What is the fine-grained topic of the following text: This study sought to identify new susceptibility genes, using an alternative gene-wide analytical approach which tests for patterns of association within genes, in the powerful genome-wide association dataset of the International Genomics of Alzheimer's Project Consortium, comprising over 7 m genotypes from 25,580 Alzheimer's cases and 48,466 controls. Only return the topic.
Identification of new susceptibility genes for Alzheimer's disease using a gene-wide analytical approach.