Cystinuria Differential Diagnoses
- Author: Chandra Shekhar Biyani, MBBS, MS, DUrol, FRCS(Urol), FEBU; Chief Editor: Bradley Fields Schwartz, DO, FACS more...
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| Rosenberg et al[21] | Type I | Type II | Type III |
| Molecular | Type I | Non–Type I | |
| Responsible gene | SLC3A1 | SLC7A9 | |
| Band | 2p21 | 19q13.1 | |
| No. of mutations | >60 | 39 | |
| Most common mutation | M467 | V170M | |
| Population affected | Mediterranean Spanish persons, 40% | Libyan Jews | |
| Deletion rate | 54% | 25% | |
| Protein | rBAT | BAT1 | |
| Amino acid transport system | |||
| Localization in proximal converted tubule | S3 | S1, S2 | |
| Transporter characteristic | High affinity, low capacity | Low affinity, high capacity | |
| Clinical features | |||
| Homozygotes | Symptomatic | approximately 90% symptomatic | |
| Heterozygotes | Asymptomatic | approximately 10%-13% symptomatic | |
| Urinary cystine levels | Normal | Elevated +++++ | Elevated + |
| Plasma cystine levels after an oral load test | Same | Same or slight rise | Increased |
| Intestinal transport | Absent (no transport of cystine, lysine, or arginine) | Absent | Reduced |

