EVIDENCE CHAPTER 02

Age coverage currently explains more than sex alone.

Four age windows, unequal coverage, and the limits on interpreting sex differences.

THE COURSE ACROSS AGE + SEX

The clearest difference is how far the available histories extend across age.

The detailed female loss-of-function histories reach adulthood; the male loss-of-function histories stop by about age twelve. I can describe what is visible. I cannot call later differences a sex effect until age and documentation are matched.

FOUR AGE WINDOWSOpen the age-ordered female and male loss-of-function comparison

INFANCY → PRESCHOOL

The first signals are often developmental—but already multisystem.

AVAILABLE FEMALE LOSS-OF-FUNCTION HISTORIES

The detailed female loss-of-function histories include sleepy or inefficient feeding, latch fatigue, reflux, thickened liquids, pocketing or choking, prematurity, tone and gait differences, delayed language, sleep disruption, ENT burden, and growth or endocrine questions. No one feature is required.

AVAILABLE MALE LOSS-OF-FUNCTION HISTORIES

The detailed male loss-of-function histories include aspiration or temporary tube support, a tiring suck, temperature concerns, delayed walking and speech, soft-food dependence, early constipation, hypotonia, and emerging oral-motor difficulty.

Interpretive limit: Prematurity, illness, prenatal exposure, additional findings, and depth of available documentation stay visible. Improvement in feeding, walking, speech, or sleep is part of the history—not a reason to erase the earlier vulnerability.

SCHOOL YEARS

New demands reveal the difference between ability and access.

AVAILABLE FEMALE LOSS-OF-FUNCTION HISTORIES

Female histories make language formulation, decoding-versus-retention, sequencing, executive load, evolving seizure and EEG findings, ENT and mucosal disease, sleep studies, immune testing, pain, and behavior under fatigue easier to see.

AVAILABLE MALE LOSS-OF-FUNCTION HISTORIES

Male histories contain some of the clearest oral, dental, motor, and bowel trajectories: failure to establish true chewing, delayed permanent teeth and retained primary teeth, speech apraxia, gait burden, constipation progressing to withholding, and imaging-reported impaction with overflow.

Interpretive limit: A formal PET report showing severe bilateral cerebellar hypometabolism in one young male is a single-person research signal. It is not an established ASH1L imaging pattern.

PUBERTY → ADOLESCENCE

Waking state, hormones, seizures, memory, and autonomy become new variables.

AVAILABLE FEMALE LOSS-OF-FUNCTION HISTORIES

The female loss-of-function record includes puberty- and menstrual-linked windows, evolving absence and convulsive seizures, persistent EEG abnormalities, waking-linked clusters, VNS follow-up, memory and retrieval concerns, bowel and mucosal burden, and changes in alertness or regulation.

AVAILABLE MALE LOSS-OF-FUNCTION HISTORIES

The detailed male loss-of-function histories end by about age twelve. They cannot tell us what male adolescence looks like.

Interpretive limit: The clearest current difference is how far the available histories extend across age. It cannot be used to claim a biological difference in severity.

ADULTHOOD + TRANSITION

Adult female histories reveal both vulnerability and continued development.

AVAILABLE FEMALE LOSS-OF-FUNCTION HISTORIES

The available adult female loss-of-function histories bring cardiac rhythm treatment, fatigue, sleep and infection burden, memory-retrieval questions, pain, autonomic events, relationships, athletics, self-advocacy, recovery, and later-life diagnostic questions into view.

AVAILABLE MALE LOSS-OF-FUNCTION HISTORIES

There is no adult male loss-of-function history among these detailed histories. Any future sex analysis must recruit or document older males.

Interpretive limit: Differences in age, amount of documentation, access to care, additional findings, and biology can all shape what appears in these histories. This small group cannot separate those influences.

WHAT THE INFORMATION CAN SHOW + NEXT MEASUREMENTSWhat this chapter supports, what remains unknown, and what to measure next

METHODS & TERMS

The sitewide evidence rules are kept in one place.

Methods & Privacy explains the evidence-label definitions, count rules, missing-information framework, and privacy approach used throughout ASH1L.org.

A genetic result tells us where to look. A life course tells us what the gene may actually mean for a person.
— Abbey