title: H RAS mutations in haematologically normal individuals.
abstract: BACKGROUND
  Point mutations in N, K and H RAS have been found in adverse haematological malignancies. The background frequency of RAS mutations in the normal population has yet to be determined. Here we report the results of a screen for RAS mutations from normal individuals.
  
  
  METHODS
  DNA from peripheral blood or bone marrow from 115 haematologically normal individuals was screened for point mutations in N, K and H RAS, at amino acid positions 12, 13 and 61. The screening was done using polymerase chain reaction and oligonucleotide hybridisation and candidate mutations were subsequently confirmed by cloning and sequencing.
  
  
  CONCLUSIONS
  Point mutations were identified in DNA from two of the 115 individuals. Both mutations resulted in an amino acid substitution at position 12 in H RAS. Both individuals with detectable H RAS mutations remain haematologically normal.
authors.affiliation: Hematology Department, University of Wales College of Medicine, Heath Park, Cardiff CF14 4XN, UK.
authors.forename: C
authors.initials: C
authors.lastname: Taylor
authors.forename: J
authors.initials: J
authors.lastname: Larghero
authors.forename: C
authors.initials: C
authors.lastname: Thomas
authors.forename: N
authors.initials: N
authors.lastname: Warren
authors.forename: G
authors.initials: G
authors.lastname: Carter
authors.forename: D
authors.initials: D
authors.lastname: Hughes
authors.forename: D
authors.initials: D
authors.lastname: Culligan
authors.forename: A
authors.initials: A
authors.lastname: Al-Sabah
authors.forename: J A
authors.initials: JA
authors.lastname: Whittaker
authors.forename: C
authors.initials: C
authors.lastname: Chomienne
authors.forename: R A
authors.initials: RA
authors.lastname: Padua
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019943:Amino Acid Substitution; D003062:Codon / Q000235:genetics*; D004247:DNA / Q000235:genetics; D011905:Genes, ras; D006801:Humans; D008875:Middle Aged; D020125:Mutation, Missense; D017354:Point Mutation; D016133:Polymerase Chain Reaction; D012016:Reference Values; D017422:Sequence Analysis, DNA
chemical_list: D003062:Codon; D004247:DNA