If you want to add new key-value pairs one by one, you can use the scalar form: 
$gene{$key} = $value;

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The slice form can be used if you are inserting a hash into a hash, which is not the case here.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: pushing multiple key-value pairs into an existing hash by choroba
in thread pushing multiple key-value pairs into an existing hash by lomSpace

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