Pedigree¶

class hail.genetics.Pedigree[source]¶

Class containing a list of trios, with extra functionality.

Parameters: trios (list of Trio) – list of trio objects to include in pedigree

Attributes

trios

List of trio objects in this pedigree.

Methods

`complete_trios`	List of trio objects that have a defined father and mother.
`filter_to`	Filter the pedigree to a given list of sample IDs.
`read`	Read a PLINK .fam file and return a pedigree object.
`write`	Write a .fam file to the given path.

complete_trios()[source]¶

List of trio objects that have a defined father and mother.

Return type: list of Trio

filter_to(samples)[source]¶

Filter the pedigree to a given list of sample IDs.

Notes

For any trio, the following steps will be applied:

If the proband is not in the list of samples provided, the trio is removed.

If the father is not in the list of samples provided, pat_id is set to None.

If the mother is not in the list of samples provided, mat_id is set to None.

Parameters: samples (list [str]) – Sample IDs to keep.
Returns: Pedigree

classmethod read(fam_path, delimiter='\\s+')[source]¶

Read a PLINK .fam file and return a pedigree object.

Examples

>>> ped = hl.Pedigree.read('data/test.fam')

Notes

See PLINK .fam file for the required format.

Parameters

fam_path (str) – path to .fam file.
delimiter (str) – Field delimiter.

Return type

Pedigree

property trios¶

List of trio objects in this pedigree.

Return type: list of Trio

write(path)[source]¶

Write a .fam file to the given path.

Examples

>>> ped = hl.Pedigree.read('data/test.fam')
>>> ped.write('output/out.fam')

Notes

This method writes a PLINK .fam file.

Caution

Phenotype information is not preserved in the Pedigree data structure in Hail. Reading and writing a PLINK .fam file will result in loss of this information. Use import_fam() to manipulate this information.

Parameters: path (str) – output path