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Genetics. Mar 2011; 187(3): 981–984.
PMCID: PMC3048786

Polymorphic Regions Affecting Human Height Also Control Stature in Cattle


Orthologous positions of 55 genes associated with height in four human populations were located on the bovine genome. Single nucleotide polymorphisms close to eight of these genes were significantly associated with stature in cattle (Bos taurus and Bos indicus). This suggests that these genes may contribute to controlling stature across mammalian species.

UNDERSTANDING the genetic basis for variation in complex traits has been advanced by many genome-wide association studies (GWAS) conducted in humans (Donnelly 2008) and, to a lesser extent, in other species (e.g., Karlsson et al. 2007). However, there is still considerable debate on the interpretation of these studies. Most of the single nucleotide polymorphisms (SNPs) associated with complex traits account for a very small proportion of the genetic variance in the trait (Visscher 2008). This could be because they are in incomplete linkage disequilibrium (LD) with the causative polymorphism, because the causative polymorphism has a small effect on the trait, or because the minor allele at this polymorphism is rare. The first and third of these explanations tend to apply to the same cases because a rare causative allele cannot be in complete LD with a common allele at a SNP on a standard chip. Other explanations include genotype by environment interactions, epistasis, and allelic heterogeneity. It has even been suggested that most of these associations are artifacts caused by cryptic stratification of the sample of individuals used (McClellan and King 2010). One of the reasons for skepticism is that there is often no known mechanism linking the genes found by a GWAS to the complex trait with which they are associated.

There are many examples of traits affected by single genes where mutations in the same gene cause a similar phenotype in different species. Classic examples include genes with a role in pigmentation, such as the Mc1r gene responsible for fair hair color in humans (Valverde et al. 1995) and coat or feather color in species as diverse as horse, pig, and chicken (Andersson 2003). For polygenic traits, where there are many genes with small-to-moderate effect, there is little information on the extent to which the orthologous genes cause variation in different mammalian species. However, there is evidence to suggest a high degree of conservation of certain gene classes among mammalian species, e.g., milk protein genes and mammary genes (Lemay et al. 2009). Evidence that the same genes are involved in controlling a complex trait would be important for several reasons. First, it would act as the ultimate validation study because stratification is unlikely to cause the same artifact in different species. Second, it would be strong evidence for a physiological connection between a gene in LD with an associated SNP and the trait. Third, it would provide some insight into the forces controlling genetic variation in complex traits.

Stature is an easy-to-measure phenotype used as a model complex trait in humans (Visscher 2008) and also measured in some domesticated cattle breeds (Barwick et al. 2009). In four separate GWAS of human stature, a total of 58 loci were significantly associated with stature in Caucasians (Gudbjartsson et al. 2008; Lettre et al. 2008; Weedon et al. 2008) and a further 15 loci have been reported in a Korean population (Kim et al. 2010). To test if these loci were controlling stature in cattle, we first identified the positions of orthologous genes that could be matched to Bovine Genome Build 4.0 in the NCBI database (http://www.ncbi.nlm.nih.gov/projects/genome/guide/cow/). We were able to successfully map the positions of 55 genes (some genes were close neighbors and were considered to be at the same location). There were 879 SNPs that were 500 kbp either side of these genes on the BovineSNP50 BeadChip (Illumina, San Diego, CA; Matukumalli et al. 2009), which comprises around 50,000 approximately equally spaced SNPs. The names of the orthologous genes and their bovine map positions are presented in supporting information, Table S1. We tested these SNPs for their effect on bovine stature in two cattle populations (dairy and beef cattle). The dairy data included 1832 Holstein dairy bulls with estimated breeding values for stature (hip height) based on at least 80 milking daughters per sire. The beef data set comprised hip height on 1224 Brahman and tropical composite beef heifers (Bos taurus × Bos indicus) measured at the end of the first post-weaning wet season when the heifers were aged ~18 months (Barwick et al. 2009). We observed a skew in the quantile-quantile plot (see Figure 1), which indicates that more SNPs are associated with stature than would be expected by chance. Of 879 SNPs tested, 10 and 12 were associated with stature (P < 0.001) in dairy and beef data sets, respectively (Table 1).

Figure 1.
Quantile-quantile plot of P-values of 879 SNPs that were 500 kbp either side of 55 orthologous genes found to be associated with height in human populations (Lettre et al. 2008; Gudbjartsson et al. 2008; Weedon et al. 2008; Kim et al. 2010). Using the ...
Dairy and beef cattle SNPs associated with stature within 500 kbp of genes associated with human height

We used a randomized permutation test to evaluate how likely it was to retrieve this number of SNPs with P < 0.001 by chance. We repeated the tests between bovine SNPs and stature by selecting 55 genes at random (SNPs in the 1-Mbp region surrounding each gene) and counted the number of associations that were P < 0.001. Figure 2 shows the distribution of 10,000 random tests (for each data set). Only 0.19% and 0.38% of the randomized permutation tests in beef and dairy cow data, respectively, had fractions equal to or exceeding the results observed for stature. Therefore, it is unlikely that the results reported here for stature in dairy and beef cattle arose by chance. Note that the genes identified as stature orthologs were included in the data set used for the randomized permutation test. However, the same pattern of results was observed when the stature orthologs were excluded.

Figure 2.
A frequency distribution of the proportion of SNPs with a P < 0.001 effect on stature in dairy and beef cattle data sets in 10,000 control tests. To make the tests comparable to the results reported in Figure 1, 55 genes were randomly selected ...

Of 55 orthologous genes tested, the SNPs that were associated with stature in cattle were close to 10 genes and 8 genomic regions (Table 1). Six of these had significant SNPs in either beef or dairy cattle, while significant SNPs in both dairy and beef cattle were observed in two regions containing the gene NCAPG and a cluster on chromosome 14 (PLAG1, CHCHD7, and RDHE2). NCAPG has previously been associated with fetal growth (Eberlein et al. 2009) and carcass size (Setoguchi et al. 2009) in cattle and is thought to have a role in cell division (Murphy and Sarge 2008). The strongest signal in our study was observed for a SNP close to HMGA2 in the beef data set (2.7 × 10−10). This gene has consistently been found to be associated with stature in human studies (Visscher 2008), and it is interesting that it seems likely that it has a conserved role in cattle, too. There were only two SNPs that had associations with stature in both beef and dairy cattle data sets. This is not surprising as the SNP density of the Illumina BovineSNP50 BeadChip is insufficient to expect the phase of LD to persist across breeds as diverse as beef and dairy cattle (de Roos et al. 2008).

These results provide a unique confirmation of the significant associations found in human GWAS for height. The power to detect associations in the cattle experiments described is not high (there were <2000 animals in each study) so associations with all the SNPs tested is not expected. Furthermore, the physiological control of height is probably not identical in the two species. However, by using a series of 10,000 randomized permutation tests, we were able to show that achieving the number of associations listed in Table 1 by chance would be very unlikely (Figure 2). Together, these results add considerable weight to the conclusion that several genes identified in human GWAS for stature also have a conserved role in the physiology of growth in cattle, including a role in regulating cell division and cell cycle.

If many complex traits have a similar architecture in different species, then humans could in fact be used as a model for identifying genes for complex traits in non-model species such as primates, marsupials, and cetaceans. Comparing GWAS across species, as done here, will aid understanding of gene pathways that contribute to complex traits.


We thank colleagues from our funding organizations for their assistance in a variety of ways. We are grateful for funding from the Cooperative Research Centre for Beef Genetic Technologies, Armidale, New South Wales, Australia, and the Cooperative Research Centre for Innovative Dairy Products, Melbourne, Australia.


Supporting information is available online at http://www.genetics.org/cgi/content/full/genetics.110.123943/DC1.

Available freely online through the author-supported open access option.


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