Testis-specific Protein Y-encoded Research Articles

PCR amplification, sequencing, and in silico analysis of holandric genes TSPYand SRY in Nili Ravi buffalo

The present work has been designed to study the evolutionary perspectives of two important holandric genes, namely, testis-specific protein, Y-encoded (TSPY), and sex determining region, Y-encoded (SRY) in Nili Ravi buffalo. These Y-chromosomal genes are responsible for male sex development. The evolutionary aspects of these genes have not been studied in the Nili Ravi buffaloes from India. A study was carried out on the peripheral blood samples of three adult Nili Ravi bulls belonging to university farm. DNA was extracted using the phenol-chloroform isoamyl alcohol (PCI) technique and reported primer sequences were used to amplify the genes (partially) using a thermocycler. Three biological samples were analyzed using Sanger sequencing and were aligned using Clustal Omega. Separate phylogenetic trees for the genes were constructed using MEGA7 software. The selection pressure analysis and evolutionary divergence were individually studied for each of the genes. The current study reports the partial TSPY and SRY gene sequences of Indian Nili Ravi buffalo. Besides, the molecular evolution analysis indicates that the genes have experienced some purifying selection during the evolutionary process. Molecular characterization of these holandric genes (TSPY and SRY) in Nili Ravi will find applications in sex determination in Nili Ravi and other buffaloes.

Bilateral Gonadoblastoma in a 13-Year-Old Female with Turner Syndrome and Y Chromosome: A Case Report

Abstract Introduction/Objective Gonadoblastoma is a relatively rare type of ovarian tumor that has a high risk for patients with 45X/46XY. It is derived from the Y chromosome at its long arm GBY region, which contains the most likely candidate gene called testis-specific protein Y-encoded (TSPY). Methods/Case Report In this case report, we present a case of a 13-year-old girl with Turner syndrome whose cytogenetic test showed 45X with monosomy X and a siodicentric Yq chromosome. As she carried a high risk for the development of gonadoblastoma due to the presence of the Y chromosome and clinically had premature ovarian failure, she received further imaging studies, which did not reveal obvious ovarian masses. She underwent resections of bilateral fallopian tubes and ovaries. Bilateral fallopian tubes were unremarkable. However, within the bilateral ovarian tissue, foci of gonadoblastoma were found (0.5 to 0.6 cm), composed of large round germ cells (confirmed by positive OCT 3/4 and SALL4 stains) intermingled with oval-shaped sex cord-stromal cells forming tubular/cribriform structures (confirmed by positive staining for inhibin, calretinin, and FOXL2). The stromal cells of gonadoblastoma, but not germ cells, were positive for androgen receptor staining, while both components were negative for estrogen receptor staining. No invasive germ cell tumor or sex cord tumor was present. Results (if a Case Study enter NA) N/A Conclusion The positive androgen receptor staining in stromal cells of the gonadoblastoma supports the view that the Y chromosome-driven androgen system may play a role in the development of gonadoblastoma in a bi-cellular pattern.

Testis-Specific Protein Y-Encoded (TSPY) Is Required for Male Early Embryo Development in Bos taurus

TSPY is a highly conserved multi-copy gene with copy number variation (CNV) among species, populations, individuals and within families. TSPY has been shown to be involved in male development and fertility. However, information on TSPY in embryonic preimplantation stages is lacking. This study aims to determine whether TSPY CNV plays a role in male early development. Using sex-sorted semen from three different bulls, male embryo groups referred to as 1Y, 2Y and 3Y, were produced by in vitro fertilization (IVF). Developmental competency was assessed by cleavage and blastocyst rates. Embryos at different developmental stages were analyzed for TSPY CN, mRNA and protein levels. Furthermore, TSPY RNA knockdown was performed and embryos were assessed as per above. Development competency was only significantly different at the blastocyst stage, with 3Y being the highest. TSPY CNV and transcripts were detected in the range of 20-75 CN for 1Y, 20-65 CN for 2Y and 20-150 CN for 3Y, with corresponding averages of 30.2 ± 2.5, 33.0 ± 2.4 and 82.3 ± 3.6 copies, respectively. TSPY transcripts exhibited an inverse logarithmic pattern, with 3Y showing significantly higher TSPY. TSPY proteins, detected only in blastocysts, were not significantly different among groups. TSPY knockdown resulted in a significant TSPY depletion (p < 0.05), with no development observed after the eight-cell stage in male embryos, suggesting that TSPY is required for male embryo development.

Testis-specific protein Y-encoded 1 regulates androgen receptor expression through the MAPK/ERK pathway in male hepatocellular carcinoma.

To analyze the mechanism of testis-specific protein Y-encoded 1 (TSPY1) in male hepatocellular carcinoma (HCC). This experimental study was carried out at Guangxi Medical University's First Affiliated Hospital, Guangxi, China, between January 2016 and December 2019. The expression of TSPY1, androgen receptor (AR), messenger ribonucleic acids (mRNAs), and proteins were detected by qRT-PCR and Western blotting. The co-localization and interaction of TSPY1 and AR were observed by immunofluorescence assay and co-immunoprecipitation. Hepatocellular carcinoma cells overexpressing and silencing TSPY1 were constructed, and the expression and phosphorylation levels of TSPY1, AR, and mitogen-activated protein kinases/extracellular signal-regulated kinases (MAPK/ERK) signaling pathway-related key molecules ERK1/2, p38, and JNK were also detected. The expression levels of TSPY1, AR mRNAs, and proteins were highly positively correlated in HCC cells in different metastatic potentials with a high correlation coefficient of R=0.929 and R=0.884. Testis-specific protein Y-encoded 1 and AR were then co-localized in the nucleus of HCC cells, and TSPY1 and AR can interact with each other. In addition, the expression of AR and phosphorylation of ERK1/2 were enhanced in TSPY1 overexpressed Huh7 cells. They were reduced in HCCLM3 cells with TSPY1 knockdown expression. In addition, in response to blocking MAPK/ERK signaling activity, AR was reduced in expression. These findings suggested that there was a positive correlation between TSPY1 expression and AR in male HCC cells, and high TSPY1 expression stimulates AR expression, MAPK/ERK signaling pathway may be involved in its mechanism.

Identification of Genetic Variants in Y-Chromosome Specific Genes Associated with Seminal Production in Murrah Buffaloes

Background: Marker assisted selection based strategies are essential to identify superior quality bulls at an early age for frozen semen production. The present study aims to determine the genetic variants in the Y-chromosome specific genes, sex determining region on Y-chromosome (SRY) and testis specific protein Y-encoded (TSPY) in association with semen production traits in Murrah buffalo bulls. Methods: The genomic DNA extracted from the blood samples of 70 Murrah buffalo bulls maintained under semen production in the frozen semen station were utilized for PCR amplification. The sequences of SRY and TSPY genes were screened for single nucleotide polymorphism using the seqman module of DNASTAR LASERGENE software. The single nucleotide variations in comparison with reference sequences and phylogenetic tree construct were obtained using Clustal W and MegAlign module. Result: The analysis revealed that the sequences of SRY and TSPY genes were monomorphic in nature, devoid of variations specifying that the sequences are highly conserved among the Murrah buffalo bulls studied. Hence, association studies with seminal traits could not be performed. However, the exon sequence of SRY gene of Murrah buffalo showed a single nucleotide variation at position 209 (G less than A) compared to the sequences of Nili-Ravi and Kundi buffaloes. Similarly, the TSPY gene exhibited a significant number of single nucleotide variations compared with Bos taurus sequences. The phylogenetic tree analysis evinced a close genetic relationship with less divergence between Murrah buffalo and other buffalo breeds and species in the bovinae family. Further extensive studies on SRY, TSPY and other Y-chromosome specific genes in a large, diverse population of Murrah buffalo bulls could help to discover a considerable number of SNP markers related to semen production for the early selection of breeding bulls.

Novel Mutations of TSPY1 Gene Associate Spermatogenic Failure Among Men.

Etiology of male infertility is intriguing owing to complex genetic regulation of human spermatogenesis and ethnic variations in genetic architecture of human populations. The present study characterizes the role of Y chromosome specific spermatogenic regulator testis-specific protein Y-encoded 1 (TSPY1) gene mutation in spermatogenic failure. This case-control study includes 163 cases of spermatogenic failure and 175 age-matched fertile men as controls. We found five novel base substitutions, namely, MT162695, MN879413, MN889982, MN889983, MN719943, two deletions MN734578 and MN734579, three novel insertions MN719941, MN719942 and MN719944 through Sanger's dideoxy sequencing of TSPY1 gene reading frame. All these mutations exhibited strong association with male infertility. In silico analyses suggest prospective disruption in splice sites and alteration in different isoforms of TSPY1 transcripts and amino acid sequence in TSPY1 protein. The study provides novel evidence in favour of implication of TSPY1 gene in male fertility. The outcome sheds light to get insight into the issue of idiopathic male infertility in Bengali population.

Gonadoblastoma: origin and outcome

Classical gonadoblastoma occurs almost entirely in the dysgenetic gonads of an individual who has a disorder of sex development; however, a small number of cases arise in individuals with a normal peripheral karyotype and no evidence of a disorder of sex development. Those gonadoblastomas that occur in an individual who has a Y chromosome or part thereof express testis specific protein Y-encoded 1 (TSPY1). If a gonad in those individuals contains germ cells with delayed maturation and also harbors the TSPY1 gene, the cells can undergo transformation to classical gonadoblastoma. The latter consists of rounded islands composed of germ cells, sex cord elements, and hyaline basement membrane material surrounded by a variably cellular stroma that sometimes contains steroid cells. Classical gonadoblastoma can be interpreted as a noninvasive or an in situ neoplasm that is the precursor of germinoma in some individuals and, indirectly, of other more aggressive germ cell neoplasms. The "dissecting" variant is derived from classical gonadoblastoma and is characterized by unusual growth patterns. Undifferentiated gonadal tissue is the precursor of gonadoblastoma; however, if all germ cells in an individual with undifferentiated gonadal tissue involute, the result is a secondary streak gonad. Undifferentiated gonadal tissue is a non-neoplastic condition resembling a streak gonad but additionally contains germ cells with delayed maturation that express octamer-binding transcription factor 4; however, other germ cells, show normal maturation and express TSPY1.

Battle of the sexes: contrasting roles of testis-specific protein Y-encoded (TSPY) and TSPX in human oncogenesis.

The Y-located testis-specific protein Y-encoded (TSPY) and its X-homologue TSPX originated from the same ancestral gene, but act as a proto-oncogene and a tumor suppressor gene, respectively. TSPY has specialized in male-specific functions, while TSPX has assumed the functions of the ancestral gene. Both TSPY and TSPX harbor a conserved SET/NAP domain, but are divergent at flanking structures. Specifically, TSPX contains a C-terminal acidic domain, absent in TSPY. They possess contrasting properties, in which TSPY and TSPX, respectively, accelerate and arrest cell proliferation, stimulate and inhibit cyclin B-CDK1 phosphorylation activities, have no effect and promote proteosomal degradation of the viral HBx oncoprotein, and exacerbate and repress androgen receptor (AR) and constitutively active AR variant, such as AR-V7, gene transactivation. The inhibitory domain has been mapped to the carboxyl acidic domain in TSPX, truncation of which results in an abbreviated TSPX exerting positive actions as TSPY. Transposition of the acidic domain to the C-terminus of TSPY results in an inhibitory protein as intact TSPX. Hence, genomic mutations/aberrant splicing events could generate TSPX proteins with truncated acidic domain and oncogenic properties as those for TSPY. Further, TSPY is upregulated by AR and AR-V7 in ligand-dependent and ligand-independent manners, respectively, suggesting the existence of a positive feedback loop between a Y-located proto-oncogene and male sex hormone/receptors, thereby amplifying the respective male oncogenic actions in human cancers and diseases. TSPX counteracts such positive feedback loop. Hence, TSPY and TSPX are homologues on the sex chromosomes that function at the two extremes of the human oncogenic spectrum.

Classical gonadoblastoma: its relationship to the ‘dissecting’ variant and undifferentiated gonadal tissue

Classical gonadoblastoma occurs almost entirely in the dysgenetic gonads of an individual who has a disorder of sex development. Approximately 40% of such neoplasms are bilateral. Almost all gonadoblastomas occur in patients who have a Y chromosome or part thereof; testis-specific protein Y-encoded 1 (TSPY1) is the putative gene. If a gonad in a patient who has a disorder of sex development contains germ cells with delayed maturation, and also harbours the TSPY1 gene, the cells can undergo transformation to classical gonadoblastoma. The latter consists of rounded islands composed of germ cells, sex cord elements and hyaline basement membrane material surrounded by a variably cellular gonadal stroma that sometimes contains steroid cells. Classical gonadoblastoma can be interpreted as a non-invasive neoplasm that is the precursor of germinoma and, indirectly, other more aggressive germ cell neoplasms. Undifferentiated gonadal tissue is the precursor of classical gonadoblastoma and contains germ cells with delayed maturation that express octamer-binding transcription factor 4 (OCT4); however, other germ cells show normal maturation and express TSPY1. If all germ cells in a patient with undifferentiated gonadal tissue involute, the result is a secondary streak. Undifferentiated gonadal tissue is a non-neoplastic condition that should be distinguished clearly from 'dissecting gonadoblastoma', a neoplasm derived from classical gonadoblastoma that is the precursor of some germinomas. 'Dissecting gonadoblastoma' is a variant of classical gonadoblastoma that has unusual growth patterns and contains both sex cord and germ cell elements. Clonal expansion of germ cells is a characteristic of the late stage of 'dissecting gonadoblastoma'.

The Y-located proto-oncogene TSPY exacerbates and its X-homologue TSPX inhibits transactivation functions of androgen receptor and its constitutively active variants

The gonadoblastoma gene, testis-specific protein Y-encoded (TSPY), on the Y chromosome and its X-homologue, TSPX, are cell cycle regulators and function as a proto-oncogene and a tumor suppressor respectively in human oncogenesis. TSPY and TSPX competitively bind to the androgen receptor (AR) and AR variants, such as AR-V7, at their conserved SET/NAP domain, and exacerbate and repress the transactivation of the AR/AR-V7 target genes in ligand dependent and independent manners respectively. The inhibitory domain has been mapped to the carboxyl acidic domain of TSPX, truncation of which renders TSPX to be stimulatory while its transposition to the C-terminus of TSPY results in an inhibitory hybrid protein. TSPY and TSPX co-localize with the endogenous AR, in the presence of ligand, on the promoters and differentially regulate the expression of the endogenous AR target genes in the androgen-responsive LNCaP prostate cancer cells. Transcriptome analysis shows that TSPY and TSPX expressions differentially affect significant numbers of canonical pathways, upstream regulators and cellular functions. Significantly, among the common ones, TSPY activates and TSPX inhibits numerous growth-related and oncogenic canonical pathways and cellular functions in the respective cell populations. Hence, TSPY and TSPX exert opposing effects on the transactivation functions of AR and AR-Vs important for various physiological and disease processes sensitive to male sex hormone actions, thereby not only affecting the pathogenesis of male-specific prostate cancer but also likely contributing to sex differences in the health and diseases of man.

Identification of a TSPY co-expression network associated with DNA hypomethylation and tumor gene expression in somatic cancers

Testis specific protein Y-encoded (TSPY) is a Y-located proto-oncogene predominantly expressed in normal male germ cells and various types of germ cell tumor. Significantly, TSPY is frequently expressed in somatic cancers including liver cancer but not in adjacent normal tissues, suggesting that ectopic TSPY expression could be associated with oncogenesis in non-germ cell cancers. Various studies demonstrated that TSPY expression promotes growth and proliferation in cancer cells; however, its relationship to other oncogenic events in TSPY-positive cancers remains unknown. The present study seeks to correlate TSPY expression with other molecular features in clinical cancer samples, by analyses of RNA-seq transcriptome and DNA methylation data in the Cancer Genome Atlas (TCGA) database. A total of 53 genes, including oncogenic lineage protein 28 homolog B (LIN28B) gene and RNA-binding motif protein Y-linked (RBMY) gene, are identified to be consistently co-expressed with TSPY, and have been collectively designated as the TSPY co-expression network (TCN). TCN genes were simultaneously activated in subsets of liver hepatocellular carcinoma (30%) and lung adenocarcinoma (10%) regardless of pathological stage, but only minimally in other cancer types. Further analysis revealed that the DNA methylation level was globally lower in the TCN-active than TCN-silent cancers. The specific expression and methylation patterns of TCN genes suggest that they could be useful as biomarkers for the diagnosis, prognosis and clinical management of cancers, especially those for liver and lung cancers, associated with TSPY co-expression network genes.

The Porcine TSPY Gene Is Tricopy but Not a Copy Number Variant.

The testis-specific protein Y-encoded (TSPY) gene is situated on the mammalian Y-chromosome and exhibits some remarkable biological characteristics. It has the highest known copy number (CN) of all protein coding genes in the human and bovine genomes (up to 74 and 200, respectively) and also shows high individual variability. Although the biological function of TSPY has not yet been elucidated, its specific expression in the testis and several identified binding domains within the protein suggests roles in male reproduction. Here we describe the porcine TSPY, as a multicopy gene with three copies located on the short arm of the Y-chromosome with no variation at three exon loci among 20 animals of normal reproductive health from four breeds of domestic pigs (Piétrain, Landrace, Duroc and Yorkshire). To further investigate the speculation that porcine TSPY is not a copy number variant, we have included five Low-fertility boars and five boars with exceptional High-fertility records. Interestingly, there was no difference between the High- and Low-fertile groups, but we detected slightly lower TSPY CN at all three exons (2.56-2.85) in both groups, as compared to normal animals, which could be attributed to technical variability or somatic mosaicism. The results are based on both relative quantitative real-time PCR (qPCR) and droplet digital PCR (ddPCR). Chromosomal localization of the porcine TSPY was done using fluorescence in situ hybridization (FISH) with gene specific PCR probes.

Molecular docking uncovers TSPY binds more efficiently with eEF1A2 compared to eEF1A1

Testis-specific protein, Y-encoded (TSPY) binds to eukaryotic translation elongation factor 1 alpha (eEF1A) at its SET/NAP domain that is essential for the elongation during protein synthesis implicated with normal spermatogenesis. The eEF1A exists in two forms, eEF1A1 (alpha 1) and eEF1A2 (alpha 2), encoded by separate loci. Despite critical interplay of the TSPY and eEF1A proteins, literature remained silent on the residues playing significant roles during such interactions. We deduced 3D structures of TSPY and eEF1A variants by comparative modeling (Modeller 9.13) and assessed protein–protein interactions employing HADDOCK docking. Pairwise alignment using EMBOSS Needle for eEF1A1 and eEF1A2 proteins revealed high degree (~92%) of homology. Efficient binding of TSPY with eEF1A2 as compared to eEF1A1 was observed, in spite of the occurrence of significant structural similarities between the two variants. We also detected strong interactions of domain III followed by domains II and I of both eEF1A variants with TSPY. In the process, seven interacting residues of TSPY’s NAP domain namely, Asp 175, Glu 176, Asp 179, Tyr 183, Asp 240, Glu 244, and Tyr 246 common to both eEF1A variants were detected. Additionally, six lysine residues observed in eEF1A2 suggest their possible role in TSPY–eEF1A2 complex formation essential for germ cell development and spermatogenesis. Thus, more efficient binding of TSPY with eEF1A2 as compared to that of eEF1A1 established autonomous functioning of these two variants. Studies on mutated protein following similar approach would uncover the causative obstruction, between the interacting partners leading to deeper understanding on the structure–function relationship.

The Y-located gonadoblastoma gene TSPY amplifies its own expression through a positive feedback loop in prostate cancer cells

The testis-specific protein Y-encoded (TSPY) is a repetitive gene located on the gonadoblastoma region of the Y chromosome, and has been considered to be the putative gene for this oncogenic locus on the male-only chromosome. It is expressed in spermatogonial cells and spermatocytes in normal human testis, but abundantly in gonadoblastoma, testicular germ cell tumors and a variety of somatic cancers, including melanoma, hepatocellular carcinoma and prostate cancer. Various studies suggest that TSPY accelerates cell proliferation and growth, and promotes tumorigenesis. In this report, we show that TSPY could bind directly to the chromatin/DNA at exon 1 of its own gene, and greatly enhance the transcriptional activities of the endogenous gene in the LNCaP prostate cancer cells. Domain mapping analyses of TSPY have localized the critical and sufficient domain to the SET/NAP-domain. These results suggest that TSPY could efficiently amplify its expression and oncogenic functions through a positive feedback loop, and contribute to the overall tumorigenic processes when it is expressed in various human cancers.

Over-Expressed Testis-Specific Protein Y-Encoded 1 as a Novel Biomarker for Male Hepatocellular Carcinoma

Hepatocellular carcinoma (HCC) is a male-predominant cancer. Previous studies have focused on the sex-related disparity in HCC, but the underlying mechanism remains unclear. Here, we aimed to discover characteristic biomarkers for male HCC. Clinical samples were subjected to iTRAQ labeling followed by 2DLC-ESI-MS/MS analysis. Seventy-three differential proteins containing 16 up-regulated and 57 down-regulated proteins were screened out in the male HCC group compared to that in female HCC group. Testis-specific Protein Y-encoded 1(TSPY1) is characteristically present in male HCC and was chosen for further investigation. The data from the functional effects of TSPY1 indicated that over-expression of TSPY1 could potentiate HCC cell proliferation, increase soft agar colonization, induce higher cell invasive ability and correlate with the metastatic potential of the HCC cell lines. In addition, TSPY1 and androgen receptor (AR) were co-expressed simultaneously in HCC cell lines as well as in HCC tissue. TSPY1 up- or down-regulation could lead to a high or low level expression of AR. These results implied that TSPY1 may be included in the regulation of AR expression involved in male HCC and it may act as a novel biomarker for male HCC.

A significant effect of the TSPY1 copy number on spermatogenesis efficiency and the phenotypic expression of the gr/gr deletion

AZFc deletions cause a significant phenotypic heterogeneity with respect to spermatogenesis; however, the reason for this is poorly understood. Recently, testis-specific protein Y-encoded 1 (TSPY1) copy number variation (CNV) was determined to be a potential genetic modifier of spermatogenesis. We performed a large-scale cohort study to investigate the effect of TSPY1 CNV on spermatogenesis and to elucidate the possible contribution of TSPY1 genetic variation to the phenotypic expression of AZFc deletions. Haplogrouping of the Y-chromosome and quantification of the TSPY1 copy number were performed in 2272 Han Chinese males with different spermatogenic statuses (704 males with the b2/b4 or gr/gr deletion and 1568 non-AZFc-deleted males). Our data revealed that the TSPY1 copy number distributions were significantly different among non-AZFc-deleted males with different spermatogenic phenotypes. Lower sperm production and an elevated risk of spermatogenic failure were observed in males with fewer than 21 TSPY1 copies and in those with more than 55 copies relative to men with 21-35 copies. Similar results were observed in males with the gr/gr deletion. These findings indicate that TSPY1 CNV affects an individual's susceptibility to spermatogenic failure by modulating the efficiency of spermatogenesis and strongly suggest that there is a significant quantity effect of the TSPY1 copy number on the phenotypic expression of the gr/gr deletion. To our knowledge, this CNV is the first independent genetic factor that has been clearly observed to influence the spermatogenic status of gr/gr deletion carriers. A combined genetic analysis of the TSPY1 copy number and the gr/gr deletion could inform the clinical counselling of infertile couples.

Gonadal malignancy in 13 consecutive collected patients with disorders of sex development (DSD) from Semarang (Indonesia)

AimsCaucasian patients with disorders of sex development (DSD) are at a high risk of developing germ cell cancer (GCC). GCC is prominent in young adults in Western countries, while the...

TSPY4 is a novel sperm-specific biomarker of semen exposure in human cervicovaginal fluids; potential use in HIV prevention and contraception studies

BackgroundDeveloping an objective, reliable method to determine semen exposure in cervicovaginal fluids is important for accurately studying the efficacy of vaginal microbicides and contraceptives. Y-chromosome biomarkers offer better stability, sensitivity, and specificity than protein biomarkers. TSPY4 belongs to the TSPY (testis-specific protein Y-encoded) family of homologous genes on the Y-chromosome. Using a multiplex PCR amplifying TSPY4, amelogenin, and Sex-determining region in the Y chromosome (SRY), our objective was to determine whether a gene in the TSPY family was a more sensitive marker of semen exposure in cervicovaginal fluids than SRY. Study DesignThe multiplex polymerase chain reaction (PCR) was developed using sperm and vaginal epithelial (female) DNA. Diluted sperm DNA and mixed male/female DNA was used to determine the sensitivity of the multiplex PCR. Potential interference of TSPY4 amplification by components in cervicovaginal and seminal fluids was determined. TSPY4 and SRY amplification was also investigated in women participating in a separate IRB-approved clinical study in which cervicovaginal swab DNA was collected before semen exposure and at various time points after exposure. ResultsTSPY4, SRY, and amelogenin were amplified in sperm DNA, but only amelogenin in female DNA. The limit of sperm DNA from which TSPY4 could be amplified was lower than SRY (4 pg vs 80 pg). TSPY4 could also be amplified from mixed male/female DNA. Amplification was not affected by cervicovaginal and seminal components. Using cervicovaginal swab DNA from three women before and after semen exposure, TSPY4 was detected up to 72 h post exposure while SRY detection was observed up to 24–48 h. TSPY4 was detected up to 7 days post exposure in one out of three women. ConclusionsWe have demonstrated that TSPY4 is a new sensitive, and sperm-specific biomarker. The multiplex PCR incorporating this new biomarker has potential to be an objective measure for determining semen exposure in clinical trials of vaginal products such as contraceptives and HIV pre/post-exposure prophylaxis agents.

Testis-Specific Protein Y-Encoded Copy Number Is Correlated to Its Expression and the Field Fertility of Canadian Holstein Bulls

Testis-specific protein Y-encoded (TSPY) is present in varying copy number in both human (20–76 copies) and cattle (37–200 copies), and some studies have linked this variation to semen quality in men. The purpose of this study was to determine if TSPY copy number is associated with fertility in bulls by using adjusted non-return rates, a commonly used measure of field fertility in Canada. In addition, we investigated the associations between TSPY copy number and its expression as well as specific semen parameters, such as average sperm concentration, sperm count, ejaculate volume, and motility. In 2 independent trials, TSPY copy number was shown to be positively correlated to adjusted non-return rates (trial #1: Spearman r = 0.34, p < 0.05; trial #2: Spearman r = 0.77, p < 0.01). Furthermore, TSPY copy number was inversely correlated to TSPY mRNA expression in the testis (Pearson r = –0.71, p < 0.0001). There were no correlations of TSPY copy number or expression with the semen parameters measured. Therefore, TSPY copy number might represent a potential marker of bull fertility, but its mechanism does not appear to be directly related to the semen characteristics analyzed as part of this study.

Mice overexpression of &lt;i&gt;human augmenter of liver regeneration&lt;/i&gt; (hALR) in male germ cells shows abnormal spermatogenesis and reduced fertility

Human augmenter of liver regeneration (hALR) is a sulfhydryl oxidase that is highly expressed in spermatogonia and early spermatocytes. To investigate the physiological effects of hALR in spermatogenesis, we generated a hALR transgenic mouse model driven by the human TSPY (testis-specific protein, Y-encoded) promoter that allows the transgene to be specifically activated in the testes. hALR content was found to be increased in both germ cells. The histological and TUNEL analysis of transgenic testes revealed a number of spermatogenetic defects including primary spermatocyte overpopulation followed by depletion through apoptosis, degenerating and detached nucleated germ cells, haploid cell loss and intraepithelial vacuoles of varying sizes. In line with these features, adult transgenic male mice also displayed a reduction in fertility. Our data suggest that regulated spatial and temporal expression of hALR is required for normal testicular development and spermatogenesis, and overexpression of hALR results in influencing the sperm morphology and quantity and the eventual reduction in male fertility. Present findings in the mouse may be of interest to human male fertility.