[Genetic analysis of 90 families affected with spinal muscular atrophy]. 2020

Tao Li, and Xue Lyu, and Poshi Xu, and Jie Zou, and Hai Xiao, and Qiannan Guo, and Hongdan Wang, and Hongyan Liu
Department of Medicine Laboratory, Henan Provincial People's Hospital, Central China Fuwai Hospital, Central China Fuwai Hospital of Zhengzhou University, Zhengzhou, Henan 450003, China. liuhongyanqhhy@126.com.

OBJECTIVE To carry out genetic testing and prenatal diagnosis for 90 families affected with spinal muscular atrophy (SMA), and discuss the necessity for carrier screening. METHODS All families were subjected to multiplex ligation-dependent probe amplification (MLPA) analysis. Combined MLPA and allele-specific PCR (AS-PCR) was used for prenatal diagnosis of the pregnant women. RESULTS Among the 90 couples, 84 (93%) had a negative family history, 85 (94%) had given birth to an affected child before. Eighty-five husbands and 88 wives carried heterozygous deletion of exon 7 of the SMN1 gene. Two wives had homozygous deletion of exon 7 of the SMN1 gene and were affected. Prenatal diagnosis showed that 19 fetuses were SMA patients, 48 fetuses were carriers, and 23 fetuses were normal. Of note, eighteen affected fetuses were conceived by couples without a family history, which accounted for 20% of all pregnancies and 95% of all affected fetuses. CONCLUSIONS To screen SMA carriers using MLPA and carry out prenatal diagnosis using combined MLPA and AS-PCR can ensure accurate diagnosis, which has a significant value for the prevention of SMA affected births.

UI MeSH Term Description Entries
D009134 Muscular Atrophy, Spinal A group of disorders marked by progressive degeneration of motor neurons in the spinal cord resulting in weakness and muscular atrophy, usually without evidence of injury to the corticospinal tracts. Diseases in this category include Werdnig-Hoffmann disease and later onset SPINAL MUSCULAR ATROPHIES OF CHILDHOOD, most of which are hereditary. (Adams et al., Principles of Neurology, 6th ed, p1089) Bulbospinal Neuronopathy,Oculopharyngeal Spinal Muscular Atrophy,Progressive Muscular Atrophy,Scapuloperoneal Form of Spinal Muscular Atrophy,Spinal Muscular Atrophy,Adult Spinal Muscular Atrophy,Adult-Onset Spinal Muscular Atrophy,Amyotrophy, Neurogenic Scapuloperoneal, New England Type,Distal Spinal Muscular Atrophy,Hereditary Motor Neuronopathy,Muscular Atrophy, Adult Spinal,Myelopathic Muscular Atrophy,Myelopathic Muscular Atrophy, Progressive,Progressive Myelopathic Muscular Atrophy,Progressive Proximal Myelopathic Muscular Atrophy,Proximal Myelopathic Muscular Atrophy, Progressive,Scapuloperoneal Spinal Muscular Atrophy,Spinal Amyotrophy,Spinal Muscular Atrophy, Distal,Spinal Muscular Atrophy, Oculopharyngeal,Spinal Muscular Atrophy, Scapuloperoneal,Spinal Muscular Atrophy, Scapuloperoneal Form,Adult Onset Spinal Muscular Atrophy,Amyotrophies, Spinal,Amyotrophy, Spinal,Atrophies, Progressive Muscular,Atrophy, Myelopathic Muscular,Atrophy, Progressive Muscular,Atrophy, Spinal Muscular,Bulbospinal Neuronopathies,Hereditary Motor Neuronopathies,Motor Neuronopathies, Hereditary,Motor Neuronopathy, Hereditary,Muscular Atrophies, Progressive,Muscular Atrophy, Myelopathic,Muscular Atrophy, Progressive,Neuronopathies, Bulbospinal,Neuronopathies, Hereditary Motor,Neuronopathy, Bulbospinal,Neuronopathy, Hereditary Motor,Progressive Muscular Atrophies,Spinal Amyotrophies
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D011296 Prenatal Diagnosis Determination of the nature of a pathological condition or disease in the postimplantation EMBRYO; FETUS; or pregnant female before birth. Diagnosis, Prenatal,Fetal Diagnosis,Fetal Imaging,Fetal Screening,Intrauterine Diagnosis,Antenatal Diagnosis,Antenatal Screening,Diagnosis, Antenatal,Diagnosis, Intrauterine,Prenatal Screening,Antenatal Diagnoses,Antenatal Screenings,Diagnosis, Fetal,Fetal Diagnoses,Fetal Imagings,Fetal Screenings,Imaging, Fetal,Intrauterine Diagnoses,Prenatal Diagnoses,Prenatal Screenings,Screening, Antenatal,Screening, Fetal,Screening, Prenatal
D005260 Female Females
D005820 Genetic Testing Detection of a MUTATION; GENOTYPE; KARYOTYPE; or specific ALLELES associated with genetic traits, heritable diseases, or predisposition to a disease, or that may lead to the disease in descendants. It includes prenatal genetic testing. Genetic Predisposition Testing,Genetic Screening,Predictive Genetic Testing,Predictive Testing, Genetic,Testing, Genetic Predisposition,Genetic Predictive Testing,Genetic Screenings,Genetic Testing, Predictive,Predisposition Testing, Genetic,Screening, Genetic,Screenings, Genetic,Testing, Genetic,Testing, Genetic Predictive,Testing, Predictive Genetic
D006720 Homozygote An individual in which both alleles at a given locus are identical. Homozygotes
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D017384 Sequence Deletion Deletion of sequences of nucleic acids from the genetic material of an individual. Deletion Mutation,Deletion Mutations,Deletion, Sequence,Deletions, Sequence,Mutation, Deletion,Mutations, Deletion,Sequence Deletions
D055533 Survival of Motor Neuron 1 Protein An SMN complex protein that contains a TUDOR DOMAIN and is essential for the function of the SMN protein complex. In humans, the protein is encoded by a single gene found near the inversion TELOMERE of a large inverted region of CHROMOSOME 5. Mutations in the gene coding for survival of motor neuron 1 protein may result in SPINAL MUSCULAR ATROPHIES OF CHILDHOOD. SMN Protein (Spinal Muscular Atrophy),Survival Motor Neuron Protein 1,Survival of Motor Neuron 1, Telomeric Protein

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