This is how the hash basically looks (it goes on for about 6 million lines (genes)):

$VAR1 = {
          'microT' => {
                        'mmu-miR-704' => {
                                           'NM_009309' => '1',
                                           'NM_133983' => '1',
                                           'NM_175563' => '1',
                                           'NM_010889' => '1',
                                           'NM_008302' => '1',
                                           'NM_022023' => '1',
                                           'NM_009567' => '1',
                                           'NM_172938' => '1',
                                           'NM_029777' => '3',
                                           'NM_134189' => '1',
                                           'NM_175025' => '1',
                                           'NM_177327' => '1',
                                           'NM_026807' => '1',
                                           'NM_178779' => '3',
                                           'NM_010770' => '1',
                                           'NM_031998' => '1',
                                           'NM_145584' => '2',
                                           'NM_207682' => '1',
                                           'NM_001005525' => '1',
                                           'NM_080853' => '1',
                                           'NM_145519' => '1',
                                           'NM_031249' => '1',
                                           'NM_172923' => '1',
                                           'NM_001008700' => '1',
                                           'NM_198617' => '1',
                                           'NM_027400' => '1',
                                           'NM_026406' => '2',
                                           'NM_021296' => '2',
                                           'NM_027652' => '1',
                                           'NM_001045530' => '1',
                                           'NM_018830' => '1',
                                           'NM_025314' => '1',
                                           'NM_009041' => '1',
                                           'NM_026829' => '3',
                                           'NM_026618' => '1',
                                           'NM_027472' => '1',
                                           'NM_027870' => '1',
                                           'NM_001033239' => '1',
                                           'NM_026348' => '1',
                                           'NM_008223' => '1',
                                           'NM_009595' => '2',
                                           'NM_146094' => '1',
                                           'NM_144945' => '1',
                                           'NM_019510' => '1',
                                           'NM_001033251' => '1',
                                           'NM_001081213' => '3',
                                           'NM_008031' => '1',
                                           'NM_028719' => '1',
                                           'NM_133352' => '1',
                                           'NM_008133' => '1',
                                           'NM_008317' => '1',
                                           'NM_021327' => '1',
                                           'NM_178751' => '1',
                                           'NM_010260' => '1',
                                           'NM_025683' => '1',
                                           'NM_026383' => '1',
                                           'NM_001081367' => '1',
                                           'NM_001033354' => '2',
                                           'NM_026034' => '1',
                                           'NM_173395' => '1',
                                           'NM_010762' => '1',
                                           'NM_024432' => '1',
                                           'NM_175113' => '1',
                                           'NM_001077425' => '1',
                                           'NM_026374' => '1',
                                           'NM_026655' => '1',
                                           'NM_177345' => '1',
                                           'NM_027412' => '1',
                                           'NM_183187' => '1',
                                           'NM_016687' => '1',
                                           'NM_175640' => '1',
                                           'NM_007559' => '1',
                                           'NM_011269' => '1',
                                           'NM_010252' => '1',
                                           'NM_019657' => '1',
[download]

I'm not very familiar with Tie::Hash, so if you can give me a quick heads up on how I can use it to save time it would be great

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