Biomaterial Database

Incidence, prevalence, and gene frequency studies of chronic childhood spinal muscular atrophy. 1978

J Pearn

A total population study of chronic childhood spinal muscular atrophy (arrested Werdnig-Hoffmann disease, Kugelberg-Welander disease, SMA type II and III) was undertaken in north-east England to establish gene and carrier frequencies, incidence, and prevalence. The incidence of this disease was 1 in 24 100 live births. Prevalence was 1.20 per 100,000 of the general population. A technique for estimating an autosomal recessive gene frequency in the known presence of dominant new mutations (or phenocopies), using data from a segregation analysis, is described. Gene frequency was in the range (0.00451 to 0.00659 (95% confidence limits), with a working estimate of 0.0055. Carrier rates for the autosomal recessive gene concerned were 1 in 76 to 1 in 111 (95%) confidence limits), with a working estimate of 1 in 90 for genetic counselling purposes.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D009133	Muscular Atrophy	Derangement in size and number of muscle fibers occurring with aging, reduction in blood supply, or following immobilization, prolonged weightlessness, malnutrition, and particularly in denervation.	Atrophy, Muscle,Neurogenic Muscular Atrophy,Neurotrophic Muscular Atrophy,Atrophies, Muscle,Atrophies, Muscular,Atrophies, Neurogenic Muscular,Atrophies, Neurotrophic Muscular,Atrophy, Muscular,Atrophy, Neurogenic Muscular,Atrophy, Neurotrophic Muscular,Muscle Atrophies,Muscle Atrophy,Muscular Atrophies,Muscular Atrophies, Neurogenic,Muscular Atrophies, Neurotrophic,Muscular Atrophy, Neurogenic,Muscular Atrophy, Neurotrophic,Neurogenic Muscular Atrophies,Neurotrophic Muscular Atrophies
D002675	Child, Preschool	A child between the ages of 2 and 5.	Children, Preschool,Preschool Child,Preschool Children
D004739	England	A part of Great Britain within the United Kingdom.
D005260	Female		Females
D005787	Gene Frequency	The proportion of one particular in the total of all ALLELES for one genetic locus in a breeding POPULATION.	Allele Frequency,Genetic Equilibrium,Equilibrium, Genetic,Allele Frequencies,Frequencies, Allele,Frequencies, Gene,Frequency, Allele,Frequency, Gene,Gene Frequencies
D005808	Genes, Recessive	Genes that influence the PHENOTYPE only in the homozygous state.	Conditions, Recessive Genetic,Genetic Conditions, Recessive,Recessive Genetic Conditions,Condition, Recessive Genetic,Gene, Recessive,Genetic Condition, Recessive,Recessive Gene,Recessive Genes,Recessive Genetic Condition
D006580	Genetic Carrier Screening	Identification of individuals who are heterozygous at a GENETIC LOCUS for a recessive PHENOTYPE.	Carriers, Genetic, Detection,Genetic Carriers, Detection,Heterozygote Detection,Carrier Detection, Genetic,Detection, Genetic Carrier,Genetic Carrier Detection,Heterozygote Screening,Carrier Screening, Genetic,Detection, Heterozygote,Screening, Genetic Carrier,Screening, Heterozygote,Screenings, Genetic Carrier
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012737	Sex Factors	Maleness or femaleness as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or effect of a circumstance. It is used with human or animal concepts but should be differentiated from SEX CHARACTERISTICS, anatomical or physiological manifestations of sex, and from SEX DISTRIBUTION, the number of males and females in given circumstances.	Factor, Sex,Factors, Sex,Sex Factor