Here I present: “Hemochromatosis (type-2A)”, Victor McKusick, Mendelian Inheritance in Man’, 1966.
INTRODUCTION.
Hereditary Hemochromatosis (HH) consists of four (4) types; and, the type-two (#2) has A & B forms (shown ABOVE).
Juvenile hemochromatosis (also known as hemochromatosis type-2A) is a rare form of hereditary hemochromatosis, which emerges in young individuals, typically between 15 and 30 years of age, but occasionally later. It is characterized by an inability to control how much iron is absorbed by the body, in turn leading to iron overload, where excess iron accumulates in many areas of the body and causes damage to the places it accumulates.
Juvenile hemochromatosis type-2A (HFE2A) is caused by homozygous or compound heterozygous mutation in the gene encoding hemojuvelin (HJV) on cytogenetic location 1q21.1 and genomic coordinates 1:146,017,470-146,021,735 . The screenshot of the HJV gene 4,266 bp (base pairs) of DNA sequence length is shown BELOW. Nine (9) other genes besides HJV in the 1q21.1 cytogenetic location are listed BENEATH. 
| Coordinate | Symbol | Genomic Name. |
| 1:145,911,348 | PEX11B | Peroxisome biogenesis 11B |
| 1:145,921,556 | RBM8A | RNA-binding motif protein 8A |
| 1:145,964,690 | POLR3GL | Polymerase III, RNA, subunit G-like |
| 1:145,992,435 | TXNIP | Thioredoxin-interacting protein |
| 1:146,017,470 | HJV | Hemojuvelin |
| 1:146,064,699 | NBPF10 | Neuroblastoma breakpoint family, member 10 |
| 1:146,148,865 | NOTCH2NLA | NOTCH2 N-terminal-like protein A |
| 1:146,486,332 | HYDIN2 | HYDIN axoneme central apparatus protein-2 |
| 1:146,938,324 | NBPF12 | Neuroblastoma breakpoint family, member 12 |
| 1:147,155,106 | PRKAB2 | Protein kinase, AMP-activated, noncatalytic, β-2 |
