Identification of novel FBN1 and TGFBR2 mutations in 65 probands with Marfan syndrome or Marfan-like phenotypes.
Marfan syndrome is an autosomal dominant connective tissue disorder, and mutations in the FBN1 and TGFBR2 genes have been identified in probands with MFS and related phenotypes. Using DHPLC and sequencing, we studied the mutation spectrum in 65 probands with Marfan syndrome and related phenotypes. A total of 24 mutations in FBN1 were identified, of which 19 (nine missense, six frameshift, two nonsense and two affecting splice junctions) were novel. In the remaining 41 probands, six were identified to have novel TGFBR2 mutations (one frameshift and five missense mutations). All novel mutations found in this study were confirmed to be absent in 50 unrelated normal individuals of the same ethnic background. In probands who fulfilled the Ghent criteria (n = 16), mutations in FBN1 were found in 81% of cases. None of those with TGFBR2 mutations fulfilled the Ghent criteria. Novel missense mutations of unknown significance were classified according to the latest ACMG guidelines and their likelihood to be causative was evaluated.
Chung
Brian Hon-Yin
BH
Department of Paediatrics & Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong Special Administrative Region, China. bhychung@hkucc.hku.hk
Lam
Stephen Tak-Sum
ST
Tong
Tony Ming-For
TM
Li
Susanna Yuk-Han
SY
Lun
Kin-Shing
KS
Chan
Daniel Hon-Chuen
DH
Fok
Susanna Fung-Shan
SF
Or
June Siu-Fong
JS
Smith
David Keith
DK
Yang
Wanling
W
Lau
Yu-Lung
YL
D000293:Adolescent; D000328:Adult; D000595:Amino Acid Sequence; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D004252:DNA Mutational Analysis; D005260:Female; D000071838:Fibrillin-1; D000071837:Fibrillins; D005820:Genetic Testing; D006801:Humans; D008297:Male; D008382:Marfan Syndrome / Q000235:genetics*; D008840:Microfilament Proteins / Q000235:genetics*; D008875:Middle Aged; D008969:Molecular Sequence Data; D020125:Mutation, Missense; D010641:Phenotype; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*; D000077294:Receptor, Transforming Growth Factor-beta Type II; D018125:Receptors, Transforming Growth Factor beta / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D055815:Young Adult; D054392:Adipokines
D000071838:Fibrillin-1; D000071837:Fibrillins; D008840:Microfilament Proteins; D017346:Protein Serine-Threonine Kinases; D000077294:Receptor, Transforming Growth Factor-beta Type II; D018125:Receptors, Transforming Growth Factor beta; C000605722:FBN1 protein, human; D054392:Adipokines