Erythrocytosis, familial, 1 (ECYT1) [MIM:133100]: An autosomal dominant disorder characterized by increased serum red blood cell mass, elevated hemoglobin and hematocrit, hypersensitivity of erythroid progenitors to erythropoietin, erythropoietin low serum levels, and no increase in platelets nor leukocytes. It has a relatively benign course and does not progress to leukemia. {ECO:0000269|PubMed:8506290, ECO:0000269|PubMed:8608241}. Note=The disease is caused by mutations affecting the gene represented in this entry.
MUTAGEN 114 114 T->A: Little effect on EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 115 115 S->A: Little effect on EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 116 116 S->A: 10-fold reduction in EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 117 117 F->A,L: Greatly reduced EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 117 117 F->W: 60-fold reduction in EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 117 117 F->Y: 8-fold reduction in EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 118 118 V->A: 16-fold reduction in EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 120 120 L->A: Some reduction in EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 121 121 E->A: Little effect on EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 165 165 R->A: Little effect on EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 174 174 M->A: Little effect on EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 176 176 S->A: 16-fold reduction in EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 177 177 H->A: Little effect on EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 179 179 R->A: Little effect on EPO binding. {ECO:0000269|PubMed:8662939}.; MUTAGEN 454 454 Y->F: Some loss of SOCS3 binding. {ECO:0000269|PubMed:12027890}.; MUTAGEN 456 456 Y->F: Inhibition of STAT1/STAT3 activity. No effect on STAT5 activity. Some loss of SOCS3 binding. {ECO:0000269|PubMed:11756159, ECO:0000269|PubMed:12027890}.; MUTAGEN 468 468 Y->F: No effect on STAT1/STAT3 nor STAT5 activity. {ECO:0000269|PubMed:11756159}.