• PMID: 30358834
• Gene Name: SPATA5
• Condition: Associated with spermatogenesis, Male infertility
• Association: Associated
• Population size: 64
• Population details: 64 (38 oligo-/oligoastheno-zoospermic infertile patients, 26 normozoospermic fertile men)
• Sex: Male
• Infertility type: Male infertility
• Other associated phenotypes: Associated with spermatogenesis, Male infertility

Genome-wide differential methylation analyses identifies methylation signatures of male infertility

Sujit KM, Sarkar S, Singh V, Pandey R, Agrawal NK, Trivedi S, Singh K, Gupta G, Rajender S.

STUDY QUESTION: Do methylation changes in sperm DNA correlate with infertility? STUDY ANSWER: Loss of spermatogenesis and fertility was correlated with 1680 differentially-methylated CpGs (DMCs) across 1052 genes. WHAT IS KNOWN ALREADY: Methylation changes in a number of genes have been correlated with reduced sperm count and motility. STUDY DESIGN, SIZE, DURATION: This case-control study used spermatozoal DNA from 38 oligo-/oligoastheno-zoospermic infertile patients and 26 normozoospermic fertile men. PARTICIPANTS/MATERIALS, SETTINGS, METHODS: Genome-wide methylation analysis was undertaken using 450 K BeadChip on spermatozoal DNA from six infertile and six fertile men to identify DMCs. This was followed by deep sequencing of spermatozoal DNA from 32 infertile patients and 20 fertile controls. MAIN RESULTS AND THE ROLE OF CHANCE: A total of 1680 DMCs were identified, out of which 1436 were hypermethylated and 244 were hypomethylated. Classification of DMCs according to the genes identified BCAN, CTNNA3, DLGAP2, GATA3, MAGI2 and TP73 among imprinted genes, SPATA5, SPATA7, SPATA16 and SPATA22 among spermatogenesis-associated genes, KDM4C and JMJD1C, EZH2 and HDAC4 among genes which regulate methylation and gene expression, HLA-C, HLA-DRB6 and HLA-DQA1 among complementation and immune response genes, and CRISPLD1, LPHN3 and CPEB2 among other genes. Genes showing significant differential methylation in deep sequencing, i.e. HOXB1, GATA3, EBF3, BCAN and TCERG1L, are strong candidates for further investigations. The role of chance was ruled out by deep sequencing of select genes. LARGE-SCALE DATA: N/A. LIMITATIONS, REASON FOR CAUTION: Genome-wide analyses are fairly accurate, but may not be exactly validated in replication studies across all DMCs. We used the 't' test in the genome-wide methylation analysis, whereas other tests could provide a more robust and powerful analysis. WIDER IMPLICATIONS OF THE FINDINGS: DMCs can serve as markers for inclusion in infertility screening panels, particularly those in the genes showing differential methylation consistent with previous studies. The genes validated by deep sequencing are strong candidates for investigations of their roles in spermatogenesis. STUDY FUNDING/COMPETING INTEREST(S): The study was funded by the Council of Scientific and Industrial Research (CSIR), Govt. of India with grant number BSC0101 awarded to Rajender Singh. None of the authors has any competing interest to declare. FAU - Sujit, Kumar Mohanty AU - Sujit KM AD - Division of Endocrinology, Central Drug Research Institute, Lucknow, India. FAU - Sarkar, Saumya AU - Sarkar S AD - Division of Endocrinology, Central Drug Research Institute, Lucknow, India. FAU - Singh, Vertika AU - Singh V AD - Department of Molecular and Human Genetics, Banaras Hindu University, Varanasi, India. FAU - Pandey, Rajesh AU - Pandey R AD - CSIR Ayurgenomics Unit-TRISUTRA, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India. AD - Mammalian Genetics Unit, MRC Harwell Institute, Harwell Science and Innovation Campus, Oxfordshire, UK. FAU - Agrawal, Neeraj Kumar AU - Agrawal NK AD - Department of Endocrinology and Metabolism, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India. FAU - Trivedi, Sameer AU - Trivedi S AD - Department of Urology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India. FAU - Singh, Kiran AU - Singh K AD - Department of Molecular and Human Genetics, Banaras Hindu University, Varanasi, India. FAU - Gupta, Gopal AU - Gupta G AD - Division of Endocrinology, Central Drug Research Institute, Lucknow, India.