title: Genetic mapping of chronic childhood-onset spinal muscular atrophy to chromosome 5q11.2-13.3.
abstract: SPINAL muscular atrophy (SMA) describes a group of heritable degenerative diseases that selectively affect the alpha-motor neuron. Childhood-onset SMAs rank second in frequency to cystic fibrosis among autosomal recessive disorders, and are the leading cause of heritable infant mortality. Predictions that genetic heterogeneity underlies the differences between types of SMA, together with the aggressive nature of the most-severe infantile form, make linkage analysis of SMA potentially complex. We have now analysed 13 clinically heterogeneous SMA families. We find that 'chronic' childhood-onset SMA (including intermediate SMA or SMA type II, and Kugelberg-Welander or SMA type III) is genetically homogeneous, mapping to chromosomal region 5q11.2-13.3.
authors.affiliation: Department of Psychiatry, Columbia University, New York, New York.
authors.forename: L M
authors.initials: LM
authors.lastname: Brzustowicz
authors.forename: T
authors.initials: T
authors.lastname: Lehner
authors.forename: L H
authors.initials: LH
authors.lastname: Castilla
authors.forename: G K
authors.initials: GK
authors.lastname: Penchaszadeh
authors.forename: K C
authors.initials: KC
authors.lastname: Wilhelmsen
authors.forename: R
authors.initials: R
authors.lastname: Daniels
authors.forename: K E
authors.initials: KE
authors.lastname: Davies
authors.forename: M
authors.initials: M
authors.lastname: Leppert
authors.forename: F
authors.initials: F
authors.lastname: Ziter
authors.forename: D
authors.initials: D
authors.lastname: Wood
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002874:Chromosome Mapping; D002895:Chromosomes, Human, Pair 5; D005787:Gene Frequency; D005819:Genetic Markers; D006801:Humans; D007223:Infant; D008126:Lod Score; D009134:Muscular Atrophy, Spinal / Q000235:genetics*
chemical_list: D005819:Genetic Markers