Background
Methodology
Blood collection, measurement of hematological parameters, and case history
Eosin 5’ maleimide binding assay (EMA)
CD44 antibody binding assay
Isolation of DNA and mutational analysis of SEC23B gene using sanger sequencing
High-resolution melting (HRM) analysis for screening of SEC23B-Y462C mutation
Results
Clinical data
Family | Proband | Age at diagnosis/ Sex | RBC (x106/ul) | Hb (g/dL) | HCT (%) | MCV (fl.) | MCHC (g/dL) | RDW (%) | Retic (%) | BM-LM | Presenting Symptoms | EMA (MCF) |
---|---|---|---|---|---|---|---|---|---|---|---|---|
F1 | II – 2 | 5Y/M | 1.89 | 4.3 | 13.8 | 73 | 31.2 | 29.7 | 3 | Erythroid hyperplasia, few bi & multinucleated erythroblasts, occasional karyorrhectic forms, mild dyserythropoiesis | Chronic anemia, Hepato-Splenomegaly | 849 |
F2 | II – 1 | 33Y/M | 2.16 | 5.8 | 17.3 | 80.1 | 33.5 | 23 | 0.9 | Erythroid hyperplasia, binucleated erythroblasts, dyserythropoiesis | Pallor, Icterus, anemia Cholelithiasis, haemolytic facies | 593 |
F3 | II – 1 | 3 m/M | 2.7 | 7.5 | 20.7 | 76.7 | 36.2 | 15.2 | 9 | Not Done | Severe anemia, hepato-splenomegaly, neonatal jaundice | 886 |
F4 | II – 2 | 9 Y/ F | 2.64 | 6.9 | 19.1 | 72.3 | 36.1 | 27.3 | 8 | Erythroid Hyperplasia, binucleated erythroblasts | Chronic anemia, Hyperbilirubinemia | 630 |
F5 | II – 3 | 12Y/M | 2.66 | 7 | 21.5 | 80.8 | 32.6 | 30 | 4 | Not Done | Severe anemia, Icterus | 995 |
F6 | II – 1 | 9Y/ M | 1.65 | 6.2 | 18.3 | 110.9 | 33.9 | 20.7 | 2.4 | Erythroid Hyperplasia, a large number of bilobed erythroid cells, some nuclear bridging | Severe anemia, Neonatal Jaundice, splenomegaly | 850 |
F7 | II – 3 | 13Y/M | 3.33 | 8.3 | 24.4 | 73.3 | 34 | 24.8 | 1.3 | Not Done | Chronic haemolytic anemia, Icterus, Pallor, hepatosplenomegaly | 780 |
II – 2 | 18Y/F | 2.94 | 8.8 | 24.1 | 82 | 36.5 | 22.1 | 1.6 | Erythroid hyperplasia, mild dyserythropoiesis, multinucleated erythroblasts, karyorrhexis, nuclear bridging | Severe anemia, recurrent jaundice, pallor, chipmunk facies | 856 | |
F8 | II − 3 | 15Y/M | 3.68 | 9.9 | 32 | 87 | 30.9 | 26 | 5 | Not Done | Anemia, pallor, icterus, moderate splenomegaly | 754 |
F9 | II − 2 | 12Y/M | 3.0 | 7.4 | 22.5 | 75 | 32.9 | 21.7 | 0.1 | Dyserythropoietic normoblasts | Severe pallor, severe anemia, neonatal jaundice, splenomegaly | 918 |
F10 | II − 2 | 6 m/F | 1.8 | 4 | 12.8 | 71.1 | 31.3 | 29.1 | 2.8 | Not Done | Severe pallor, anemia, hemangioma | 926 |
Flow cytometric analysis of EMA binding assay and anti-CD44 antibody binding assay
Sanger sequencing for SEC23B-Y462C mutation
Family | Number | Relationship | Clinical Diagnosis | Nucleotide change | Amino acid change | |
---|---|---|---|---|---|---|
Sanger Sequencing | HRM analysis | |||||
F1 | I – 1 | Mother | Normal | TAT/TGT | TAT/TGT | N/Y462C |
I – 2 | Father | Normal | TAT/TGT | TAT/TGT | N/Y462C | |
II – 1 | Daughter | Normal | TAT/TAT | TAT/TAT | N/N | |
II − 2 | Son |
CDA
| TGT/TGT | TGT/TGT | Y462C/Y462C | |
F2 | I – 1 | Mother | Normal | TAT/TGT | TAT/TGT | N/Y462C |
I – 2 | Father | Normal | TAT/TGT | TAT/TGT | N/Y462C | |
II – 1 | Son |
CDA
| TGT/TGT | TGT/TGT | Y462C/Y462C | |
II – 2 | Daughter | Normal | Not Done | Not Done | Not Done | |
II − 3 | Daughter | Normal | Not Done | Not Done | Not Done | |
F3 | I – 1 | Mother | Normal | TAT/TGT | TAT/TGT | N/Y462C |
I – 2 | Father | Normal | TAT/TGT | TAT/TGT | N/Y462C | |
II − 1 | Son |
CDA
| TGT/TGT | TGT/TGT | Y462C/Y462C | |
F4 | I – 1 | Mother | Normal | TAT/TGT | TAT/TGT | N/Y462C |
I – 2 | Father | Normal | TAT/TGT | TAT/TGT | N/Y462C | |
II- 1 | Daughter | Normal | TAT/TGT | TAT/TGT | N/Y462C | |
II – 2 | Daughter |
CDA
| TGT/TGT | TGT/TGT | Y462C/Y462C | |
II − 3 | Son | Normal | TAT/TGT | TAT/TGT | N/Y462C | |
F5 | I – 1 | Mother | Normal | TAT/TGT | TAT/TGT | N/Y462C |
I – 2 | Father | Normal | TAT/TGT | TAT/TGT | N/Y462C | |
II – 1 | Son | Normal | TAT/TAT | TAT/TAT | N/N | |
II – 2 | Daughter | Normal | Not Done | Not Done | Not Done | |
II − 3 | Son |
CDA
| TGT/TGT | TGT/TGT | Y462C/Y462C | |
F6 | I – 1 | Mother | Normal | TAT/ TGT | TAT/ TGT | N/Y462C |
I – 2 | Father | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
II − 1 | Son |
CDA
| TGT/ TGT | TGT/ TGT | Y462C/Y462C | |
F7 | I – 1 | Mother | Normal | TAT/ TGT | TAT/ TGT | N/Y462C |
I – 2 | Father | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
II – 1 | Daughter | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
II – 2 | Daughter |
CDA
| TGT/ TGT | TGT/ TGT | Y462C/Y462C | |
II − 3 | Son |
CDA
| TGT/ TGT | TGT/ TGT | Y462C/Y462C | |
F8 | I – 1 | Mother | Normal | TAT/ TGT | TAT/ TGT | N/Y462C |
I – 2 | Father | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
II – 1 | Son |
CDA
| TGT/ TGT | TGT/ TGT | Y462C/Y462C | |
II − 2 | Son | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
F9 | I – 1 | Mother | Normal | TAT/ TGT | TAT/ TGT | N/Y462C |
I – 2 | Father | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
II – 1 | Daughter | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
II – 2 | Son |
CDA
| TGT/ TGT | TGT/ TGT | Y462C/Y462C | |
II − 3 | Daughter | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
F10 | I – 1 | Mother | Normal | TAT/ TGT | TAT/ TGT | N/Y462C |
I – 2 | Father | Normal | TAT/ TGT | TAT/ TGT | N/Y462C | |
II – 1 | Daughter | Not Done | Not Done | Not Done | Not Done | |
II − 2 | Daughter |
CDA
| TGT/ TGT | TGT/ TGT | Y462C/Y462C |