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The term sperm refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell.

Researchers advance fertility options for childhood cancer survivors

Researchers at Karolinska Institutet have demonstrated that it is possible to create early germ cells from preserved testicular tissue of young boys facing cancer therapy.

3 Jul 2026

Genetics play a bigger role than pregnancy in childhood obesity risk

Genetic factors primarily explain the link between parental and childhood BMI, with maternal obesity impacting birth weight more than later childhood obesity.

1 Jul 2026

New protocol identifies sperm biomarkers to diagnose male infertility

Researchers from the EHU-University of the Basque Country have developed a robust protocol to detect the molecules involved in the metabolic reactions of sperm.

26 Jun 2026

Base editing technique reveals crucial gene for early human development

Research led by the University of Cambridge Loke Centre for Trophoblast Research has shown that a genome editing technique can be used to alter a single gene in human embryonic cells, enabling the study of very early human development in unparalleled detail.

25 Jun 2026

Most IVF add-ons lack evidence of fertility benefits

There is a lack of evidence to suggest the majority of in vitro fertilization (IVF) add-ons improve fertility in patients undergoing IVF, according to a systematic review and meta-analysis published in The Lancet Obstetrics, Gynaecology, & Women's Health journal.

24 Jun 2026

How clinicians can identify and manage Ebola, hantavirus

Two deadly infectious diseases, Ebola https://www.cmaj.ca/lookup/doi/10.1503/cmaj.260834 and hantavirus https://www.cmaj.ca/lookup/doi/10.1503/cmaj.260789, have made headlines in recent weeks as they pose serious threats to public health.

22 Jun 2026

Men's fertility-friendly underwear may be briefs without benefits

A narrative review found that tight-fitting underwear may modestly raise scrotal temperature and is inconsistently linked to lower sperm production measures. However, current evidence does not show that switching to looser underwear improves real-world fertility outcomes.

17 Jun 2026

GLP-1s may improve testosterone levels and sperm quality in men with obesity

GLP‑1s do not harm male hormones or fertility after long-term use, according to a study being presented Monday at ENDO 2026, the Endocrine Society's annual meeting in Chicago, Ill.

15 Jun 2026

Uninherited parental genes leave lasting imprint on children's lives

Our parents' genes, even the ones we didn't inherit, leave a measurable lasting imprint on our lives. An international team led by researchers at the Institute of Science and Technology Austria (ISTA) and the Norwegian Institute of Public Health developed a new approach to analyze genetic data from tens of thousands of families.

9 Jun 2026

Fathers shape childhood obesity risk long before birth

New research highlights fathers' influence on childhood obesity risk through sperm changes, lifestyle, and parenting, urging inclusive prevention strategies.

9 Jun 2026

Father's alcohol use before conception impacts offspring development

A growing body of research suggests that a father's health before conception may play a larger role in child development than previously understood - and researchers are working to understand how a father's drinking before conception may affect offspring health and development.

8 Jun 2026

Fathers' health may shape children's future obesity ris

As obesity rates rise across the U.S., new research from Joe C. Wen School of Population & Public Health at the University of California, Irvine scientists draws attention to an often-overlooked factor in children's long-term health: fathers.

4 Jun 2026

Jumping genes help strengthen the mammalian Y chromosome

The humble Y chromosome may be the smallest chromosome in the mammalian genome (and getting even smaller), but it is mighty: genes on the Y chromosome are critical for fertility in males.

1 Jun 2026

Research challenges long standing beliefs about cannabis and male hormones

The effects of cannabis on the hormonal system and male fertility remain controversial within the scientific community. A study conducted by the University of Geneva (UNIGE), in collaboration with the Swiss Center for Applied Human Toxicology (SCAHT), provides a new answer by showing that cannabis use does not reduce testosterone levels in young men and may even increase its testicular synthesis.

28 May 2026

Cells detect and silence invading transposons through abnormal RNA signals

Transposons, DNA sequences that can self-replicate and move (jump) throughout the genome, are widespread and can affect cell survival if left unchecked. Cells control these "jumping genes" by silencing them, but little was known about how cells recognize and defend themselves from invading transposons.

26 May 2026

Study links fathers’ preconception stress to altered offspring development

Research from the University of Colorado Anschutz suggests that stress experienced by a father before conception may influence an offspring's growth by altering small molecular signals in sperm.

26 May 2026

UC Davis scientists identify protein key to male fertility

The causes of male infertility can be hard to diagnose, with many tests failing to detect genetic defects. Sometimes, infertility doesn't even involve the genes themselves.

19 May 2026

AI-driven hormone tracking could help detect infertility early and improve conception

Men and women who appear hormonally 'normal' may still have undetected disruptions in the timing and coordination of their reproductive hormones that could impair fertility, according to research presented at the 28th European Congress of Endocrinology in Prague.

8 May 2026

Early chemical exposure linked to sperm abnormalities in men

An estimated 7% of all men are affected by infertility. Multiple animal studies indicated that exposure to persistent environmental chemicals in early life can negatively impact male reproductive health, and now a human study suggests the same.

4 May 2026

Study advances safe, reversible male contraceptive without hormones

Cornell University scientists have taken a major step toward developing a safe, reversible, long-acting and 100% effective nonhormonal male contraceptive, considered the holy grail of male contraception.

7 Apr 2026