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Hutchinson-Gilford progeria types defined by differential binding of lectin DSA
Insights
Hutchinson-Gilford Progeria Syndrome (progeria) presents two distinct fibroblast types (D- and D+) based on lectin binding. The D- type shows significantly lower binding affinity to the DSA lectin, indicating altered glycosylation in some progeria patients.
Area of Science:
- Biochemistry
- Cell Biology
- Genetics
Background:
- Hutchinson-Gilford Progeria Syndrome (progeria) is a rare premature aging disorder.
- Previous studies noted increased glycoprotein gp200 in progeria skin fibroblasts.
- Glycosylation alterations are implicated in progeria pathogenesis.
Purpose of the Study:
- To investigate further glycosylation differences in progeria skin fibroblasts.
- To identify distinct subgroups within progeria fibroblast populations based on lectin interactions.
Main Methods:
- Utilized lectin binding assays, specifically with Dolichos biflorus agglutinin (DSA).
- Compared DSA binding affinities to glycoproteins from various progeria fibroblast strains and control strains.
- Tested other lectins (Con A, GNA, PHA-L, RCA120, AAA, PNA) for differential binding.
Main Results:
- Identified two progeria fibroblast groups: D- and D+, based on DSA lectin response.
- D- group fibroblasts (AG03513B, AG10750) exhibited markedly lower DSA binding affinity compared to controls.
- D+ group fibroblasts (AG01972A, AG06297A, AG06917, AG03198) showed DSA binding comparable to controls.
- Other tested lectins did not show selective binding between progeria and control groups.
Conclusions:
- The study provides evidence for two distinct types of progeria skin fibroblasts (D- and D+).
- Differential DSA lectin binding suggests altered glycosylation patterns in the D- type of progeria.
- These findings contribute to understanding the heterogeneity of glycosylation defects in progeria.
Abstract:
Hutchinson-Gilford Progeria Syndrome (progeria) is an extremely rare childhood disorder characterized by precocious senility which presents features similar to those seen in human aging. We have previously described a consistent increase of the glycoprotein gp200 in progeria skin fibroblasts in vitro. Here we extend these glycosylation studies and present evidence for the existence of two types of progeria skin fibroblasts. These two forms, called D- and D+, are distinguished by their response to the lectin DSA. In the D- group, DSA bound glycoproteins from progeria fibroblast strains AG03513B and AG10750 with markedly lower affinities compared with glycoproteins from three control fibroblast strains. In the D+ group, DSA binding to glycoproteins from four other progeria strains AG01972A, AG06297A, AG06917 and AG03198, was comparable to controls. Discrimination by DSA is the most distinctive feature of the D- and D+ groups, in contrast to binding of lectins Con A, GNA, PHA-L, RCA120, AAA and PNA which show no such selectivity. The data are consistent with a model of altered glycosylation in the D- type of progeria fibroblasts.