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© Research
Publication : Human molecular genetics

Identification of a Y chromosome haplogroup associated with reduced sperm counts

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Human molecular genetics - 01 Sep 2001

Krausz C, Quintana-Murci L, Rajpert-De Meyts E, Jørgensen N, Jobling MA, Rosser ZH, Skakkebaek NE, McElreavey K

Link to Pubmed [PMID] – 11555623

Hum. Mol. Genet. 2001 Sep;10(18):1873-7

In man, infertility is associated with microdeletions of specific regions of the long arm of the Y chromosome. This indicates that factors encoded by the Y chromosome are necessary for spermatogenesis. However, the majority of men with either idiopathic azoospermia or oligozoospermia have grossly intact Y chromosomes and the underlying causes of their infertility are unknown. We hypothesized that some of these individuals may carry other rearrangements or sequence variants on the non-recombining region of the Y chromosome that may be associated with reduced spermatogenesis. To test this hypothesis, we typed the Y chromosome in a group of Danish men with known sperm counts and compared the haplotype distribution with that of a group of unselected Danish males. We found that one class of Y chromosome, referred to as haplogroup 26+, was significantly overrepresented (27.9%; P < 0.001) in the group of men with either idiopathic oligozoospermia (defined as <20 x 10(6 )sperm/ml) or azoospermia compared to the control Danish male population (4.6%). This study defines, for the first time, a class of Y chromosome that is at risk for infertility in a European population. This observation suggests that selection may be indeed active on the Y chromosome, at least in the Danish population, raising the possibility that it could alter the pattern of Y chromosome haplotype distribution in the general population.

http://www.ncbi.nlm.nih.gov/pubmed/11555623