scholarly journals A novel homozygous variant of COL2A1 in a Chinese male with type II collagenopathy: a case report

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Qianwen Zhang ◽  
Ruen Yao ◽  
Qun Li ◽  
Xin Li ◽  
Biyun Feng ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Autosomal Recessive Inheritance ◽  
Missense Variant ◽  
Type Ii ◽  
Molecular Defects ◽  
Homozygous Variant ◽  
First Case ◽  
Dominant Disease ◽  
Epiphyseal Dysplasia ◽  
Chinese Male

Abstract Background Type II collagenopathies are a spectrum of diseases and skeletal dysplasia is one of the prominent features of collagenopathies. Molecular defects of the COL2A1 gene cause type II collagenopathies that is mainly an autosomal dominant disease, whereas some rare cases with autosomal recessive inheritance of mode have also been identified. Case presentation The patient was a 5-year-old male with a short neck, flat face, epiphyseal dysplasia, irregular vertebral endplates, and osteochondritis. Sequencing result indicated NM_001844.4: c.3662C > T; p. (Ser1221Phe) a novel missense variant, leading to a serine-to-phenylalanine substitution. Sanger sequencing confirmed the variant compared to his parents and brother. Conclusions We identified a novel homozygous variant of the COL2A1 gene as the cause of type II collagenopathies in a Chinese male, enriching the spectrum of genotypes. This is the first case of type II collagenopathies inherited in an autosomal recessive manner in China and East Asia, and it is the first case that resulted from serine substitution in the world.

scholarly journals Hypoplasia of ribs associated with cleft palate, cleft lip, and unilateral renal agenesis in a neonate dog of undefined breed

2019 ◽  
Vol 40 (1) ◽  
pp. 497
Author(s):  
Keylla Helena Nobre Pacifico Pereira ◽  
Caio Henrique Paganini Burini ◽  
Elton Luís Ritir Oliveira ◽  
Lucas Emanuel Ferreira Canuto ◽  
Luiz Eduardo Cruz Dos Santos Correia ◽  
...  
Keyword(s):  
Cleft Palate ◽  
Autosomal Recessive ◽  
Cleft Lip ◽  
Renal Agenesis ◽  
Present Report ◽  
Autosomal Recessive Inheritance ◽  
Normal Function ◽  
Congenital Defects ◽  
Unilateral Renal Agenesis ◽  
First Case

Congenital defects can cause changes in the normal function or morphology of organs, thus contributing to neonatal mortality. Malformations in dogs occur as a result of genetic factors or by the action of teratogenic agents during pregnancy. Genetic defects can be inherited from one or both parents. These defects are more common in purebred puppies or can even be the result of consanguinity. Teratogenic agents, such as toxins, drugs, infectious diseases, mechanical influences, and irradiation, may affect the litters during gestational development. Hypoplasia of ribs has been described in human newborns. It is a rare and lethal malformation of autosomal recessive inheritance that prevents thoracic expansion and reduces pulmonary compliance, causing respiratory failure. A pregnant bitch of undefined breed was submitted to caesarean section. At birth, a neonate exhibited respiratory distress, and the palpation of the thorax indicated absence of ribs. In addition, the newborn had cleft palate and cleft lip, which led to perform the euthanasia of the animal. Post-mortem examination indicated hypoplasia of ribs and unilateral renal agenesis. As in the canine neonate, hypoplasia of ribs in human newborns is also associated with other malformations, such as cleft lip, cleft palate, and urogenital defects. The present report describes the first case of hypoplasia of ribs associated with other malformations in a canine neonate, the cause being possibly related to a genetic hereditary factor.

scholarly journals A novel nonsense mutation c.1121G>A (p.Trp374*) in the CLIC5 gene is the main cause of the juvenile autosomal recessive form of deafness (DFNB103) in the Arctic regions of Yakutia

2019 ◽  
pp. 36-48
Author(s):  
В.Г. Пшенникова ◽  
Г.П. Романов ◽  
Т.М. Николаева ◽  
Ф.М. Терютин ◽  
Т.В. Борисова ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Autosomal Recessive ◽  
Disease Onset ◽  
Premature Stop Codon ◽  
The Arctic ◽  
Gjb2 Gene ◽  
Unknown Etiology ◽  
Homozygous Mutation ◽  
Homozygous Variant ◽  
First Case

Наиболее частой причиной несиндромальной потери слуха являются мутации гена GJB2. Ранее было показано, что в Якутии вклад мутаций гена GJB2 в потерю слуха среди пациентов с врожденной тугоухостью составил 49%. Целью данной работы являлся поиск молекулярно-генетических основ потери слуха среди GJB2-негативных пациентов, у которых причина заболевания осталась неустановленной. В исследование были включены 238 (228 неродственных) GJB2-негативных пациентов, среди которых мы обнаружили одну семью с 5 пораженными индивидами с ювенильной потерей слуха неизвестной этиологии (дебют заболевания варьировал от 0 до 8 лет). Путём полноэкзомного анализа (WES), проведенного у одного из пораженных членов семьи, была выявлена ранее не описанная гомозиготная замена c.1121G>A в 6-ом экзоне гена CLIC5 (6p21.1, OMIM 607293). Данная транзиция приводит к образованию преждевременного стоп-кодона в 374-ой аминокислотной позиции (p.Trp374*), терминирующего синтез полипептидной цепи белка CLIC5 (NP_001107558.1). В гене CLIC5 известна только одна гомозиготная замена c.96T>A (р.Cys32*), которая ранее была найдена в инбредной турецкой семье с постлингвальной прогрессирующей аутосомно-рецессивной глухотой (DFNB103). В настоящей работе гомозиготный вариант c.1121G>A (p.Trp374*) был выявлен у 26 из 238 GJB2-негативных пациентов (10,9%). У большинства из них (19 из 26) отмечается поздний дебют потери слуха в среднем в 9,7±0,6 лет. Аудиологическое обследование у 13 из 26 пациентов выявило преимущественно симметричную сенсоневральную прогрессирующую потерю слуха различной степени тяжести (от донозологической и I-ой степени тугоухости до глухоты). Распространенность DFNB103, обусловленной гомозиготным вариантом c.1121G>A (p.Trp374*) гена CLIC5, в Якутии составила в среднем 0,27±0,05 на 10000 человек с максимальным накоплением в Эвено-Бытантайском национальном районе (31,39±10,46 на 10000 человек), который относится к арктической группе улусов, где большинство населения составляют эвены (53%). Это первый в России случай идентификации орфанного заболевания, накопление которого обнаружено в Арктике. В целом, гомозиготный вариант c.1121G>A (p.Trp374*) гена CLIC5 можно расценивать как каузативный для DFNB103 с высоким вкладом в этиологию нарушений слуха у населения Якутии. The most common cause of non-syndromic hearing loss in various populations of the world is the mutations in the GJB2 gene. Previously it was shown that the pathogenic contribution of the GJB2-mutations among patients with congenital hearing loss in Yakutia was 49%. The aim of this work was to investigate the molecular genetic basis of hearing loss among GJB2-negative patients. The study included 238 (228 unrelated) GJB2-negative patients, among them we found one family with five affected individuals with juvenile hearing loss of unknown etiology (the disease onset varied from 0 to 8 years). Using a whole exome sequencing (WES), performed in one of affected family members, a novel homozygous c.1121G>A (6p21.1, OMIM 607293) substitution in exon 6 of the CLIC5 gene was detected. This substitution leads to the formation of a premature stop codon at the 374 amino acid position (p.Trp374*) which terminates the synthesis of the polypeptide chain of the CLIC5 protein (NP_001107558.1). To date, only one homozygous mutation c.96T>A (p.Cys32*) was known in human gene CLIC5 which was found in one inbred Turkish family with progressive autosomal recessive deafness, type 103 (DFNB103). In our study, a homozygous variant c.1121G>A (p.Trp374*) was detected in 26 out of 238 GJB2-negative patients in Yakutia (10.9%). Most of homozygous for c.1121G>A patients (19 out of 26) reported about late onset of their hearing loss occurred in postlingual period (averaged 9.7±0.6 years). Audiological examination of 13 out of 26 patients revealed predominantly symmetric sensorineural progressive hearing loss of varying severity (from mild to profound hearing loss). The average prevalence of DFNB103 caused by the homozygous variant c.1121G>A (p.Trp374*) in Yakutia was 0.27±0.053 per 10000 with a maximum accumulation in Eveno-Bytantaysky district (31.39±10.46 per 10000) which referred to the Arctic group of districts where the majority of the population is represented by Evens (53%). This is the first case of the identification of the orphan disease with its accumulation in Arctic part of Russia. In general, the homozygous variant c.1121G>A (p.Trp374*) of the CLIC5 gene can be regarded as causative to DFNB103 with a high contribution to the etiology of hearing impairments in the population of Yakutia.

scholarly journals Genetic analysis of osteopetrosis in Pakistani families identifies novel and known sequence variants

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Chunyu Liu ◽  
Muhammad Ajmal ◽  
Zaineb Akram ◽  
Tariq Ghafoor ◽  
Muhammad Farhan ◽  
...  
Keyword(s):  
Molecular Diagnosis ◽  
Autosomal Recessive ◽  
Autosomal Recessive Inheritance ◽  
Missense Variant ◽  
Whole Exome ◽  
Novel Variants ◽  
Malignant Osteopetrosis ◽  
The Stability ◽  
Pakistani Families ◽  
Infantile Malignant Osteopetrosis

AbstractOsteopetrosis is a genetically heterogenous, fatal bone disorder characterized by increased bone density. Globally, various genetic causes are reported for osteopetrosis with all forms of inheritance patterns. A precise molecular diagnosis is necessary for prognosis and for prescribing treatment paradigms in osteopetrosis. Here we report on thirteen individuals diagnosed with infantile malignant osteopetrosis coming from ten unrelated Pakistani families; nine of whom are consanguineous. We performed whole exome sequencing and Sanger sequencing in all families and identified homozygous variants in genes previously reported for autosomal recessive inheritance of osteopetrosis. All the identified variants are expected to affect the stability or length of gene products except one nonsynonymous missense variant. TCIRG1 was found as a candidate causal gene in majority of the families. We report six novel variants; four in TCIRG1 and one each in CLCN7 and OSTM1. Our combined findings will be helpful in molecular diagnosis and genetic counselling of patients with osteopetrosis particularly in populations with high consanguinity.

scholarly journals Pregnancy and delivery in patients with hepatolenticular degeneration

2003 ◽  
Vol 52 (4) ◽  
pp. 68-71
Author(s):  
V. G. Vakharlovsky ◽  
F. K. Lagkueva ◽  
S. O. Kusova ◽  
T. I. Tzidaeva
Keyword(s):  
Autosomal Recessive ◽  
Clinical Symptoms ◽  
Specific Treatment ◽  
Autosomal Recessive Inheritance ◽  
Teratogenic Effect ◽  
Hepatolenticular Degeneration ◽  
Disease Exacerbation ◽  
Successful Pregnancy ◽  
First Case ◽  
Pregnancy And Delivery

Data of pregnancy course and delivery in 3 patients with hepatolenticular degeneration (GLD) a rare disease of autosomal recessive inheritance pattern are presented. In one case GLD was diagnosed prior pregnancy and treatment with cuprenil was continued during pregnancy. No progressive GLD clinical symptoms were observed. However pregnancy and delivery appeared to provoke GLD typical manifestations in other two patients. They have not got specific treatment with cuprenil during pregnancy as disease was diagnosed only after delivery. Deliveries in patients with GLD were successful and the newborns were healthy. No evidence of cuprenil teratogenic effect on fetus was revealed in the first case. This GLD is not contraindication for successful pregnancy but it is necessary to use cuprenil for prevention of disease exacerbation.

Pelizaeus Merzbacher phenotype with epilepsy and autosomal recessive inheritance in two siblings

2006 ◽  
Vol 37 (03) ◽  
Author(s):  
U Gaiser ◽  
J Neuberger ◽  
E Regel ◽  
R Emmert ◽  
M Ries
Keyword(s):  
Autosomal Recessive ◽  
Autosomal Recessive Inheritance ◽  
Recessive Inheritance

TYPICAL CASES OF ISOLATED GROWTH HORMONE DEFICIENCY WITH AUTOSOMAL RECESSIVE INHERITANCE

1970 ◽  
Vol 63 (4) ◽  
pp. 618-624 ◽  
Author(s):  
Y. Kumahara ◽  
Y. Okada ◽  
K. Miyai ◽  
H. Iwatsubo
Keyword(s):  
Growth Hormone ◽  
Growth Hormone Deficiency ◽  
Autosomal Recessive ◽  
Autosomal Recessive Inheritance ◽  
Adult Subject ◽  
Hormone Deficiency ◽  
Recessive Inheritance ◽  
Arginine Infusion ◽  
Isolated Growth Hormone Deficiency ◽  
Male Dwarf

ABSTRACT A 25-year-old male dwarf and his sister, a 31-year-old woman were investigated. Their respective heights were 114 and 97 cm with proportional statures. Their bone ages were that found in the adult subject. Thyroid functions and metyrapone test were normal and the total urinary gonadotrophin was determined in both cases. HGH secretion was not stimulated by insulin-induced hypoglycaemia, arginine infusion or exercise. Their parents and six other siblings were normal in height. The two patients were therefore assumed to be suffering from an isolated growth hormone deficiency with autosomal recessive inheritance.

scholarly journals Classical Xanthinuria in Nine Israeli Families and Two Isolated Cases from Germany: Molecular, Biochemical and Population Genetics Aspects

Biomedicines ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 788
Author(s):  
Hava Peretz ◽  
Ayala Lagziel ◽  
Florian Bittner ◽  
Mustafa Kabha ◽  
Meirav Shtauber-Naamati ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Heterologous Protein ◽  
Heterologous Protein Expression ◽  
Type I ◽  
Type Ii ◽  
Amino Acid Residues ◽  
Cysteine Desulfurase ◽  
Cofactor Binding ◽  
Pathogenic Variants ◽  
Expression Studies

Classical xanthinuria is a rare autosomal recessive metabolic disorder caused by variants in the XDH (type I) or MOCOS (type II) genes. Thirteen Israeli kindred (five Jewish and eight Arab) and two isolated cases from Germany were studied between the years 1997 and 2013. Four and a branch of a fifth of these families were previously described. Here, we reported the demographic, clinical, molecular and biochemical characterizations of the remaining cases. Seven out of 20 affected individuals (35%) presented with xanthinuria-related symptoms of varied severity. Among the 10 distinct variants identified, six were novel: c.449G>T (p.(Cys150Phe)), c.1434G>A (p.(Trp478*)), c.1871C>G (p.(Ser624*)) and c.913del (p.(Leu305fs*1)) in the XDH gene and c.1046C>T (p.(Thr349Ileu)) and c.1771C>T (p.(Pro591Ser)) in the MOCOS gene. Heterologous protein expression studies revealed that the p.Cys150Phe variant within the Fe/S-I cluster-binding site impairs XDH biogenesis, the p.Thr349Ileu variant in the NifS-like domain of MOCOS affects protein stability and cysteine desulfurase activity, while the p.Pro591Ser and a previously described p.Arg776Cys variant in the C-terminal domain affect Molybdenum cofactor binding. Based on the results of haplotype analyses and historical genealogy findings, the potential dispersion of the identified variants is discussed. As far as we are aware, this is the largest cohort of xanthinuria cases described so far, substantially expanding the repertoire of pathogenic variants, characterizing structurally and functionally essential amino acid residues in the XDH and MOCOS proteins and addressing the population genetic aspects of classical xanthinuria.

scholarly journals Robotic-assisted proximal gastrectomy using the double-flap technique for early gastric cancer with situs inversus totalis: a case report

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Atsushi Takeno ◽  
Toru Masuzawa ◽  
Shinsuke Katsuyama ◽  
Kohei Murakami ◽  
Kenji Kawai ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Situs Inversus ◽  
Autosomal Recessive ◽  
Intraoperative Complications ◽  
Proximal Gastrectomy ◽  
Situs Inversus Totalis ◽  
Upper Body ◽  
Robot Assisted ◽  
Case Presentation ◽  
First Case

Abstract Background The robotic system has been applied in the treatment of gastric cancer (GC), and the procedure has been found to be safe and feasible. Situs inversus totalis (SIT) is a relatively rare autosomal recessive congenital anomaly. We successfully performed robot-assisted proximal gastrectomy (RAPG) and handsewn double-flap esophagogastrostomy for GC in a patient with SIT. Case presentation A 71-year-old woman was referred to us with an asymptomatic ulcerative lesion in the upper body of the stomach. Computed tomography revealed that she had SIT. She was diagnosed with cT1bN0M0, cStageIA gastric cancer. RAPG with lymph node dissection and handsewn double-flap esophagogastrostomy was performed. Robotic surgery enabled the surgeon to perform the surgery without changing his position and experiencing any confusion resulting from the patient’s reversed anatomy. It took 448 min, and no intraoperative complications occurred. Her postoperative course was uneventful; she was discharged on postoperative day 10. The final pathologic report showed pT1b1N0M0, pStage IA. Conclusions This is the first case describing RAPG with handsewn double-flap esophagogastrostomy for a SIT patient with early GC.

scholarly journals Variable Expressivity of the Beckwith-Wiedemann Syndrome in Four Pedigrees Segregating Loss-of-Function Variants of CDKN1C

Genes ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 706
Author(s):  
Angela Sparago ◽  
Flavia Cerrato ◽  
Laura Pignata ◽  
Francisco Cammarata-Scalisi ◽  
Livia Garavelli ◽  
...  
Keyword(s):  
Cellular Proliferation ◽  
Missense Variant ◽  
Abdominal Wall Defects ◽  
Loss Of Function ◽  
Nonsense Mutations ◽  
Molecular Defects ◽  
Variable Expressivity ◽  
Imprinting Disorder ◽  
Perinatal Lethality ◽  
Intrafamilial Variability

Beckwith-Wiedemann syndrome (BWS) is an imprinting disorder characterized by prenatal and/or postnatal overgrowth, organomegaly, abdominal wall defects and tumor predisposition. CDKN1C is a maternally expressed gene of the 11p15.5 chromosomal region and is regulated by the imprinting control region IC2. It negatively controls cellular proliferation, and its expression or activity are frequently reduced in BWS. In particular, loss of IC2 methylation is associated with CDKN1C silencing in the majority of sporadic BWS cases, and maternally inherited loss-of-function variants of CDKN1C are the most frequent molecular defects of familial BWS. We have identified, using Sanger sequencing, novel CDKN1C variants in three families with recurrent cases of BWS, and a previously reported variant in a woman with recurrent miscarriages with exomphalos. Clinical evaluation of the patients showed variable manifestation of the disease. The frameshift and nonsense variants were consistently associated with exomphalos, while the missense variant caused a less severe phenotype. Pregnancy loss and perinatal lethality were found in the families segregating nonsense mutations. Intrafamilial variability of the clinical BWS features was observed, even between siblings. Our data are indicative of severe BWS phenotypes that, with variable expressivity, may be associated with both frameshift and nonsense variants of CDKN1C.

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