title: Pandas adding extra row to DataFrame when assigning index
body: <p>I'm trying to use the 0th column ("Gene.name") as the Index values. Here's the original data below:
  <a href="https://i.stack.imgur.com/4swe6.png" rel="noreferrer"><img src="https://i.stack.imgur.com/4swe6.png" alt="enter image description here"></a></p>
  
  <p>I tried to set the index a few different ways.  The first was using <code>index_col=0</code> in the <code>DataFrame</code> creation.  I also tried <code>DF_mutations.index = DF_mutations["Gene.name"]</code> but they both led to an empty row underneath the header show below:
  <a href="https://i.stack.imgur.com/pf9UX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/pf9UX.png" alt="enter image description here"></a></p>
  
  <p><strong>How can I get rid of this extra row when I'm reassigning the index values?</strong> </p>