Main characteristics of HHVs.
The herpesvirus family comprises several widespread infectious pathogens. They infect a variety of animal hosts, including humans and cause complex clinical outcomes. Recently, the possible correlation between genital infection by human herpesviruses (HHVs) and male infertility has attracted considerable attention. In this chaper, we investigated the mechanism of HHV‐1‐induced infertility in transgenic (Tg) rats and its possible correlation with infertility in human males. Ectopic expression of HHV‐1 thymidine kinase (TK) in the testis of Tg rats increased male infertility. In addition, truncated TK proteins were found in postmeiotic spermatids of Tg rat testis, leading to progressive degeneration of germ cells and vacuolization of the seminiferous epithelium. These findings suggest the possibility that a similar process occurs within HHV‐infected human germ cells.
- thymidine kinase
- genital infection
- male infertility
Herpesviruses belong to a family of double‐stranded DNA (dsDNA) viruses commonly causing herpes in animals. They present a unique four‐layered structure. The outermost layer corresponds to the envelope, a lipid bilayer membrane interspersed with glycoproteins. This encases the tegument, a protein coat that surrounds the icosahedral nucleocapsid containing the viral linear DNA genome (Figure 1) . At present, over 130 herpesvirus species have been identified, eight of which are known as human herpesviruses (HHVs): HHV‐1 and HHV‐2 (commonly called herpes simplex virus‐1 and ‐2; HSV‐1 and HSV‐2), HHV‐3 (varicella‐zoster virus; VZV), HHV‐4 (Epstein‐Barr virus; EBV), HHV‐5 (cytomegalovirus; CMV), HHV‐6 (human herpesvirus 6, including HHV‐6A and HHV‐6B), HHV‐7 (human herpesvirus 7), and HHV‐8 (Kaposi’s sarcoma‐associated herpesvirus; KSHV). HHVs are divided into three subfamilies (α‐, β‐ and γ‐herpesviruses) based on their unique properties (Table 1) . HHVs are widespread among humans to the extent that more than 90% of adults are thought to be infected with at least one variety . HHVs generally infect ectoderm‐derived tissues, such as skin, mucoepithelial tissue and nervous tissue; however, they usually show preference for specific target cells/tissues and ensuing clinical outcomes (Table 1) . In addition, many people carrying the virus may be asymptomatic due to the latency of associated transcripts, which help HHVs evade the host's immune response . Moreover, HHVs hide in specific cells during latent infection periods (Table 1).
During the last decade, numerous studies have demonstrated that genital infections are often associated with human infertility, especially in males . Most recently, genital infections caused by herpesviruses have attracted considerable attention [5–7]. Although herpes genitalis can be mainly caused by HHV‐1 and HHV‐2 , other HHVs have also been frequently detected in the genital organs of infertile male patients [9–11]. Although not fully demonstrated, there is a possible correlation between human male infertility and HHVs.
Our laboratory recently developed a line of transgenic (Tg) rats expressing a chimeric gene with the promoter of porcine follicle‐stimulating hormone β subunit (FSHβ) and the open reading frame of HHV‐1 thymidine kinase (TK). Unexpectedly, we observed that Tg rats showed infertility upon ectopic expression of HHV‐1‐TK in the testis, independent of the FSHβ promoter . Indeed, we found that the accumulation of HHV‐1‐TK protein in postmeiotic spermatids was the cause of male infertility . In this study, we used the Tg rat model to elucidate the HHV‐mediated mechanism responsible for male infertility.
|Virus||Common name||Major target||Diseases||Clinical syndromes||Site of latency|
Herpes simplex virus‐1
|Mucoepithelial||Oral herpes, genital herpes||Oral and genital herpes, gingivostomatitis, keratoconjunctivitis, encephalitis,|
pneumonitis, esophagitis, hepatitis
|Sensory and cranial nerve ganglia|
Herpes simplex virus‐2
|Same as above||same as above||Oral and genital herpes herpes,|
gingivostomatitis, keratoconjunctivitis, meningitis, encephalitis, pneumonitis,
|Same as above|
Varicella zoster virus
|Same as above||Chickenpox, shingles||Shingles (extradermatomal), pneumonitis,|
disseminated infection, hepatitis, retinitis, meningitis, hemolysis, leukopenia, thrombocytopenia
|Same as above|
|B cells and epithelial cells||Infectious mononucleosis,|
Burkitt’s lymphoma, CNS lymphoma, posttransplant lymphoproliferative syndrome (PTLD), nasopharyngeal carcinoma, HIV‐associated hairy leukoplakia
|Mononucleosis, posttransplant lymphoproliferative disorders, pneumonitis, hepatitis, encephalitis, hemolysis, leukopenia, thrombocytopenia||Memory B cells|
|Monocyte, lymphocyte and epithelial cells||Infectious mononucleosis‐like syndrome, retinitis||Lymphadenopathy, hepatitis, pneumonitis,|
encephalitis, retinitis, esophagitis, hemolysis, leukopenia, thrombocytopenia
|Monocytes, macrophages, lymphocytes, others|
|HHV‐6A/Bβ||T cells, NK cell, epithelial cells|
|HHV‐6A: multiple sclerosis, encephalitis, glioma|
HHV‐6B: sixth disease (roseola infantum or exanthem subitum), multiple sclerosis, encephalitism,
hepatitis, pneumonitis, glioma
|HHV‐6A: meningoencephalitis, encephalitis, perceptual‐motor dysfunction, hemiplegia, lymphoproliferative disorder|
HHV‐6B: rash, fever, meningoencephalitis, encephalitis, perceptual‐motor dysfunction, hemiplegia, lymphoproliferative disorder, pneumonitis, hepatitis, thrombocytopenia, leukopenia,
|T, B, NK cells, monocytes, macrophages, liver, salivary endothelial, neuronal cells|
|HHV‐7γ||T cells||Sixth disease (roseola infantum or exanthem subitum), pityriasis rosea||Rash, fever,|
|CD4+ T cells, salivary epithelial, lung, skin cells|
Kaposi’s sarcoma‐associated herpesvirus
|Lymphocyte and others||Kaposi’s sarcoma, primary effusion lymphoma, some types of multicentric Castleman’s disease||Fever, mononucleosis,|
skin lesions, encephalitis?
2. HHVs infection and male human infertility
Human infertility is a widespread problem that has been increasing in recent decades. It affects 20–30% of couples in the world , and 40–50% is attributed to male infertility [15, 16]. Many risk factors can disrupt male reproductive capacity and cause infertility. Among these are infections with pathogens , such as viruses , mycoplasma , chlamydia , and bacteria .
Recently, a number of studies have detected HHVs in the semen and/or spermatozoa of ∼90% of infertile male patients, although regional variations must be taken into account (Table 2) [6, 9–11, 21–31]. Many investigators have tried to confirm the relationship between male infertility and HHVs infection by combining viral infection rates with statistical analysis of semen and/or sperm samples derived from PCR‐based viral DNA analysis, antigen‐antibody reaction, and immunocytochemistry of spermatozoa. However, only in a few cases, a significant difference in sperm counts, motility, and/or abnormality has been found between HHVs carriers and non‐carriers [6, 9, 11, 27].
Although many studies have revealed a high prevalence of HHVs in male infertility patients, it is still difficult to conclude that HHVs infection is the causative agent. To address this issue, the capacity of HHVs to infect the testis and interfere with spermatogenesis should be proven regardless of the presence or absence of HHVs in the semen and spermatozoa. This would require direct evidence of a molecular mechanism for HHV‐induced infertility. In this respect, studies in Tg animal models offer the opportunity to better understand human male infertility.
|Country or area (year)||Carrier% (carrier/subject)||HHV‐1||HHV‐2||HHV‐3||HHV‐4||HHV‐5||HHV‐6A/B||HHV‐7||HHV‐8|
|Italian (1999) ||91||–||–||–||–||–||–||–||91|
|Germany (2001) ||17.1||3.2||0||7.1||3.6||4||0.4**||0|
|Athens (2003) ||56.6||49.5*||–||16.8||7.1||–||–||–|
|UK (2006) ||3||3|
|USA (2007) ||18.7||3.7||–||0.4||8.7||3.7||–||–|
|Coast (2007) ||14.3||14.3|
|Greece (2009) ||–||2.1||–||3.2*||39.1||56.5||66.3||0||–|
|Germany (2009) ||6.5||6.5|
|Russia (2011) ||11||–||–||–||–||11||–||–||–|
|Spain (2012) ||54||29||–||45||43||8.2||3.6||–|
|Denmark (2012) ||27.8||0.4||0.1||0||6.3||2.7||13.5||4.2||0|
|China (2013) ||38.5||25.4||–||–||3.9||21.6||1.9||–||–|
|Iran (2013) ||22.9||22.9*||14.3||–||–||–||–||–||–|
|France (2015) ||1.7||–||–||–||–||–||1.7||–||–|
|Russia (2014) ||17.7||–||–||–||3.4||5.2*||6.5||–||–|
3. HHV‐1‐TK as a reporter system
TK (EC 126.96.36.199) is a key enzyme in the pyrimidine salvage pathway that catalyzes the transfer of the ATP γ‐phosphate to thymidine to produce dTMP. HHV‐1‐TK is a phosphotransferase specifically required for viral DNA synthesis. HHV‐1‐TK shows broad substrate specificity, including pyrimidines (thymidine, deoxycytidine) and their analogs (azidothymidine), as well as purines (guanosine) and their analogs (acyclovir, ganciclovir [GCV], buciclovir and penciclovir). The ability to transform synthetic precursors, such as GCV, into toxic nucleotide analogs has resulted in effective cancer therapy agents [32, 33]. GCV consists of a guanine linked to an acyclic sugar moiety at position 3’. HHV‐1‐TK converts GCV into GCV‐monophosphate, which is further phosphorylated into GCV‐triphosphate by the host's kinases. GCV‐triphosphate has high affinity for DNA polymerase and functions as a competitive inhibitor of guanosine triphosphate (dGTP), becoming incorporated into the nascent DNA strand (Figure 2). GCV causes a distortion in the DNA sugar phosphate backbone, which blocks DNA replication [34–36] and induces cell apoptosis, thus selectively eliminating HHV‐1‐TK‐positive cells [37, 38]. Moreover, HHV‐1‐TK‐expressing cells trigger apoptosis of neighboring cells due to the transfer of GCV‐triphosphate via gap junctions in a phenomenon called “bystander killing” . Therefore, HHV‐1‐TK can be used as a marker/reporter gene for removing specific target cells.
4. Infertility in HHV‐1‐TK in Tg animals
4.1. Ectopic expression of HHV‐1‐TK
The use of HHV‐1‐TK offers a valuable tool for the ablation of specific cell types as well as in gene therapy. In the early 1990s, Tg rats were engineered to express HHV‐1‐TK under the control of the FSHβ promoter (Figure 3A) in the anterior lobe of the pituitary gland . However, the experiment was interrupted due to observed infertility of male rats. The same happened with Tg mice . Moreover, Ellison and Bishop showed that ectopic expression of HHV‐1‐TK fused to the human immunodeficiency virus long terminal repeat (HIV‐1‐LTR) gene caused male infertility in Tg mice . In the present work, we observed ectopic expression of HHV‐1‐TK gene in the testis of Tg rats (Figure 3B).
Whereas the testes of 3‐month‐old normal rats exhibited morphologically normal germ cells through all stages of maturation, histological analysis of Tg rats revealed developmentally arrested spermatozoa and multinuclear cells, together with altered elongated spermatozoa (Figure 4) . Loss of sperm motility and viability was also observed (Figure 4F). Compared with normal rats, testis and epididymis weights were also decreased by 35 and 57%, respectively. In contrast, prostate and seminal vesicles weights were similar .
4.2. Disruption of spermatogenesis
Histological analysis revealed that in Tg rats abnormal spermatogenesis could be observed as early as 3 months in development. Although spermatocytogenesis and meiosis seemed to progress normally (Figure 5B), the number of spermatozoa in the epididymis decreased dramatically (Figure 5F). Furthermore, large numbers of degenerated germ cells and immature/malformed spermatozoa were present (Figure 5F), indicating that maturation was likely to be disrupted. Degenerated germ cells with large vacuoles and cells lost throughout the tubules were observed in the testis of 6‐month‐old Tg rats (Figure 5C). In 12‐month‐old Tg rats there was a complete loss of germ cells and only Sertoli cells remained in the tubules (Figure 5D). In the epididymis of 6‐ and 12‐month‐old Tg rats, spermatozoa could hardly be observed (Figure 5G–H). Thus, Tg rats showed a spermatid‐stage‐specific defect in maturation and an age‐dependent loss of germ cells.
4.3. HHV‐1‐TK accumulation increases the number of apoptotic germ cells
Whereas spermatocytogenesis and meiosis were confirmed in Tg rats, degeneration of germ cells by necrosis and apoptosis was frequently observed in the seminiferous tubules. In addition, terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay showed a stage‐independent increase in TUNEL‐positive tubules and cells (Figure 6).
4.4. HHV‐1‐TK accumulation in postmeiotic spermatids
Tg rat testes (3‐ and 6‐month‐old) were simultaneously stained with anti‐HHV‐1‐TK and nuclear DAPI stain (Figure 7). We observed that HHV‐1‐TK protein accumulated in the cytoplasm of postmeiotic spermatids while it was absent from spermatogonia, spermatocytes, Leydig cells and Sertoli cells. Furthermore, germ cells were obviously reduced in 6‐month‐old Tg rat testes (Figure 7B-C).
5. Mechanism of ectopic expression of HHV‐1‐TK
Ectopic expression of HHV‐1‐TK protein was confirmed in postmeiotic spermatids by immunohistochemistry. This suggested the existence of alternative promoters directing specific and ectopic expression in postmeiotic spermatids. Western blot analysis of HHV‐1‐TK in Tg rat testis revealed for the first time two bands at 37 and 39 kDa, corresponding to truncated products of the full‐size 43 kDa HHV‐1‐TK protein (Figure 8A) .
Analysis of the transcription start site by RNA ligase‐mediated rapid amplification of cDNA ends (5’‐RLM RACE) (Figure 8B) showed that the start site corresponded to the first intron of the HHV‐1‐TK gene (Figure 8C). This suggested that the second in frame ATG might have produced the 37 kDa band. Ellison and Bishop reported that HIV‐1‐LTR‐driven HHV‐1‐TK ectopic expression was abolished by deleting the region between the multiple cloning site and the second ATG . They suggested that removing this portion conferred DNA methylation‐independent expression in the testis. Indeed, the corresponding region (144 bases) is GC‐rich (67%) and contains 17 CpG sites. Currently, a HHV‐1‐TK vector free of the GC‐rich region is available.
Ectopic, testis‐specific, expression of HHV‐1‐TK in Tg rats and mice raises the possibility that the same mechanism could also affect humans carrying HHV‐1. Therefore, the transcriptional regulation exhibited by ectopic expression of HHV‐1‐TK in Tg rats and the effects of HHV‐1‐TK accumulation on spermatogenesis may be revelatory of the same mechanisms in humans.
6. HHV‐1‐TK accumulation disrupts spermatogenesis and causes male infertility
6.1. Ultrastructural abnormalities of spermatozoa in Tg rat testis
Scanning electron microscopy revealed abnormal ultrastructure of epididymal spermatozoa in 10‐week‐old Tg rats . We observed that the head and tail regions of spermatozoa from 10‐week‐old normal rats exhibited smooth surface and a regular morphological conformation (Figure 9A). Indeed, the morphology of these spermatozoa was different from those of Tg rats (Figure 9B–F). Spermatozoa with malformed heads, the consequence of a defective acrosome or reduced genome, were observed at high frequency among Tg rats (Figure 9B–F). Transmission electron microscopy (TEM) revealed that the cell membrane was missing from segments of the head (Figure 9C), midpiece (Figure 9D), and flagellum (Figure 9F). There were spermatozoa with looped tails (Figure 9D).
TEM of 3‐month‐old rat testis showed that in contrast with normal rats (Figure 10A–C), Tg rats displayed massive vacuoles within the seminiferous epithelium (Figure 10D–E, asterisks). These frequently presented degenerated spermatocytes in the seminiferous tubules (Figure 10E–F, arrowheads), in spite of confirmed spermatocytogenesis and meiosis. Moreover, TEM also showed elongated spermatids with disorganized heads partially devoid of cell membrane (Figure 10G, arrowhead), multiple flagella (Figure 10H, arrow), and absence of the inner arms of flagellar axonemes (Figure 10I, arrowheads) in the lumen of seminiferous tubules. In addition, vacuolization was also observed in the cytoplasm of spermatocytes (Figure 10F).
TEM also revealed the low number of spermatozoa in the epididymis of Tg rats (Figure 11B) as compared to normal rats (Figure 11A). Spermatozoa from normal rats displayed intact cell membranes and normal‐shaped heads with complete chromatin condensation (Figure 11A1). Instead, those of Tg rats presented a number of defects: several immature spermatids detaching from Sertoli cells and sloughing into the epididymis (Figure 11B), degenerated round spermatids (Figure 11B1) and many types of abnormal elongated spermatids (Figure 11B2–B4). In addition, whereas normal rats presented the typically assembled flagellar axonemes composed of nine outer doublet microtubules and a pair of central microtubules (Figure 11A2), most spermatozoa from Tg rats were dead and showed various ultrastructural defects, including breakage of the surface membrane (Figure 11B5) and a decline in the number of outer dense fibers (Figure 11B6).
6.2. Disruption of Sertoli‐germ junctions
Hematoxylin and eosin staining revealed various abnormal morphologies in Tg rat testis. Cytoplasmic vacuolation of Sertoli cells (Figure 12A, open arrowhead), disconnection between Sertoli and germ cells (Figure 12B, arrows), and disordered arrangement of elongated spermatids (Figure 12C, arrowhead) were present in many seminiferous tubules. In addition, immature spermatozoa falling off from the seminiferous epithelium were observed during all stages of spermatogenesis (Figure 12D–H, arrowheads). Furthermore, sperm development was disrupted and germ cells with different levels of maturity were observed simultaneously (Figure 12D–H). These results indicate that cell junctions between germ and Sertoli cells may have been affected. This hypothesis may be confirmed by analyzing gene expression profiles of Tg rat testis.
7. Alterations in gene expression profiles of Tg rat testis
Changes in gene expression evoked by HHV‐1‐TK accumulation in Tg rat testis were examined by cDNA microarray analysis. We found that 200 genes, 0.67% of all transcripts on DNA chips, were differently expressed between Tg and normal rats. We sorted the genes by their functional categories, such as apoptosis, cell cycle, development, oxidative stress, proteolysis, signal transduction, transcription, translation, transport, metabolism, immune response, and cell adhesion. The highest number of affected genes was linked to metabolism, with 8 genes up‐regulated and 16 down‐regulated by at least 1.5‐fold in Tg rat testis (Table 3) .
RT‐PCR was performed for 10 genes involved in cell adhesion, signal transduction, and transport:
|Biological process||Gene number of expression changed|
Notably, the contraceptive adjudin has been reported to induce morphological alterations in the seminiferous tubules similar to the ones we observed here, and target directly testin and actin‐myosin . However, the exact mechanism by which HHV‐1‐TK disrupts spermatogenesis and adherens junctions will require further work.
|Gene product||Microarray analysis||Real‐time PCR results|
|Gene title||Gene symbol||Category||Ratio of TG value/N value||Expression levels TG/N|
|Up‐regulated genes in TG rat testes|
|CCR4‐NOT transcription complex,|
|Fibroblast growth factor 7||Fgf7||Development||6.10||2.00||<0.05|
|EGF‐like‐domain, multiple 6||Egfl6||Cell adhesion||3.70||0.91||NS|
|Testin gene||Testin||Cell adhesion||2.30||2.00||<0.05|
|Osteoclast stimulating factor 1||Ostf1||Transcription||1.68||1.30||<0.05|
|ATPase, Ca2+ transporting, cardiac|
muscle, slow twitch 2
|SH3‐domain binding protein 4||Sh3bp4||Transport||0.06||0.91||NS|
|Lamimin, gamma 2||Lamc2||Cell adhesion||0.09||0.90||NS|
|Chondroitin sulfate proteoglycan 2||Versican||Cell adhesion||0.10||0.55||<0.05|
|MAM domain containing glycosylphosphatidylinositol anchor 2||Mamdc1||Cell adhesion||0.62||0.67||<0.05|
|Gene name||Gene symbol||Category||Molecular function||Biological process|
|Up‐regulated genes in TG rat testes|
|CCR4‐NOT transcription complex, subunit 7||Cnot7||Signal transduction||Has 3‐5 poly(A) exoribonuclease activity, nucleic acid binding, transcription factor activity, catalytic component of the CCR4‐NOT complex, cell proliferation factor,|
mRNA degradation, miRNA‐mediated repression
|spermatogenesis, tumor cell metastasis suppressor, bone metabolism, embryonic development, tumor suppressor|
|Fibroblast growth factor 7||Fgf7||Development||chemoattractant activity, growth factor activity, mitogenic and cell|
survival activities activation of MAPKK activity actin
cytoskeleton reorganization neurotrophin TRK
receptor signaling pathway
|embryonic development, cell growth, morphogenesis, tissue repair, tumor growth and invasion|
|Testin gene||Testin||Cell adhesion||regulation of cell|
motility, poly(A) RNA binding,
zinc ion binding
|cell adhesion, cell spreading, reorganization of the actin cytoskeleton, negative regulation of cell proliferation, tumor suppressor|
|Osteoclast stimulating factor 1||Ostf1||Transport||SH3 domain binding||induces bone resorption, enhancing osteoclast formation|
|Chondroitin sulfate proteoglycan 2||Versican||Cell adhesion||interaction of integrins, anti‐cell adhesion, regulation of cell|
motility, growth and
differentiation, a key
factor in inflammation hyaluronic acid binding,
embryonic cell migration
important in the
the heart, neural
crest cell migration,
inhibit nervous system
growth, tumor growth
|MAM domain containing glycosyphosphatidylinositol anchor 2||Mamdc1||Cell adhesion||GPI‐anchored protein,|
8. HHV‐1‐TK in human testis
Nested PCR for 4 types of HHVs was performed on 153 DNA samples prepared from human semen (Figure 13). Bands of 99, 150, 165, and 135 bp were observed for HHV‐1, HHV‐4, HHV‐5, and HHV‐6A/B (HHV‐6A and 6B were detected together by common domains), respectively (Figure 13A). Samples showing positive bands by more than one PCR target indicated concomitant infection with multiple types of HHVs (Figure 13A). We identified nucleotide sequences corresponding to HHV‐1, HHV‐4, HHV‐5, and HHV‐6A/B (Figure 13B) in 39, 6, 33, and 3 patients, respectively, as summarized in Table 6. We observed double infection with HHV‐1/HHV‐5 (15 carriers), HHV‐1/HHV‐4 (1), HHV‐1/HHV‐6A/B (2) and HHV‐4/HHV‐5 (4). HHV‐4 carriers presented a double infection 83% of the time, while for other HHVs it ranged from 46 to 66%.
|Number of virus infection in patients (153)|
|Total||39 (25%)||6 (4%)||33 (22%)||3 (2%)|
|Number of double virus infection|
|Total||18/39 (46%)||5/6 (83%)||19/33 (58%)||2/3 (66%)|
The viral DNA‐positive group showed a higher incidence of oligozoospermia compared with the viral DNA‐negative group (38.5 vs. 16.7%,
9. Future perspectives
HHV‐1 infection might strongly associate with human male infertility, possibly by testis‐specific expression of the viral TK gene. However, conclusive evidence that HHV‐1‐TK causes male infertility is still missing.
As described above, HHV‐1‐TK is known as a suicide gene that kills target cells specifically in the presence of GCV. However, male infertility normally occurs in the presence of HHV‐1 but absence of GCV. Degeneration of spermatogenesis was observed as early as 3 months in Tg rats ectopically expressing HHV‐1‐TK. With the exception of Sertoli cells, it later resulted in loss of germ cells, possibly by “bystander killing.” In contrast, no abnormality in the pituitary gland of Tg rats was observed. This difference may indicate tissue‐specific action of HHV‐1‐TK in the testis, which does not occur in the pituitary gland. At present, it is unclear why HHV‐1‐TK targets testis over other tissues and how it induces degeneration of spermatogenesis. Further work is required to elucidate this and other features of HHV‐related infertility.
Expression of HHV‐1‐TK may be the main cause of infertility in HHV‐1‐infected human males. To firmly establish a causative link, several players require identification: (1) target molecule(s) of HHV‐1‐TK; (2) the HHV‐1‐TK‐dependent mechanism responsible for failed spermatogenesis; and (3) the mechanism dictating postmeiotic spermatid‐specific expression of HHV‐1‐TK. The identification of target molecule(s) is particularly important, since there is no evidence that enzymatically active HHV‐1‐TK is required, raising speculation it may only serve as a binding protein. Even if HHV‐1‐TK functioned as an enzyme, the substrate(s) might be testis‐specific. Currently, the only known activity of HHV‐1‐TK is to catalyze the transfer of the γ‐phosphate from ATP to substrate nucleotides and analogs. Recently, a stable‐isotope substrate ([γ‐18O4]ATP) for kinases has been developed . Mass spectrometry could reveal the identity of [γ‐18O4]ATP‐labeled products obtained by incubating recombinant HHV‐1‐TK with testis homogenates. The identified HHV‐1‐TK target(s) may help elucidate the mechanisms determining failed spermatogenesis and postmeiotic spermatid‐specific expression of HHV‐1‐TK. Moreover, knowing the target(s) molecular properties may help design appropriate analogs for pharmacological use. The significance of our results is particularly clear in view of expected novel male contraceptives and drugs for HHV‐related male infertility.