@#WES has revealed a heterozygous c.830T>C variant (NM_001130916.3) in the patient, which was not detected among healthy members of his family. SIFT, PolyPhen2 and Mutation Taster predicted the variant to be disease causing, resulting in destruction of the structure and function of the TGFBR1 protein. Based on the American College of Medical Genetics and Genomics (ACMG) guidelines, the variant was predicted to be likely pathogenic (PM1+PM2+PM6+PP3+PP4).@*CONCLUSION@#The c.830T>C variant of the TGFBR1 gene probably underlay the disease in the proband. Above finding has enriched the spectrum of TGFBR1 gene variants in Chinese population.

Novel Association of a Familial TGFBR1 Mutation in Loeys-Dietz Syndrome with Concomitant Hematologic Malignancy / 대한흉부외과학회지

Concomitant Loeys-Dietz syndrome (LDS) and hematologic malignancies are exceptionally rare. This is the first report of a patient operated on for aortic root dilation who had been previously diagnosed with LDS and B-cell-lymphoma. After completion of chemotherapy and complete remission, an elective valve-sparing aortic root replacement (using the David-V method) was performed. Due to the positive family history, pre-operative genetic counseling was conducted, and revealed LDS with a TGFBR1 (transforming growth factor beta receptor type I) mutation in 6 probands of the family, albeit in 1 of them posthumously. This missense mutation has been previously described in relation to aortic dissection, but a causative relationship to malignancy has so far neither been proposed nor proven.

Arterial Tortuosity Syndrome in a Neonate

Arterial tortuosity syndrome (ATS) is a very rare autosomal recessive connective tissue disease characterized by generalized elongation and tortuosity of the medium- to large-sized arteries, and other systemic connective tissue manifestations. To date, this disease entity has not been reported in Korea. We report a case of ATS diagnosed in a neonate who presented with severe elongation and tortuosity of the aorta and its major branches, as well as the intracranial arteries. Additionally, the patient presented with a tortuous dilatation of the inferior vena cava, an aneurysmal dilatation of the extra-hepatic bile ducts, and an inguinal and sliding hiatal hernia. The diagnosis was confirmed using DNA sequencing analysis, and the patient demonstrated a compound heterozygosity for two novel mutations (c.738delG [p.Gln247Serfs*33] and c.362T>C [p.Ile121Thr]) in exon 2 of the SLC2A10 gene. Genetic analysis also confirmed that both parents were heterozygous carriers of the responsible mutations. Owing to such clinical manifestations, ATS is often misdiagnosed as other connective tissue diseases including Loeys-Dietz syndrome, Marfan syndrome, and Ehlers-Danlos syndrome. In patients presenting with a high index of suspicion, thorough clinical evaluation and screening for ATS including computed tomography or magnetic resonance angiography and target gene analysis are necessary for early diagnosis and management.

Síndrome de Loeys-Dietz, 3 generaciones, 4 casos familiares / Loeys-Dietz Syndrome, 3 generations, 4 familial cases

El síndrome de Loeys-Dietz es una enfermedad genética autosómica dominante caracterizada por aneurismas aórticos, tortuosidad arterial generalizada, hipertelorismo y úvula bifida o paladar hendido. La complicación cardiovascular más grave es la disección aórtica. Se presentan cuatro casos familiares de este síndrome en tres generaciones, todos con dilatación aórtica grave, y se describen sus aspectos diagnósticos, indicación y tratamiento quirúrgico, como así también pautas de seguimiento.

Loeys-Dietz Syndrome is an autosomal dominant disease with aortic aneurysms, arterial tortuosity with hypertelorism and bifid uvula. We describe four familial cases within three generations. The diagnosis, surgical management and followup will be addressed.

Aneurismas da Aorta Torácica: Avaliação Genética e de Imagem para Cirurgias Eletivas / Thoracic Aortic Aneurysm: Genetic and Image Evaluation for Elective Surgeries

Evidências mostram que variações genéticas de um único gene, denominadas “mutações genéticas”, predispõem indivíduos aos aneurismas e dissecções da aorta e seus ramos. Com a identificação dessas mutações, diretrizes sugerem o manuseio no diagnóstico, o momento ideal para a correção cirúrgica e a identificação de indivíduos sob alto risco de ruptura ou dissecção e suas respectivas famílias. Essas mutações podem se apresentar de forma “sindrômica”, com identificação fenotípica simples ou apresentação “familiar”. Nos indivíduos sem características fenotípicas, a ocorrência familiar da mutação genética deve ser investigada através da história familiar, exames de imagem e através de marcadores genéticos.

Evidence shows that genetic variations in a single gene called gene mutations predispose individuals to aneurysms and dissections of the aorta and its branches. With the identification of these mutations, guidelines suggest that diagnosis management is the idealtime for surgical correction and the identification of individuals at high risk of rupture or dissection and their families. These mutations may be present in a syndromic way with simple phenotypic identification or family presentation. In individuals without phenotypic characteristics, familial occurrence of genetic mutation should be investigated through the family history, imaging scansand through genetic markers.

Periodic Surveillance and Medical Management of Thoracic Aortic Aneurysm / 대한내과학회지

Thoracic aortic enlargement is a silent, but deadly, disease that is often diagnosed on imaging studies performed for unrelated indications and result in life threatening event such as aortic rupture and dissection. The etiologies underlying thoracic aortic enlargement are diverse and can range from degenerative or hypertensive aortic enlargement to more rare genetic disorders including Marfan syndrome and Loeys-Dietz syndrome. Therefore, the diagnosis and management of this disease can be complex. This review focuses on the periodic surveillance using imaging modality before surgical intervention and medical management of asymptomatic patients with thoracic aortic aneurysm.

Valve Sparing Aortic Root Replacement in Children with Loeys-Dietz Syndrome

Loeys-Dietz syndrome (LDS) is an autosomal dominant connective tissue disorder that is characterized by aggressive arterial and aortic disease, often involving the formation of aortic aneurysms. We describe the cases of two children with LDS who were diagnosed with aortic root aneurysms and successfully treated by valve-sparing aortic root replacement (VSRR) with a Valsalva graft. VSRR is a safe and suitable operation for children that avoids prosthetic valve replacement.

Multiple Aortic Operations in Loeys-Dietz Syndrome: Report of 2 Cases

Due to its low prevalence and because there is lack of awareness about it, Loeys-Dietz syndrome is often mis-diagnosed as Marfan syndrome, which has similar skeletal abnormalities and aortic pathology. However, the differential diagnosis between these two connective tissue diseases is critical because they correspond to different surgical indications and surgical decision-making. We report two cases of successful thoracoabdominal aortic replacement in patients with previously undiagnosed Loeys-Dietz syndrome.

Aneurismas de aorta abdominal e ilíaca y síndrome de Loeys- Dietz / Abdominal aortic iliac aneurysms and Loeys-Dietz syndrome

Se presenta el caso clínico de una paciente de 29 años de edad, con antecedentes de ectasia aórtica, quien había sido estudiada a los 18 años mediante cineangiografía y se halló un aneurisma fusiforme de la aorta abdominal infrarrenal y de la arteria ilíaca primitiva izquierda, de causa no precisada, las cuales fueron sustituidas con derivación aortofemoral izquierda. Posteriormente, en el 2012, presentó dolor y aumento del volumen en la región inguinal izquierda, por lo que fue atendida en el Cuerpo de Guardia del Hospital Provincial Docente Clinicoquirúrgico "Saturnino Lora Torres" de Santiago de Cuba, y evaluada por especialistas del Servicio de Angiología y Cirugía Vascular, los cuales determinaron operarle de urgencia, al observar un aneurisma anastomótico de la arteria femoral izquierda, de causa micótica, y las características: craneosinostosis, úvula bífida y hendidura del paladar; propias del síndrome de Loeys-Dietz.

The case report of a 29 year-old patient, with a history of aortic ectasia who had been studied when she was 18 years through cineangiography is presented and a fusiform aneurysm of the infrarrenal abdominal aorta and of the left primitive iliac artery, of unspecific cause was found, which were substituted with left aortofemoral bypass. Later on, in 2012, she presented pain and increase of the volume in the left inguinal region, reason why she was assisted in the emergency room of "Saturnino Lora Torres" Teaching Provincial Clinical Surgical Hospital in Santiago de Cuba, and evaluated by specialists of the Angiology and Vascular Surgery Service, which determined to treat her with an emergency surgery, when observing an anastomotic aneurysm of the left femoral artery of fungal cause, and the characteristics: craneosinostosis, bifid uvula and cleft palate; characteristic of Loeys Dietz syndrome.

Neurovascular Manifestation of Loeys-Dietz Syndrome: A Case Report

Loeys-Dietz syndrome (LDS) is an autosomal dominant disorder caused by heterozygous mutations in the genes encoding transforming growth factor-beta receptor type 1 or 2. It is typically characterized by a triad of hypertelorism, cleft palate or bifid uvula, and arterial tortuosity with aneurysm or dissection. Characteristic vascular abnormalities such as tortuosity, aneurysms, dissections, and stenosis are the most severe complications of LDS and can occur in the neurovascular system. We report a 5-year-old boy who presented with headaches and neurovascular abnormalities and was diagnosed with LDS with a novel mutation of the TGFBR1 gene. It is the first Korean report of neurovascular abnormalities in LDS.

A Case of Near Total Aortic Replacement in an Adolescent With Loeys-Dietz Syndrome

Loeys-Dietz syndrome is a recently described autosomal dominant disorder caused by mutations in the genes for transforming growth factor-beta receptor type 1 or 2 (TGF-ssR 1/2). The syndrome predisposes patients to aortic aneurysm and dissections, along with craniofacial and musculoskeletal abnormalities. Here we report the case of an adolescent who underwent serial near total aortic replacement, from the aortic valve to the descending aorta. Loeys-Dietz syndrome was confirmed in this case by the detection of a mutation in the TGF-ssR 2 gene.

A sporadic case of Loeys-Dietz syndrome type I with two novel mutations of the TGFBR2 gene / 소아과

A recently recognized connective tissue disorder, Loeys-Dietz syndrome (LDS) is a genetic aortic aneurysm syndrome caused by mutations in the transforming growth factor-receptor type I or II gene (TGFBR1 or TGFBR2). They have distinctive phenotypic abnormalities including widely spaced eyes (hypertelorism), bifid uvula or cleft palate, and arterial tortuosity with aortic aneurysm or dissection throughout the arterial tree. LDS is characterized by aggressive and rapid progression of aortic aneurysm. Therefore, the patients with distinct phenotype, marked aortic dilatation and aneurysm at early age should be suspected to be affected by LDS and rapid TGFBR gene analysis should be done. We report one child diagnosed as LDS due to typical phenotypes and two novel missense mutations of the TGFBR2 gene (c.1526G>T and c.1528A>T).

Anesthetic managements for correction of aortic valve regurgitation in a patient with Loeys-Dietz Syndrome: A case report / 대한마취과학회지

Loeys-Dietz Syndrome (LDS) is a recently described autosomal dominant aortic aneurysm syndrome with widespread systemic involvement. It is characterized by the triad of 1) arterial tortuosity and aneurysms, 2) hypertelorism, and 3) bifid uvula or cleft palate. A 12-year-old boy with LDS was scheduled to undergo correction of aortic valve regurgitation due to aortic annuloectasia. We report our clinical experiences of a case of LDS patient with brief review of related literatures and relevant anesthetic problems.

Ascending Aortic Rupture in a Young Woman with Loeys-Dietz Syndrome: The First Case Report in Korea / 대한흉부외과학회지

Characterized by unique phenotypic features such as aortic aneurysm/dissection, hypertelorism, bifid uvula/cleft palate and generalized tortuosity in the arterial system, Loeys-Dietz syndrome is a newly described aggressive connective tissue disorder associated with mutation in the gene encoding transforming growth factor-beta receptor type I or type II. Some phenotypic manifestations of Loeys-Dietz syndrome overlap with those of Marfan syndrome or Ehlers-Danlos syndrome type IV. However, due to its more malignant pathophysiologic nature, physicians should be alert to Loeys-Dietz syndrome. High suspicion, early diagnosis, preventive surgery and serial imaging assessments are warranted for optimal management of Loeys-Dietz syndrome. We present here a case of a young patient with Loeys-Dietz syndrome who had aortic rupture, bifid uvula and hypertelorism. We also present a review of the medical literature.