Diverse spatial, temporal, and sexual expression of recently duplicated androgen-binding protein genes in Mus musculus
© Laukaitis et al; licensee BioMed Central Ltd. 2005
Received: 05 April 2005
Accepted: 14 July 2005
Published: 14 July 2005
The genes for salivary androgen-binding protein (ABP) subunits have been evolving rapidly in ancestors of the house mouse Mus musculus, as evidenced both by recent and extensive gene duplication and by high ratios of nonsynonymous to synonymous nucleotide substitution rates. This makes ABP an appropriate model system with which to investigate how recent adaptive evolution of paralogous genes results in functional innovation (neofunctionalization).
It was our goal to find evidence for the expression of as many of the Abp paralogues in the mouse genome as possible. We observed expression of six Abpa paralogues and five Abpbg paralogues in ten glands and other organs located predominantly in the head and neck (olfactory lobe of the brain, three salivary glands, lacrimal gland, Harderian gland, vomeronasal organ, and major olfactory epithelium). These Abp paralogues differed dramatically in their specific expression in these different glands and in their sexual dimorphism of expression. We also studied the appearance of expression in both late-stage embryos and postnatal animals prior to puberty and found significantly different timing of the onset of expression among the various paralogues.
The multiple changes in the spatial expression profile of these genes resulting in various combinations of expression in glands and other organs in the head and face of the mouse strongly suggest that neofunctionalization of these genes, driven by adaptive evolution, has occurred following duplication. The extensive diversification in expression of this family of proteins provides two lines of evidence for a pheromonal role for ABP: 1) different patterns of Abpa/Abpbg expression in different glands; and 2) sexual dimorphism in the expression of the paralogues in a subset of those glands. These expression patterns differ dramatically among various glands that are located almost exclusively in the head and neck, where the sensory organs are located. Since mice are nocturnal, it is expected that they will make extensive use of olfactory as opposed to visual cues. The glands expressing Abp paralogues produce secretions (lacrimal and salivary) or detect odors (MOE and VNO) and thus it appears highly likely that ABP proteins play a role in olfactory communication.
Genome sequences of primates and rodents [1–3] now allow genome-wide investigations of evolutionary rates and selective processes. The aforementioned studies, and earlier ones, show that mammalian protein-coding genes vary dramatically in their rates of sequence divergence [1, 3–6] and that amino acid sequence divergence is greatest for secreted proteins whose genes are expressed in few tissues and least for intracellular proteins found widely in all tissues . These generalizations hold for the great majority (~90%; ) of genes that are present in single copies in both primate and rodent genomes. The remaining genes have experienced at least one duplication in either one or both of the primate and rodent lineages.
The process of gene duplication provides material for functional diversification. A newly-duplicated gene may subsequently acquire innovative function ("neofunctionalization") or may retain some of its progenitor gene's functional repertoire ("subfunctionalization"), or a combination of both [8–11]. Such duplicated genes are also rapidly diverging in sequence [1, 3] and they are substantially over-represented in functions relating to chemosensation, reproduction, host defense and immunity, and toxin metabolism. Innovation within these functional categories therefore can occur by sequence divergence and/or gene duplication. Adaptive evolution however can also act by modifying gene expression profiles, for example by restricting expression to few tissues. Among genes conserved as single orthologous copies among primate or mouse species, expression variation appears to evolve neutrally and approximately linearly with time [12, 13].
We were interested in a related question: How rapidly can expression profiles diverge among duplicated genes? For example, Gu  showed an increase in expression diversity in genes involved in Drosophila development. We wish to ask about diversification during other evolutionary process, to wit rapidly diverging duplicated genes involved in the four functions listed above. Because expression patterns appear to diverge substantially over long time periods, such as since the primate-rodent (Euarchontoglires) common ancestor [15, 16], it is necessary to address this question using many related genes that arose only in very recent times. The most closely-related vertebrate genomes available currently are those of mouse and rat; these lineages diverged approximately 12–24 million years ago (Mya) [17, 18]. Thus, by comparing these two genomes we may be able to identify a gene family that is extensively expanded in one, but not necessarily in the other genome, with which to investigate recent expression divergence.
Indeed, we recently identified two families of paralogous genes, clustered together in a 1–2 Mb region of Mus musculus chromosome 7 that each meet this criterion. We predict that the Euarchontoglires common ancestor, and the rat and mouse common ancestor, each contained a single member of both gene families; these family members were proximally positioned in a tightly linked head-to-head (bidirectional) gene pair [19, 20]. In humans and chimpanzees these genes have accumulated disruptive mutations and are thus likely to be nonfunctional pseudogenes. In the rat lineage, two gene pair duplications have given rise to three gene versions in each family. In the mouse lineage, an extraordinary and rapid burst of duplications has generated over a dozen members of each family, some of which harbor inactivating mutations, whereas others are full-length and apparently functional. Because these mouse genes appear to have all arisen via duplication events since the mouse-rat divergence (12–24 Mya), these are the genes we have chosen to investigate to address the issue of expression divergence.
The two families are termed Abpa and Abpb/Abpg genes (encoding ABPα and ABPβ/ABPγ proteins). They are named according to their proteins that were first described in the literature [21, 22]. Androgen-binding protein α subunit (ABPα) forms covalently linked heterodimers with either β or γ subunits, and these are secreted into the saliva following expression in the submaxillary gland. ABPα, ABPβ and ABPγ proteins are secretoglobins, a family of secreted proteins  that bind lipophilic ligands (for a review, see ) and are present in mammals and birds [25, 26], but whose roles in cellular and physiological function all remain obscure [27, 28].
Much of the previous work on salivary ABP has focused on determining its function ; reviewed briefly in . Laboratory tests of female preference for males carrying different genetic variants of salivary ABP have provided evidence that the protein may mediate sexual preference [29, 30]. A role in sexual selection is consistent with the evidence for positive selection in the microevolution of the gene (Abpa) for the α subunit, which has a different allele fixed in each of three subspecies of Mus musculus [31, 32]. These Abpa alleles show significantly reduced polymorphism both in their exons and introns and high ratios of nonsynonymous to synonymous nucleotide substitutions (KA/KS) in the coding region [33, 34]. Fixation of different alleles of Abpa in the subspecies of Mus musculus has been proposed to have occurred by selective sweeps . Abpb and Abpg also have high KA/KS values, suggesting that their microevolution has also been driven by positive selection [19, 20, 22].
Here we investigate the expression of 17 predicted Abpa, Abpb and Abpg genes in 23 mouse glands and other organs. We chose organs and glands to obtain as wide a representation of gene expression in the mouse as possible. We specifically included any tissues where expression of other secretoglobins has been identified (Harderian gland, lacrimal gland, lung, kidney, uterus, skin/sebaceous glands, salivary glands and prostate; ). In the head we surveyed the brain and (separately) olfactory lobes, parotid glands, sublingual glands, submaxillary glands, lacrimal glands, major olfactory epithelium (MOE), vomeronasal organ (VNO) and Harderian glands; in the body, we tested skin, adrenal gland, heart, spleen, kidney, testis, lung, liver, pancreas, small intestine, bladder, prostate, ovary and uterus. To test for expression similarity or divergence among paralogous genes we sought to identify transcripts in spatially-distinct tissues and from embryonic or adult individuals of different ages and/or sexes. Our results show how adaptive evolution among paralogous genes has led to expression divergence within a relatively short (12–24 My) period of time. We use these expression patterns to develop a model of paralogue neofunctionalization.
The quality of the cDNA made from RNA extracts was tested using an internal control, a primer set designed to amplify the housekeeping gene Gapdh . Only cDNA that showed the clear presence of a band of the expected size with the Gapdh primers was subsequently tested for Abpa/Abpbg transcripts (see Fig. 2, Panel B for an example of Gapdh expression). Because RNA preparations were treated with RNase-free DNase prior to their use as templates in PCR reactions, the product obtained with the Gapdh primers could confidently be ascribed to amplification of that transcript, rather than to the amplification of pseudogenes of corresponding size .
Although it was not our purpose in this study to precisely quantitate levels of expression of the individual paralogues, we did note reproducible variation in intensity of RT-PCR products. A series of dilutions of a typical template indicated that we could detect expression over a broad range. Most expressing tissues gave a negative result between 104 and 106 dilution.
Detection of transcripts in adult tissues
cDNA from 23 glands and other organs of adult C3H/HeJ mice was tested for the presence of transcripts of nine Abpa paralogues and eight Abpbg paralogues. As detailed below, we have found evidence of Abp expression in 10 of these glands/organs, and we demonstrate that multiple members of these gene families are differentially expressed. Equivalent amounts of RNA were tested for each tissue. All experiments in both male and female mice were repeated using tissue independently isolated from a second animal.
The expression patterns for all the glands and other organs that tested positive for Abp expression are summarized in Fig. 4 (the Harderian gland showed only faint bands for a few paralogues in one sex and thus is not included in the figure). We previously suggested that pairs of adjacent a and bg genes (i.e. those that are identically numbered) might be co-expressed in single tissues or organs . Certainly, the expression of a2 and bg2 paralogues appears correlated. The most commonly expressed paralogues are a11 and bg11 and, although their expression is not ubiquitous, in all cases they are co-expressed. In female submaxillary and sublingual glands, a10 and bg10 are both expressed, along with a11 and bg11, while only bg10 is expressed with a11 and bg11 in males. The bg10 paralogue is co-expressed with a11 and bg11 only in submaxillary and sublingual glands, but not in parotid glands. The parotid gland data are consistent with other findings . bg10 is co-expressed with its genomic partner a10 only in the female submaxillary gland. The a10 paralogue is expressed in a sexually dimorphic manner in the lacrimal, submaxillary and sublingual glands and in both sexes in the vomeronasal organ (VNO) and the MOE (Fig. 4).
Other paralogues (a5, a8, a13, bg8, and bg12) are expressed sporadically in various glands. Of these, only a5 and bg8 are members of a-bg pairs in the genome assembly (Fig. 4), but expression of a5 only occurs once (male lacrimal), while expression of its partner (bg5) was never observed; bg8 expression often occurs without that of its partner, a8. Notable for the absence of expression in any glands or other organs tested were a1, a12, a14, bg1, bg5 and bg9; of these, a12, a14 and bg9 are not paired with full-length a/bg genes, and thus might be pseudogenes despite their full-length coding sequences. On the other hand, a1 and bg1 and a5 and bg5 are paired in the genome so there appears to be no absolute rule determining whether paired or unpaired paralogues are expressed.
Thirteen glands and other organs tested negative for Abp expression, including brain, skin, adrenal gland, heart, spleen, kidney, testis, lung, liver, pancreas, small intestine, bladder and uterus. With the exception of skin and brain, these are mostly of endodermal and mesodermal origin and are located in the body cavity. By contrast, the glands that show Abp paralogue expression are mostly ectodermal in their origins, with the exception of the submaxillary and sublingual glands, which are endodermal.
Detection of transcripts in embryos and early postnatal stages
1) The a11/bg11 pair and bg10 are expressed in the head between e13 and birth;
2) Immediately following birth (i.e., day one), expression of bg10, and a11/bg11 appears but there is no evidence of any of the other paralogues that eventually are expressed in various tissues in the head (Fig. 5);
3) By day six, however, expression of other paralogues (i.e., in addition to bg10, and a11/bg11) appears in the submaxillary glands (a2/bg2, bg8, a10, and a13) and the lacrimal glands (a2/bg2, a5, a8/bg8, a10, a13 and bg12);
4) By contrast, the MOE/VNO region only expresses a11 and bg11 at day six, and bg10 and a11/bg11 at day 15. By this time point, there is no evidence as yet of paralogues (i.e., a2/bg2, a13, a8/bg8 and bg12) that are expressed in these tissues in adults;
5) It is also evident that the sexual dimorphism in expression of some of these paralogues has yet to occur by day 15.
The recent sequencing of numerous genomes has made possible comparative studies aimed at enhancing our understanding of gene evolution. It is clear from studies of mammalian genomes that the vast majority of genes have strongly conserved their coding sequences, and generally occur only in single copies [1–3]. Genes involved in adaptation and functional innovation, on the other hand, often show the footprints of positive selection in elevated ratios of nonsynonymous to synonymous nucleotide substitutions rates (KA/KS; ) in their coding regions. In addition, they are subject to frequent duplication, deletion and pseudogene formation . Prevalent amongst rapidly evolving genes are those involved in immunity, reproduction, chemosensation and toxin metabolism .
Mouse salivary androgen-binding protein genes Abpa and Abpbg have evolved under strong positive selection [19, 31, 33, 34, 41] and they have been duplicated extensively, mostly in pairs of Abpa/Abpbg genes, across a 1–2 Mb region of mouse chromosome 7 . This has been a recent expansion peculiar to the mouse, since the rat genome contains only three pairs of Abpa/Abpbg paralogues, and the human and chimpanzee genomes contain only a single pair whose members are both pseudogenes. These and other observations led to the hypothesis  that the common ancestor of mice and rats possessed only a single Abpa/Abpbg gene pair.
The recently released dog genome contains a single full-length Abpa/Abpbg pair, a finding which supports our proposal that this is the ancestral state in eutherian mammals . The cat genome also contains at least one Abpa/Abpbg pair and these are expressed as the subunits of the Fel dI dimer, the major allergen in the cat . We argue, based on the evolutionary distances (K S values) of the genes, that the alpha and beta/gamma-like genes of cat Fel dI are likely to be the orthologues of the Abpa and Abpbg genes. The median K S values between rodent Abpa or Abpbg genes and cat Fel dI are 1.25 and 0.87, respectively which are consistent with the reported substitution rate between rodent and cat orthologous sequence of 0.60  given that neutral rates typically vary within the genome by up to 3 fold. Since the cat orthologue, like a number of Abpabg orthologues, is expressed mainly in salivary glands [29, 42] it is possible that the original function of the ancestral Abpa/Abpbg genes involves secretion from salivary glands and subsequent application to the pelt of the animal.
The large cluster of mouse Abp paralogues qualifies in three respects as genes that are rapidly evolving under strong positive selection, namely elevated KA/KS and a fast duplication rate, and now data showing rapid diversification of gene expression following duplication. The question is which of the four most likely adaptive functions best fits our current understanding of ABP: immunity, reproduction, chemosensation or toxin metabolism? Karn and Dlouhy  showed that salivary ABP is ubiquitous in Old World and New World rodents, regardless of their diets, and noted that ABP binds androgens specifically and with relatively high affinity (see also  and ). They speculated that the function of ABP must be one general to rodents, such as mate recognition, rather than a diet-specific one, such as toxin metabolism. The expression patterns we report here also augur against a role in toxin metabolism because we could not find expression of any of the Abp paralogues in mouse liver or spleen, where detoxification of toxic metabolites might be expected to occur.
The developmental sequence of expression of these genes provides clues that help further narrow the choices of functional role for ABP. Abpa/Abpbg expression begins in the head of the embryo as early as 13 days of gestation, comprised of a relatively simple pattern of a11/bg11 and bg10. By the first day of life, this has changed little, but by six days many other paralogues are expressed in the submaxillary and lacrimal glands. Expression proceeds to 15 days of life without yet revealing the sexually dimorphic patterns seen in several glands in adult mice. The transition to sexually dimorphic expression following puberty appears incompatible with roles for these in host immune defense.
It is fascinating that the MOE and VNO are the last tissues to achieve an adult expression pattern. Unlike the lacrimal gland and the salivary glands, these are not secretory tissues. It may be that early expression in the pups' secretory tissues provides signals by which the female parent recognizes her offspring. The pups would not need MOE and VNO expression themselves at this early stage. This distinction hints at a role for ABP in chemosensation, perhaps by participating in detection and recognition of ABP subtypes. Paralogues expressed in the MOE and VNO could be involved in phenotype matching and/or in a system whereby a bound ligand is transferred between paralogues to augment the signal of a proteinaceous pheromone.
Recently, Grus et al.  studied V1R genes expressed in the VNOs of the dog, cow and opossum, reporting 8, 32 and 49 intact V1R genes, respectively, in these three species. The numbers of V1R genes in the genomes of mice and rats had been previously reported to be 187 and 102, respectively  while the human genome contains about 200 V1R genes, all but 4 of which appear to have been pseudogenized [47, 48]. Grus et al.  showed a concordance between V1R repertoire size and the complexity of VNO morphology and suggested that these characteristics of the VNO are indicative of the sophistication of pheromone communications within species. These findings are particularly interesting in the context of Abp evolution. We previously reported finding a single, pseudogenized Abp gene pair in both the human and the chimpanzee genomes, while the genomes of the mouse and rat had approximately 14 and 3 pairs of Abp genes, respectively, most of which had full-length ORFs . A single, full-length Abp gene pair in each of the dog and cat genomes would be consistent with a pattern of increasing importance of Abp genes in conspecific communication, proceeding from potentially no importance in primates to low importance in carnivores to relatively high importance in murid rodents, with the mouse utilizing the most number and diversity of Abp gene pairs.
In our recent paper , we demonstrated extensive sequence diversification in the numerous Abpa/Abpbg paralogues we predicted. In this report, we have shown that Abp genes have evolved multiple, often distinct, expression patterns. Once these patterns are mapped to these genes' proposed phylogenetic tree a surprising lack of congruency is observed (Fig. 5): the evolution of gene expression appears not to recapitulate the evolution of coding sequence. Thus it appears that neofunctionalization, rather than neutral drift, has driven the evolution of these genes' expression patterns over relatively short time periods.
The extensive diversification in expression of this family of proteins provides two lines of evidence for a pheromonal role for ABP: 1) different patterns of Abpa/Abpbg expression in different glands; and 2) sexual dimorphism in the expression of the paralogues in a subset of those glands. It is clear from our observations that expression patterns of many of the Abp paralogues differ dramatically among various glands that are located almost exclusively in the head and neck, where the sensory organs are located. Since mice are nocturnal, it is expected that they will make extensive use of olfactory as opposed to visual cues. The glands expressing Abp paralogues produce secretions (lacrimal and salivary) or detect odors (MOE and VNO) and thus it appears highly likely that ABP proteins play a role in olfactory communication. This supports the earlier suggestion, based on behavioral testing, that salivary ABP (the Abpa gene, now Abpa11) mediates mate preference [29, 30]. In the studies of Laukaitis et al., , females showed a stronger preference in experiments where the choice was between males tethered to the ends of the test chamber, than they did for the males' territories when the males were absent. Sniffing the face of the male would present the female with much more information (Fig. 4) than the male might leave in his territory in the form of shed skin flakes or hair which had been coated with saliva during grooming .
If the variety of proteins produced by expression of the mouse Abp paralogues act as components of a complex pheromone system, then the secretions of the lacrimal gland and salivary glands provide a constellation of olfactory information, such as an animal's age and sex. Indeed it has been proposed previously that polymorphism in salivary ABP communicates the species/subspecies of the animal [29–32, 49]. Thus we suggest that the strong evidence for involvement of Abp paralogous genes in adaptive evolution is consistent with a pheromonal role for their protein products.
Laukaitis et al.  proposed that the region between Abpa and Abpb (a11 and bg11 in  and in this study) could contain a sequence that coordinately regulates their expression. Emes et al.  suggested that this was possibly true of the bidirectional 5'-5' paired Abpa and Abpbg paralogue sets in general. The expression data we report here for a11 and bg11 is consistent with this idea since we have not seen either expressed independently of the other. However, it does not appear to hold true generally, since we observed independent expression of the members of a number of other pairs (e.g., bg10 in submaxillary and sublingual glands; a10 in VNO and MOE, etc.). Thus, regulation of the expressions of Abpa and Abpbg members of pairs must be more complex than simple coordinate up- or down-regulation of pairs. The lack of correlation between the evolutionary relationships of the Abpa/Abpbg paralogues  and their expression patterns (summarized in Fig. 5) support this notion, suggesting that sequences regulating expression of these genes have evolved in a manner that did not parallel the evolution of the structural genes. This implies rapid evolution of expression diversity in the Abpa/Abpbg paralogues.
Huminiecki and Wolfe  studied divergence of transcription profiles of genes in homologous tissues between human and mouse. They focused on loci where recent species-specific gene duplication occurred within one or the other species, allowing them to compare the transcription profiles of young paralogues in one species with a single orthologue in the other. They found that the presence of species-specific gene duplication accelerates the rate of expression divergence and that the recent duplicates are subject to reduced constraints on their protein sequences. In most cases, they observed that multiple changes in the spatial expression profile have occurred and they concluded that the expression in a new tissue suggests neofunctionalization. These results are consistent with those we reported earlier  and those that we report here for the recently and extensively duplicated Abpa/Abpbg genes in mice. This is perhaps an even more striking example because the single orthologous pair of Abpa/Abpbg genes in primates both degenerated into pseudogenes while expression in rodents has expanded into at least 9 tissues from the 2 tissues reported for the cat .
The multiple changes in the spatial expression profile of these genes resulting in various combinations of expression in glands and other organs in the head and face of the mouse strongly suggest that neofunctionalization of these genes, driven by adaptive evolution, has occurred following duplication. Primates represent an interesting contrast insofar as their single Abpa/Abpbg gene pair was pseudogenized, suggesting that its function has become dispensable. Many genes involved in olfactory and pheromonal cues have become pseudogenes in primates . Evolutionary and expression information thus both indicate a role for ABP and its paralogues in pheromonal communication among mice and, perhaps in other animals, one that is likely to be less important in the primate line, at least in the great apes.
The C3H/HeJ inbred strain of mice was purchased from Jackson Laboratory (Bar Harbor, ME). Mice at age 75–80 days were sacrificed by cervical dislocation; tissues and organs were removed and frozen immediately in liquid nitrogen and thereafter stored at -80°. Emes et al.  published the sequences of 14 Abpa paralogues and 13 Abpbg paralogues in mouse strain C57BL/6. Five of the Abpa paralogues and five of the Abpbg paralogues were predicted to be pseudogenes because of frameshifts and/or termination codons occurring early in their sequences. Primer sets were designed to specific forward and reverse sequences for the remaining nine Abpa and eight Abpbg paralogues. Primers were designed to avoid cross-hybridization between paralogues' sequences. Primer sets were purchased from Sigma-Genosys (St. Louis, MO). DNA from strain C57BL/6 was obtained from Jackson Laboratory for use in testing the primer sets.
RNA extraction, cDNA production and polymerase chain reaction (PCR)
RNA was purified from mouse tissues with a Sigma total RNA purification kit (Sigma Biochemicals, St. Louis, MO). Absorbances at 260 and 280 nm were determined and used to calculate yield, purity and concentration of RNA from tissue extractions. In some instances, the RNA was treated with RNase-free DNase (Sigma Biochemicals). Oligo-dT was used to prime first-strand synthesis from 1 μg of total RNA per 20 μl RT reaction essentially as described in  using Sigma AMV reverse transcriptase (Sigma Biochemicals). PCR was performed using Biolase (MidWest Scientific, St. Louis, MO) with 1μl of the RT reaction as previously described [31, 33], using a 61° annealing temperature and 20 sec denaturing, annealing and extension times for 30 cycles. The products were separated on 2% agarose gels.
Clean-up of PCR templates was performed using QiaQuick PCR clean-up spin columns (Qiagen Incorporated, Valencia, CA) according to the manufacturers protocol (Qiagen Incorporated) and automated sequencing was performed by ACGT, Inc. (Chicago, IL).
The authors thank M. Riley for assistance with dissections and J. Survance for help in obtaining embryos. This work was supported in part by the Holcomb Research Institute, Butler University. RDE and CPP were supported by the UK Medical Research Council. These sources of support are gratefully acknowledged.
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