TLDR No clear link between androgen receptor variation and hair loss, but more research needed.
This document is a summary of four different studies that investigated the potential relationship between androgen receptor copy number variation (CNV) and androgenetic alopecia (AGA). The first study found no evidence of CNV in the AR gene in any of the cases or controls, suggesting no significant association between AGA and AR CNV. The second study also found no evidence of CNV in the regions of the AR that were examined. The third study found no evidence of AR CNV in DNA derived from lymphocytes, but could not rule out CNV around the AR in DNA contained in the cells of the hair follicles themselves. The fourth study found a significant association between AR gene CNV and AGA, suggesting that AR gene CNV may play a role in the development of AGA.
60 citations,
January 2007 in “Human Genetics” AR polyglycine repeat doesn't cause baldness.
195 citations,
July 2005 in “American Journal of Human Genetics” Genetic variation in the androgen receptor gene mainly causes early-onset hair loss, with maternal inheritance playing a key role.
76 citations,
April 2005 in “Cancer Epidemiology, Biomarkers & Prevention” E211 G>A gene linked to lower risk of severe prostate cancer and hair loss.
32 citations,
December 2004 in “BMC Public Health” Men can report their own balding patterns well enough for large health studies.
87 citations,
March 2011 in “Australasian Journal of Dermatology” Genetics and hormones play a role in male and female hair loss, but more research is needed to fully understand it.
11 citations,
November 2012 in “Seminars in Cutaneous Medicine and Surgery” Genetic factors affect hair loss, and molecular testing may help predict, diagnose, and treat it.
1 citations,
January 2022 in “Springer eBooks” 
3 citations,
September 2019 in “PLOS ONE” Genetic variations affect dutasteride treatment response for male pattern hair loss.
89 citations,
September 2010 in “Annual Review of Genomics and Human Genetics” The document concludes that understanding the genes and pathways involved in hair growth is crucial for developing treatments for hair diseases.
41 citations,
March 2012 in “Clinical and Experimental Dermatology” G allele of AR Stul polymorphism linked to higher hair loss risk, especially in white people.
