Abstract:
:Genome-wide association studies typically target inherited autosomal variants, but less studied genetic mechanisms can play a role in complex disease. Sex-linked variants aside, three genetic phenomena can induce differential risk in maternal versus paternal lineages of affected individuals: 1. maternal effects, reflecting the maternal genome's influence on prenatal development; 2. mitochondrial variants, which are inherited maternally; 3. autosomal genes, whose effects depend on parent of origin. We algebraically show that small asymmetries in family histories of affected individuals may reflect much larger genetic risks acting via those mechanisms. We apply these ideas to a study of sisters of women with breast cancer. Among 5,091 distinct families of women reporting that exactly one grandmother had breast cancer, risk was skewed toward maternal grandmothers (p<0.0001), especially if the granddaughter was diagnosed between age 45 and 54. Maternal genetic effects, mitochondrial variants, or variant genes with parent-of-origin effects may influence risk of perimenopausal breast cancer.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Weinberg CR,Shi M,DeRoo LA,Taylor JA,Sandler DP,Umbach DMdoi
10.1371/journal.pgen.1004174subject
Has Abstractpub_date
2014-03-20 00:00:00pages
e1004174issue
3eissn
1553-7390issn
1553-7404pii
PGENETICS-D-13-02714journal_volume
10pub_type
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