{
  "id": 17090392,
  "title": "Neanderthal DNA still survives in our human family tree. What were our ancient relatives' relationships like?",
  "url": "https://urgent.news/2026/10/29/neanderthal-dna-still-survives-in-our-human-family-tree-what-were-our",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-29T16:00:00.000Z",
  "source": {
    "name": "Live Science",
    "slug": "live-science",
    "url": "https://www.livescience.com/archaeology/neanderthals/neanderthals-and-our-ancestors-mated-repeatedly-what-were-these-relationships-like"
  },
  "original_language": "en",
  "account": "In a limestone cave along Turkey's Mediterranean coast lies a site known as Üçağızlı II, where Neanderthals and modern humans coexisted. This discovery has left scientists puzzled about the nature of their interactions. Although modern humans and Neanderthals interbred, leaving nearly every non-African person with 2% Neanderthal DNA, there has never been any archaeological evidence of direct cohabitation. The question remains: how did these relationships unfold between these two ancient human species? One of the most intriguing findings comes from the X chromosome, which carries distinct genetic patterns compared to other chromosomes. A study published in 2010 revealed that Neanderthal DNA was less prevalent on the X chromosome in modern humans, prompting researchers to investigate possible explanations. One hypothesis suggested that Neanderthal gene variants on the X chromosome were incompatible with modern human biology and had gradually been eliminated over time. However, this explanation could not account for the specific pattern observed on the X chromosome. To better understand the genetic record and unravel the mystery of their relationships, researchers turned to the X chromosome. They discovered that Neanderthal X chromosomes contained more modern human DNA in noncoding regions than in coding regions. This pattern was not a result of selection for better gene variants but rather a reflection of the biological realities of reproduction. In a typical pregnancy, females contribute an X chromosome via their egg, while males contribute either an X or a Y via their sperm. Consequently, more Neanderthal DNA would be inherited from modern human mothers than from Neanderthal fathers. This pattern suggests that Neanderthal males were more likely to reproduce with modern human females, leading to a higher proportion of modern human X chromosomes in the Neanderthal gene pool. This insight provides valuable information about the mating preferences and social dynamics between Neanderthals and modern humans during their time on Earth.",
  "summary": "Developing research suggests that ancient interbreeding wasn't random — it was socially patterned, directional and far more complicated than the headlines suggest.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}