Typical features in Laurence-Moon, Bardet-Biedl, and Alström syndromes
| Feature | Laurence–Moon | Bardet–Biedl | Alström |
|---|---|---|---|
| Retinal dystrophy | + | + | + |
| Mental retardation | + | +/− | − |
| Obesity | + | + | + |
| Polydactyly | − | +/− | − |
| Hypogenitalism | + | +/− | +/− |
| Nerve deafness | − | − | + |
| Diabetes mellitus | − | +/− | + |
| Paraplegia | + | − | − |
| Renal disease | − | + | + |