Expanding the Neuropsychological Phenotype of KAT6B Disorders: Overlapping Features with KAT6A Syndrome.
KAT6B disorder copies the KAT6A profile — severe autism-like behaviors plus big daily-living gaps — so borrow the same heavy adaptive-teaching plan.
01Research in Context
What this study did
Rowena et al. (2025) looked at kids with KAT6B gene changes. They wanted to see if these kids act like kids with KAT6A changes. The team wrote down each child's autism traits, IQ scores, and daily-living skills. They used the same tests for every child so they could compare results.
What they found
Kids with KAT6B problems showed the same pattern as kids with KAT6A problems. Both groups had lots of autism-like behaviors. Both groups also had very low adaptive scores — skills like dressing, talking, and using money. The two gene faults look like one syndrome on the outside.
How this fits with other research
Moss et al. (2009) already said that different genetic syndromes can look like autism but still have their own face. The new KAT6B data fit right into that picture — another syndrome to add to the list.
Narzisi et al. (2013) and Lai et al. (2017) show that kids with plain high-functioning autism have trouble with executive skills. The KAT6B kids have those same troubles plus bigger daily-living gaps, so they need even more support.
Tong et al. (2024) and Johnson et al. (2021) looked at KMT5B, a cousin gene. KMT5B and KAT6B both lead to autism plus low IQ. The message: when you see that mix, think histone genes and plan for severe adaptive teaching.
Why it matters
If a child's genetic report says KAT6B, expect the KAT6A playbook to work. Start strong adaptive-skills programs early — dressing, toilet use, kitchen safety. Use visual prompts and lots of repetition. Do not assume high-functioning autism tools will be enough; these kids need life-skills first, academics second. Team up with medical genetics so families understand why the child looks like a 'double' of the KAT6A cousin they read about online.
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02At a glance
03Original abstract
KAT6B and KAT6A belong to the MYST family of lysine acetyltransferases, and regulate gene expression via histone modification. Although both proteins share similar structure and epigenetic regulatory functions, it remains unclear if KAT6A/6B mutation disorders, both very rare conditions, yield the same neurocognitive presentation and thus benefit from similar treatment approaches. This study provides a preliminary overview of neuropsychological functioning of 13 individuals with KAT6B disorder (Mean age = 9.01 years, SD = 5.46), which was compared to that of a recently published sample of 15 individuals with KAT6A syndrome (Mean age = 10.32 years, SD = 4.12). Participants completed a neuropsychological test battery to assess non-verbal cognition, and caregivers completed a series of standardized rating inventories to assess daily behavioral functioning. Results reveal those with KAT6B disorders present with severe adaptive deficits (92.3%) and autism-related behaviors (83.3%), juxtaposed with relatively low concerns with externalizing behaviors (7.6%), a pattern shared by the KAT6A group. Those with KAT6B disorders present with high levels of autistic features, including reduced affiliative interest, whereas social motivation is less affected within the KAT6A group. Overall, the levels of impairment in nonverbal cognition and receptive language were comparable among those with KAT6B disorders, a trend also seen in the KAT6A group. In brief, KAT6B and KAT6A disorders yield analogous neuropsychological profiles. Findings implicate common molecular pathophysiological mechanisms for these epigenetic disorders, such that similar therapies may have shared effect across diseases.
Journal of autism and developmental disorders, 2025 · doi:10.1038/s41436-020-0811-8