Expression and functional SNP loci screen of ATM from coal worker's pneumoconiosis / 中华劳动卫生职业病杂志

Objective: To detect of gene expression and genotype of the ataxia telangiectasia mutated (ATM) from coal workers' pneumoconiosis (CWP) , It is explored whether CWP is related to ATM gene. Methods: In October 2020, the relevant information of 264 subjects who received physical examination or medical treatment in the Department of occupational diseases of Guiyang public health treatment center from January 2019 to September 2020 was collected. Through the occupational health examination, 67 healthy people with no history of exposure to occupational hazards were selected as the healthy control group; The coal miners with more than 10 years of coal dust exposure history and small shadow in the lung but not up to the diagnostic criteria were the dust exposure control group, a total of 66 people; The patients with the same history of coal dust exposure and confirmed stage I were coal worker's pneumoconiosis stage I group, a total of 131 people. The expression of ATM was detected by QRT PCR. ATM rs189037 and rs1801516 were genotyped by massarray. Results: There was significant difference in the expression of ATM among the groups (P<0.05) ; Compared with the healthy control group, the expression of ATM in the dust exposed control group was significantly increased (P<0.05) . With the occurrence and development of CWP, the GG of rs189037 wild type decreased, the GA of mutant heterozygote and AA of homozygote increased, but the difference was not statistically significant (P>0.05) ; Rs1801516 wild type GG and mutant heterozygote GA had no significant changes (P>0.05) . There were significant differences in age, neutrophils and basophils among rs189037 groups (all P<0.05) . There were no significant differences in blood pressure, eosinophils, lymphocytes, monocytes, smoking and drinking history among rs189037 groups (all P>0.05) . Compared with wild-type GG, the or of mutant heterozygotes and homozygotes increased, but the differences were not statistically significant (P>0.05) . Conclusion: ATM gene may be one of the early activation genes of CWP and rs189037 may be the functional loci which affects gene expression. ATM gene is related to inflammatory response, Neutrophils and basophils have an impact on the development of CWP.

Siblings Seckel's syndrome 1 caused by ATR gene variants in a sibpair / 中华医学遗传学杂志

OBJECTIVE@#Two brothes with Seckel's syndrome 1(SCKL1) were reported and a literature review was carried to provide clinical and genetic information of this rare disease.@*METHODS@#Clinical data of the two children were collected, and the peripheral blood was extracted for whole exome sequencing. Literature of the disease were reviewed.@*RESULTS@#The two patients were 11 years and 9.5 years old when examined for short stature. They presented with intrauterine growth retardation, intellectual disability, microcephaly, birdhead-like face and coffee au lait spots. The bone age was more than 2 years behind the chronical age and the growth hormone levels were normal. Whole exome sequencing revealed novel compound heterozygous variants c.1A>G (p.M1?) and c.4853-18A>G of ART gene in both children.@*CONCLUSION@#Children with prenatal onset short stature, developmental delay, microcephaly and special facial featuresshould be considered for the possibility of Seckel's syndrome, whole exome sequencing could help to confirm the clinical diagnosis.

Nueva mutación en el gen ATM en paciente con ataxis telangiectasia: Caso clínico / New mutation in ATM gen in patient whith Ataxia Telangiectasia: Clinical case

Introducción: El síndrome de ataxia telangiectasia (AT) es una enfermedad genética autosómica recesiva de compromiso multisistémico, con un espectro clínico amplio, ocasionada por la mutación del gen ATM, lo que causa la disminución o ausencia de la proteinkinasa ATM, por lo que se alteran procesos del ciclo celular, reparación del ADN y apoptosis. El objetivo de este artículo es el de reportar el caso de una paciente con síndrome de AT causada por una mutación no reportada previamente en la literatura. Caso clínico: Paciente originaria de Colombia, de 14 años de edad, con manifestaciones clínicas y fenotípicas clásicas del síndrome de AT a partir de los 6 años de edad, con alteración pondoestatural, infecciones respiratorias a repetición, telangiectasias oculocutáneas y compromiso neurológico progresivo, caracterizado por regresión en su desarrollo psicomotor, ataxia y apraxia oculomotora. Se realizó secuenciación del gen ATM que demostró mutación en homocigosis no reportada previamente en la literatura. Discusión: En Latinoamérica son escasos los reportes de pacientes con AT y pocos aquellos en donde se describen los hallazgos moleculares. Los estudios moleculares son una herramienta que facilita el diagnóstico y permite orientar mejor el manejo y pronóstico de pacientes con enfermedades neurodegenerativas. El reporte de variantes moleculares no descritas es de gran importancia para establecer la causa etiológica de este tipo de patologías en grupos poblacionales diversos, como lo son los países de Latinoamérica.

Introduction: The ataxia telangiectasia syndrome (AT) is a genetic disease with an autosomal recessive inheritance pattern, with multisystem involvement and a broad clinical spectrum. It is caused by the mutation of the ATM gene, causing reduction or absence of the ATM proteinkinase, altering processes in the cell cycle, DNA repair and apoptosis. The objective of this article is to report the case of a patient with ataxia telangiectasia syndrome, caused by a mutation not previously reported in the literature. Case report: A 14 year-old patient native to Colombia, with classic clinical and phenotypical manifestations of AT syndrome, which started at 6 years of age with pondostatural alteration, recurrent respiratory infections, oculocutaneus telangiectasias and progressive neurological disorder that included: regression in her psychomotor development, ataxia and oculomotor apraxia. ATM gene sequencing is performed evidencing a homozygous mutation not reported in literature. Discussion: In Latin America are sparse the number of reports of patients with ataxia telangiectasia and only few of these describe their molecular findings. Molecular studies allow the diagnosis and a better orientation in the management and prognosis of patients with neurodegenerative diseases. The report of undescribed molecular variants is of great importance to establish the etiology of such diseases in diverse population groups, such as the countries of Latin America.

ATM polymorphisms IVS24-9delT, IVS38-8T>C, and 5557G>A in Mexican women with familial and/or early-onset breast cancer / Polimorfismos IVS24-9delT, IVS38-8T>C y 5557G>A en el gen ATM en mujeres mexicanas con cáncer de mama familiar o de inicio temprano

Objective. To assess whether in Mexican population the frequencies of ATM polymorphisms IVS24-9delT, IVS38-8-T>C, and 5557G>A in breast cancer (BC) cases and healthy controls were different from those found in other countries. Materials and methods. Frequencies of polymorphisms conferring BC risk IVS24-9delT, IVS38-8T>C, and 5557G>A were analyzed by PCR-RFLP in 94 patients with familial and/or early onset BC, and 97 healthy controls randomly selected. Allele frequencies analysis was done using χ² and Hardy-Weinberg test. Results. Frequencies of heterozygous were: for 5557G>A, 13% cases, 0%controls (p=0.0009); for IVS24-9delT, 21% cases, 8% controls (p=0.0122); for IVS38-8T>C, only one case. 5557G>A and IVS24-9delT were more frequent in cases than in controls. The allelic frequencies found in 5557G>A are similar to those described by González-Hormazábal in Chile. Conclusion. The similarity of results in this polymorphism between Chilean and Mexican populations may be due to both being crossbred with an Amerindian-Spanish component, while differences may be due to fact that Chilean population has a greater European component than Mexican's.

Objetivo. Evaluar si en la población mexicana las frecuencias de los polimorfismos IVS-9delT, IVS38-8T>C y 5557G>A en casos de cáncer de mama y en controles sanos son diferentes de las encontradas en otros países. Material y métodos. Los polimorfismos IVS24-9delT, IVS38-8T>C y 5557G>A fueron analizados mediante PCR-RFLPs en 94 pacientes con CM de tipo familiar o de inicio temprano y 97 testigos seleccionadas de forma aleatoria. El análisis de la frecuencia alélica se hizo mediante χ² y equilibrio de Hardy-Weinberg. Resultados. Las frecuencias de heterocigotos fueron 5557G>A, 13% de casos, 0% de testigos (p=0.0009); IVS24-9delT, 21% de casos, 8% de testigos (p=0.0l22); IVS38-8T>C, sólo un caso. 5557G>A y IVS24-9delT fueron más frecuentes en casos que en testigos. Las frecuencias alélicas encontradas en 5557G>A son similares a las descritas por González-Hormazábal en Chile. Conclusión. La similitud de resultados en este polimorfismo entre la población chilena y mexicana puede ser debida a que ambas son mestizas con un componente amerindio-español. Las diferencias encontradas podrían explicarse porque la población chilena tiene mayor componente europeo que la mexicana.

Ataxia-Telangiectasia with Novel Splicing Mutations in the ATM Gene

No abstract available.

Identification of ATM Mutations in Korean Siblings with Ataxia-Telangiectasia

Ataxia-telangiectasia (A-T) is a rare autosomal recessive neurodegenerative disorder. It is characterized by early-onset, progressive cerebellar ataxia, oculomotor apraxia, choreoathetosis, conjunctival telangiectasias, immunodeficiency, and an increased risk of malignancy. Although A-T is known to be the most common cause of progressive cerebellar ataxia in childhood, there have been no confirmed cases in Korea. We report the clinical and genetic findings of Korean siblings who presented with limb and truncal ataxia, oculomotor apraxia, choreoathetosis, and telangiectasias of the eyes. Sequence analysis of the ataxia-telangiectasia mutated (ATM) gene revealed a known missense mutation (c.8546G>C; p.Arg2849Pro) and a novel intronic variant of intron 17 (c.2639-19_2639-7del13). Reverse-transcription PCR and sequencing analysis revealed that the c.2639-19_2639-7del13 variant causes a splicing aberration that potentiates skipping exon 18. Because A-T is quite rare in Korea, the diagnosis of A-T in Korean patients can be delayed. We recommend that a diagnosis of A-T should be suspected in Korean patients exhibiting the clinical features of A-T.

Identification of ATM Mutations in Korean Siblings with Ataxia-Telangiectasia

Ataxia-telangiectasia (A-T) is a rare autosomal recessive neurodegenerative disorder. It is characterized by early-onset, progressive cerebellar ataxia, oculomotor apraxia, choreoathetosis, conjunctival telangiectasias, immunodeficiency, and an increased risk of malignancy. Although A-T is known to be the most common cause of progressive cerebellar ataxia in childhood, there have been no confirmed cases in Korea. We report the clinical and genetic findings of Korean siblings who presented with limb and truncal ataxia, oculomotor apraxia, choreoathetosis, and telangiectasias of the eyes. Sequence analysis of the ataxia-telangiectasia mutated (ATM) gene revealed a known missense mutation (c.8546G>C; p.Arg2849Pro) and a novel intronic variant of intron 17 (c.2639-19_2639-7del13). Reverse-transcription PCR and sequencing analysis revealed that the c.2639-19_2639-7del13 variant causes a splicing aberration that potentiates skipping exon 18. Because A-T is quite rare in Korea, the diagnosis of A-T in Korean patients can be delayed. We recommend that a diagnosis of A-T should be suspected in Korean patients exhibiting the clinical features of A-T.