---
name: "Bio::Variation::Allele"
section: "3pm"
platform: "linux"
package: "libbio-variation-perl"
version: "1.7.5-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Bio::Variation::Allele"
---

# Bio::Variation::Allele(3pm)

Sequence object with allele-specific attributes

## NAME

Bio::Variation::Allele - Sequence object with allele-specific attributes

## SYNOPSIS

```
  $allele1 = Bio::Variation::Allele->new ( -seq => 'A',
                                           -id  => 'AC00001.1',
                                           -alphabet => 'dna',
                                           -is_reference => 1
                                         );
```

## DESCRIPTION

List of alleles describe known sequence alternatives in a variable region. Alleles are contained in Bio::Variation::VariantI complying objects. See Bio::Variation::VariantI for details.

Bio::Varation::Alleles are PrimarySeqI complying objects which can contain database cross references as specified in Bio::DBLinkContainerI interface, too.

A lot of the complexity with dealing with Allele objects are caused by null alleles; Allele objects that have zero length sequence string.

In addition describing the allele by its sequence , it possible to give describe repeat structure within the sequence. This done using methods repeat\_unit (e.g. 'ca') and repeat\_count (e.g. 7).

## FEEDBACK

### Mailing Lists

User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to the  Bioperl mailing lists  Your participation is much appreciated.

```
  bioperl-l@bioperl.org                  - General discussion
  http://bioperl.org/wiki/Mailing_lists  - About the mailing lists
```

### Support

Please direct usage questions or support issues to the mailing list:

*bioperl-l@bioperl.org*

rather than to the module maintainer directly. Many experienced and  reponsive experts will be able look at the problem and quickly  address it. Please include a thorough description of the problem  with code and data examples if at all possible.

### Reporting Bugs

Report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution.  Bug reports can be submitted via the web:

```
  https://github.com/bioperl/bioperl-live/issues
```

## AUTHOR - Heikki Lehvaslaiho

Email:  heikki-at-bioperl-dot-org

## APPENDIX

The rest of the documentation details each of the object methods. Internal methods are usually preceded with a \_

### is\_reference

```
 Title   : is_reference
 Usage   : $obj->is_reference()
 Function: sets and returns boolean values.
           Unset values return false.
 Example : $obj->is_reference()
 Returns : boolean
 Args    : optional true of false value
```

### add\_DBLink

```
 Title   : add_DBLink
 Usage   : $self->add_DBLink($ref)
 Function: adds a link object
 Example :
 Returns :
 Args    :
```

### each\_DBLink

```
 Title   : each_DBLink
 Usage   : foreach $ref ( $self->each_DBlink() )
 Function: gets an array of DBlink of objects
 Example :
 Returns :
 Args    :
```

### repeat\_unit

```
 Title   : repeat_unit
 Usage   : $obj->repeat_unit('ca');
 Function:
            Sets and returns the sequence of the repeat_unit the
            allele is composed of.
 Example :
 Returns : string
 Args    : string
```

### repeat\_count

```
 Title   : repeat_count
 Usage   : $obj->repeat_count();
 Function:
            Sets and returns the number of repeat units in the allele.
 Example :
 Returns : string
 Args    : string
```

### count

```
 Title   : count
 Usage   : $obj->count();
 Function:
            Sets and returns the number of times this allele was observed.
 Example :
 Returns : string
 Args    : string
```

### frequency

```
 Title   : frequency
 Usage   : $obj->frequency();
 Function:
            Sets and returns the frequency of the allele in the observed
            population.
 Example :
 Returns : string
 Args    : string
```