def GetAlleleString(allele):
    """Get string representation of allele
    
    If it is a sequence, return upper case sequence
    If _SV type, return string representation

    Parameters
    ----------
    allele : ALT allele from vcf.Record
    
    Returns
    -------
    str_allele : str
       String representation of the allele
    """
    try:
        return allele.sequence.upper()
    except:
        return str(allele)