Brief report: Under-representation of African americans in autism genetic research: a rationale for inclusion of subjects representing diverse family structures.

Hilton et al. (2010) looked at autism genetic registries. They asked why so few African American families appear in the data banks.

The team checked family structure rules. Many studies only accept households with two married parents.

Two-thirds of willing African American families were turned away. The only reason was family shape, not science.

Single-parent, grandparent-led, or blended homes were labeled “non-traditional” and dropped.

Granieri et al. (2020) later interviewed Black parents. They found stigma and distrust also keep families out, stacking more bricks on the wall L et al. first spotted.

Barton et al. (2019) tracked the same kids forward. Black children start autism treatment years later, showing exclusion has a long tail.

Kim et al. (2025) zoom out. Their 2025 review says Hispanic and Native American children are now the most under-identified, but Black families still face the same gatekeeping rules.

If your intake forms demand two married parents, you are copying the 2010 rule that erased most Black families. Swap “two-parent household required” for “primary caregiver available for visits” and watch your sample widen overnight.