Recurrent de novo point mutations in lamin A cause Hutchinson-Gilford progeria syndrome.
Level 4 - case-series / case-control
Genetic sequencing and cellular analysis in a small case series of 20 patients
PubMed 12714972 · doi:10.1038/nature01629
What was done
Researchers mapped the candidate locus for Hutchinson-Gilford progeria syndrome (HGPS) to chromosome 1q using cytogenetic findings (two cases with 1q uniparental isodisomy and one with a 6-megabase paternal interstitial deletion) and sequenced the LMNA gene in 20 classical HGPS cases. Nuclear membrane morphology in HGPS fibroblasts was assessed using lamin A immunofluorescence.
What was found
18 of 20 classical HGPS cases carried an identical de novo single-base substitution, G608G (GGC > GGT), within exon 11 of LMNA, and 1 case carried a distinct mutation at the same codon (19 of 20 total). These mutations activate an exon 11 cryptic splice site, generating a mutant protein with a 50-amino-acid internal deletion near the carboxy terminus. Lamin A immunofluorescence revealed visible nuclear membrane abnormalities in many HGPS fibroblasts.
Why it matters
This study identifies the molecular cause of classical Hutchinson-Gilford progeria syndrome, directly linking defective lamin A processing and nuclear envelope structural abnormalities to accelerated aging phenotypes.
Limits
The study is restricted to a small cohort of 20 classical cases. The abstract does not report data on non-classical presentations, functional longitudinal outcomes, or quantitative cellular assays.
Cited by
- supports Francis Collins discovered the genetic mutation causing Hutchinson-Gilford progeria syndrome.