Schizophrenia genetics — core exam facts (not comms)
- Multifactorial and polygenic; no single gene; not Mendelian.
- High heritability (~70–80%), but genes ≠ destiny.
- Family history raises risk; most children of an affected parent do not develop schizophrenia.
- No predictive clinical test for individuals or foetuses.
- Quote absolute risks and compare with baseline (see risk card); tailor numbers to the case.
- Emphasise modifiable factors and risk ≠ certainty.
- Keep answers relevant; avoid over-precision.
(Card source: CASC podcast—Genetics in Schizophrenia)
Absolute risks to quote — schizophrenia genetics
- General population lifetime risk ≈ ~1% (1 in 100).
- One affected parent → offspring risk ~10–13%.
- Both affected parents → offspring risk ~40–46%.
- Sibling (first-degree) → ~6–10%.
- Twins (illustrative): monozygotic ~40–50%; dizygotic ~10–15%.
- Always contrast with baseline (e.g., 1% → 10–13% with one affected parent).
- Only state figures relevant to the case; avoid showing off extra numbers.
(Card source: CASC podcast—Genetics in Schizophrenia)
Modifiable risks & practical prevention — schizophrenia
- Avoid cannabis, especially daily or high-THC and during adolescence (risk increases with potency/frequency).
- Avoid other recreational drugs; minimise alcohol and nicotine.
- Reduce early adversity; ensure stable caregiving, housing, education, and social support.
- Manage perinatal risks (antenatal care, nutrition, minimise maternal stress, protect sleep).
- Associations to know: perinatal complications (e.g., hypoxia, low birthweight), urbanicity, advanced paternal age.
- Strategy: risk reduction and early detection; not prediction.
(Card source: CASC podcast—Genetics in Schizophrenia)
schizophrenia
Testing & screening (UK) — what exists vs what doesn’t
- No NHS predictive prenatal/postnatal test for schizophrenia risk.
- Polygenic risk scores are not recommended for clinical decision-making (weak individual predictive value).
- NIPT screens for aneuploidy; it does not test for schizophrenia.
- Chromosomal microarray/rare CNVs (e.g., 22q11.2) can increase vulnerability but are not deterministic and are not routine for “schizophrenia risk”.
- Bottom line: you cannot test whether a baby will develop schizophrenia.
(Card source: CASC podcast—Genetics in Schizophrenia)
schizophrenia
Pregnancy, perinatal care & UK legal context (genetics station adjunct)
- Care: involve Perinatal Mental Health Team; coordinate with obstetrics/midwifery/health visitor; review antipsychotics; plan postnatal relapse prevention.
- UK law: abortion lawful to 23+6 weeks under Section 1(1)(a); later only on specified grounds (e.g., serious foetal anomaly, risk to life or grave permanent injury).
- Early medical abortion at home is permitted within legal limits in England & Wales.
- 2025: Commons voted to decriminalise women for their own abortions; time limits and clinical framework unchanged (professionals still regulated).
- Genetic risk alone is not a “serious foetal anomaly”; if termination is raised, the usual ground is maternal mental/physical health.
(Card source: CASC podcast—Genetics in Schizophrenia)
CASC genetics: the universal frame to use across Alzheimer’s/schizophrenia/ADHD stations?
Core frame
- Most mental illnesses are multifactorial: polygenic vulnerability + life course/environment; not Mendelian.
- Heritability is appreciable, but no single deterministic gene in routine cases.
- Use the same logic for Alzheimer’s, schizophrenia, ADHD, perinatal queries.
How to communicate
- State relative risk vs population; avoid false precision in individuals.
- Vulnerability ≠ destiny. Early-onset in the index case ⇒ stronger genetic loading; late-onset ⇒ weaker.
- Testing rarely clarifies in typical late-onset scenarios.
Template one‑liners
- “Risk is higher than average, not guaranteed.”
- “For typical late‑onset disease, no test predicts who will get it.”
- “Let’s focus on controllables for brain health.”
Alzheimer’s genetics station: what’s the optimal choreography?
Flow (time‑boxed)
1. Open (60–90 s): introduce, signpost purpose, empathise about the parent’s diagnosis; invite concerns.
2. 20‑second explainer (if asked): progressive memory‑led dementia; Alzheimer’s = commonest subtype; causation = age + polygenic risk + environment.
3. Clarify concern: “You’re asking about your risk/testing?” Validate the worry.
4. Risk & testing (2–3 min): quantify ~3–4× relative risk; prediction limits; no useful predictive test in typical late‑onset.
5. Practical counsel (1–2 min): actionable brain‑health behaviours.
6. Close (30 s): recap; next steps; support for family care.
Forks to anticipate
- “Any blood tests?” → Not predictive for typical late‑onset. Research only, promising
- “Specific diet? Smoking protective?” → No; advise general healthy diet; smoking not recommended.
- “What about my children?” → Restate multifactorial model + non‑determinism.
Alzheimer’s risk: figures & interpretation you must memorise?
Facts
- First‑degree relative with dementia → ~3–4× the population risk.
- This is relative risk; does not enable individual prediction.
- Earlier onset in index case ⇒ stronger genetic loading.
- Typical late‑onset (e.g., mid‑70s dx) ⇒ points away from a strong monogenic cause.
- Autosomal‑dominant familial Alzheimer’s is rare (~1%) of all cases.
How to say it
- “Your risk is higher than average, but most in your situation do not develop Alzheimer’s.”
- If pressed for numbers beyond 3–4×: avoid false precision; reiterate prediction limits.
- Pause to validate emotion; then preview: “I’ll cover testing and what you can do next.”
Alzheimers
Testing stance: what can you offer—and what not—in typical late‑onset risk queries?
Position
- For typical late‑onset Alzheimer’s, there is no predictive blood/genetic test for individuals.
- Architecture is polygenic with many small‑effect variants; known variants don’t deterministically predict disease.
- Therefore, routine genetic testing is not indicated.
How to phrase
- “There isn’t a test that can tell whether you will develop Alzheimer’s.”
- Manage expectations re direct‑to‑consumer panels → not actionable here.
Edge cases (signpost, don’t deep‑dive)
- Very early onset and/or multiple affected across generations ⇒ consider specialist genetics/neurology input.
- Still doesn’t guarantee prediction.
Pivot
- “Since testing won’t decide things, let’s focus on brain‑health steps and supporting your dad’s care.”
Alzheimers
Modifiable risks & practical counsel you should give?
Big picture
- Ageing is the dominant risk factor (non‑modifiable).
What to encourage
- Regular physical activity.
- Balanced diet; no specific evidence‑based “anti‑Alzheimer’s” diet.
- Cognitive engagement: learning, puzzles, complex hobbies (build/maintain cognitive reserve).
- Avoid smoking: past claims of protection are unconvincing; harms are clear.
Associations to mention (don’t overstate causality)
- Prior head injury, history of depression, lower education, Down syndrome.
Close with agency
- Short action list: move most days; eat a balanced diet; keep learning & socially engaged; don’t smoke; seek help early for low mood; manage head‑injury risk.
- Emphasise: these steps lower risk broadly but do not guarantee prevention.
Transferable template & high‑yield phrases for any CASC ‘genetics’ station?
Template
- Frame multifactorial causation + heritability without determinism.
- Quantify a solid relative risk if known (here 3–4×); avoid over‑precision.
- Clarify that routine predictive testing is unhelpful in typical cases.
- Finish with practical controllables and support offers.
Calibrated reassurance
- “Higher than average” yet “most won’t develop it.”
- Definite where justified: “No predictive test for typical late‑onset disease.”
- Early‑onset/multiple cases ⇒ stronger genetic loading (rare in routine stems).
Killer lines
- “You’re right to ask; it’s a common worry.”
- “Risk is increased, not determinative.”
- “Testing wouldn’t change what we can tell you or do.”
- “Let’s focus on brain‑health habits you can control.”
Prodromal Psychosis — Core Picture & Red Flags
Definition: pre‑psychotic phase lasting weeks–months with subtle, non‑florid changes, often recognised only in hindsight.
Core features to elicit:
* Social withdrawal and isolation.
* Decline in functioning: missed work/uni, poorer performance, reduced self‑care.
* Suspiciousness/mistrust; reduced engagement with friends/family.
* Sleep and appetite changes; poorer concentration.
* Reduced interest/initiative (appears apathetic/avolitional).
* Vague or odd speech; non‑specific answers.
* Mildly bizarre behaviour: talking to self at night, accusing others of stealing, giggling at inappropriate times.
Differential signal: overlaps with depression (low drive, biological symptoms, poor concentration), but prodrome is more likely to include mistrust, vague unusual ideas, subtle thought/perceptual change, and inappropriate/blunted affect.
Risk focus: self‑neglect (nutrition, hygiene, finances, medication); ask explicitly and quantify impact.
Typical pathway: concerns raised by family/GP; patient may be guarded and not actively help‑seeking.
Exam aim: obtain a history from which psychosis could be diagnosed; do not label or disclose a diagnosis unless the stem instructs you to.
History Structure — Suspected Prodromal Psychosis
Timeline: first noticeable change, onset, duration, trajectory (progressive/episodic), precipitating stressors.
Functional impact: work/education, ADLs/self‑care, sleep, appetite, day structure, socialising.
Relational/suspiciousness: trust in others, feeling watched/talked about, avoidance of specific places/people.
Unusual behaviour: staying in, new routines/rituals, accusing theft, late‑night talking to self, odd giggling.
Mood/anxiety: baseline mood, anhedonia, diurnal variation, guilt/hopelessness; anxiety/panic.
Cognition: concentration, memory for recent events, subjective “brain fog.”
Psychosis screen (once you’ve enough info): ideas of reference; persecutory ideas; voices/visions/other modalities; thought interference (insertion/withdrawal); Reference - TV/radio “messages.”
If positives present: origin/context; first awareness; triggers; conviction; preoccupation; safety behaviours; effect on functioning.
Physical symptoms: headaches/somatic complaints and any explanatory beliefs.
Risk: self‑neglect, self‑harm, harm to others, vulnerability/exploitation, finances and nutrition.
MSE throughout: name what you observe (speech vagueness, affect incongruity, responding).
Background/collateral: past psych, substances (incl. cannabis/stimulants), family history of psychosis, developmental/academic attainment, recent stressors; collateral from relative/GP.
Output: clear timeline + impact + symptom screen + risk + collateral to support/exclude a psychotic prodrome.
Prodrome vs Depression — How to Tell in a 7‑minute History
Motivation/pleasure test: If they do the activity, do they enjoy it?
• Depression: anhedonia — enjoyment reduced when done.
• Prodrome: may enjoy once started, but initiation/drive is poor (avolition) or avoidance due to mistrust.
Affective quality:
• Depression: pervasive low mood, guilt, hopelessness, tearfulness.
• Prodrome: blunted/incongruous affect, inappropriate smiling, less clear subjective sadness.
Thinking/speech:
• Depression: slowed but coherent; ruminative guilt/worthlessness.
• Prodrome: vague, non‑specific answers; odd/detached content; early ideas of reference or vague persecutory flavour.
Reasons for withdrawal:
• Depression: low energy/interest.
• Prodrome: can’t trust people/feel talked about/“foggy head.”
Perceptual phenomena:
• Depression: none unless psychotic depression.
• Prodrome: subtle AH/VH/other modalities possible; describe frequency/impact.
Course:
• Depression: may have clear precipitant; variable impairment.
• Prodrome: weeks–months of social/occupational decline with subtly odd behaviours.
Risk profile:
• Depression: higher active self‑harm risk;
• Prodrome: self‑neglect and vulnerability prominent (ask both).
High‑yield discriminators: trust‑based avoidance; ideas of reference; thought interference; inappropriate affect.
Psychotic Phenomena — Focused Screening for a Prodromal State
Expect vaguer, lower‑conviction material than florid psychosis. Still screen comprehensively:
Ideas of reference: “Do you get the sense others are talking about you? Any signs/TV/radio sending messages?”
Persecutory ideas/mistrust: “Any worries people are against you, watching, or might harm you?”
Thought interference: “Ever feel thoughts are put in or taken out, or not fully your own?”
Perceptual change (all modalities):
• Auditory: voices when no one’s there; name/number/valence; inside/outside head; commands?
• Visual; olfactory; gustatory; tactile phenomena.
Phenomenology (if positive):
• Origin/context and first awareness.
• Conviction (0–100%), preoccupation, frequency/duration.
• Triggers, precipitating stressors.
• Impact: avoidance, safety behaviours, confrontation, calls to police/GP.
• Insight/meaning: how they explain it; alternative explanations entertained?
• Risk links: commands involving harm; beliefs leading to neglect or conflict.
In a prodrome, expect “odd feelings,” vague mistrust, or intermittent anomalous experiences rather than fixed delusions/hallucinations — but document precisely; subtlety is still positive evidence.
Mental State Examination — Subtle Signs to Name and Document
Appearance/behaviour: self‑care standard; eye contact; psychomotor change; engagement/guardedness; responding to unseen stimuli.
Speech: rate/volume/fluency; note vagueness, non‑specific answers, tangentiality; any loosening/derailment (often subtle).
Mood/affect: subjective mood; objective affect (blunted, incongruous, inappropriate smiling/laughter).
Thought form: poverty of content, circumstantiality, flight/tangentiality; coherence.
Thought content: suspiciousness, ideas of reference, persecutory themes, over‑valued ideas; suicidal/homicidal ideation.
Perception: AH/VH/others — frequency, content, distress, control.
Cognition: orientation grossly; attention/concentration (months backwards, WORLD backwards if time allows).
Insight: understanding of difficulties; acceptance of help.
Examiner behaviours that score: explicitly comment on what you observe (“I notice your answers are quite general”; “you smiled while we discussed something serious”).
Link observations to functioning/risk (“…and you’ve missed classes and stopped seeing friends”).
Avoid labelling as “weird/odd”; use neutral, descriptive language.
Risk in the Prodrome — What to Prioritise and How to Elicit
Priority: self‑neglect. Cover nutrition, hydration, sleep, hygiene, money management, medication adherence, unsafe living (leaving hobs on, doors unlocked).
Ask directly and quantify: weight change; days without washing; skipped meals; unpaid bills; missed doses.
Suicidality: mood‑linked thoughts, planning, access to means, past acts. Even if denial, document protective factors and monitoring.
Harm to others: anger/suspicion toward specific persons; confrontations; weapons; police involvement.
Vulnerability/safeguarding: exploitation, scams, bullying, theft; capacity to manage benefits/finances; social isolation.
Substance risk: cannabis/stimulants/alcohol worsening paranoia or amotivation.
Dynamic risk formulation:
* Risks (self‑neglect, exploitation, SH/VO).
* Drivers (mistrust, cognitive fog, sleep loss, cannabis).
* Buffers (family support, routine, GP contact).
* Next steps appropriate to the stem (e.g., share concerns with GP/family, agree monitoring, consider urgent review if rapid deterioration).
Promdoromal psychosis
Background, Collateral and Contributors — What to Cover
Past psychiatric history: prior assessments, diagnoses, admissions, antipsychotic/antidepressant trials, adherence and response.
Family history: psychosis, bipolar, other severe mental illness; age at onset; functional impact.
Substances: alcohol; cannabis (frequency, potency); stimulants; psychedelics; prescribed/OTC misuse.
Medical: headaches/somatic complaints; thyroid, neurological history; current meds; recent infections.
Development/trajectory: educational attainment and any tailing‑off; social milestones; premorbid personality.
Psychosocial stressors: exams, relationship/family conflict, bereavement, migration, finances, housing.
Collateral: GP and family/household reports (often the referral source); timeline of changes; objective examples of decline/oddities.
Contextualise: cross‑sectional snapshot plus longitudinal change; specify baseline versus current.
Purpose: strengthen/undermine a psychotic prodrome hypothesis and guide risk/management priorities.
Exam Technique — Cues, Pitfalls, and What Examiners Actually Want
Follow cues relentlessly: if something sounds deliberately “odd,” it is — ask for examples and impact. Examiners plant clues.
Name observations: vagueness, incongruent affect, inappropriate smiling — then link to functioning and risk.
Do not pathologise in‑room: avoid calling behaviour “weird/odd”; use neutral descriptors.
Use the brief: if the stem mentions family/GP concern (common here), leverage it to anchor timelines and examples.
Sequence for yield: functional decline → mood/anxiety → (once enough context) psychosis screen → risk → background/collateral.
You are not obliged to give a diagnosis unless the stem asks. Your job is a tight, evidence‑rich history from which psychosis could be inferred.
Common fails: skipping self‑neglect; not distinguishing anhedonia vs avolition; failing to ask about thought interference; not documenting affect incongruity; ignoring collateral.
Alcohol CASC: Social & Legal Complications — station scope
Aim: quantify CURRENT drinking and map SOCIAL/LEGAL harms. Not a full dependence history.
Focus: present pattern, volumes, strengths, duration at this level; then harms in key domains; then immediate risks/safeguarding; then summary + plan.
What you DON’T need unless volunteered: detailed withdrawal history, medical comorbidity screen, full past psych/substance history. Keep tight.
Method: start broad (frequency) → typical day → precise measures (pints/cans/ml; single/double; standard vs high‑strength) → brief duration.
Domains to cover briskly: relationships/children; work/education; driving & legal; finances; wider social life.
Risk flags to surface: domestic violence (perpetration or victim), child exposure/neglect, drink‑driving (including morning‑after), police/court matters.
Style: brief empathy; indirect probe first, then explicit impact questions. Reflect back salient facts to anchor insight, but keep momentum.
Time split (7 min): ~2 min consumption, ~3 min domains, ~1 min risk/safeguarding, ~1 min summary/plan.
Output the examiner wants: a clean, structured harm map that justifies next steps (referral, safeguarding, brief advice) and demonstrates risk awareness.
Eliciting current alcohol use fast
Start: “How often do you drink?” Do not assume daily. If unclear: “Do you drink every day?”
Typical day walkthrough: first drink/time → sequence across day. For each: type; measure (pints/cans/units; single/double; ml); strength (ABV/high‑strength); number consumed. Spirits: self‑poured vs measured. Beer: normal vs super‑strength.
Pattern: daily vs binge; morning use; hair‑of‑the‑dog; drinking alone; pre‑loading; inability to delay first drink.
Quantify: estimate total daily units (or weekly if non‑daily). Alcohol‑free days? Duration at current level. Recent changes (upward trend?).
Consequences spotted while asking: blackouts, near misses at work/driving, conflicts at home.
Finish with a one‑sentence consumption headline you can reuse: pattern + volume + duration (e.g., “Daily, first at 10:00, ~20 units/day for 2 years, minimal alcohol‑free days”).
Avoid: sprawling narratives and diagnostic deep‑dives—the station is about social/legal impact tied to today’s consumption.
Al;cohol social legal impacts
Relationships & safeguarding (targeted)
Relationship status; partner’s view; recent conflicts; intimacy/communication changes; trust issues (lying about spend/time).
Probe impact before naming it: “How are things between you when alcohol is in the picture?” → specifics (missed events, broken promises).
Escalate to risk: arguments physical? injuries? property damage? police called? Any coercive control? Substance‑linked sexual risk?
Children: who lives at home; ages; supervision while intoxicated; missed school runs/bedtime care; prior social care involvement/Child in Need/CP plan.
Collateral concerns from partner/school/GP? Any safety plans already?
Record concrete examples; they anchor motivation and determine safeguarding threshold. If violence/child concerns emerge, state you would consider safeguarding per local policy and offer support pathways—all within exam time.
Bottom line: convert “relationship problems” into specific, risk‑graded facts.
Work/education functioning
Role/course; tenure; safety‑critical tasks (driving, machinery, clinical care). Performance trend; targets missed; complaints.
Attendance: lateness/absences; sickness notes; ‘Monday absences’; disciplinary/warnings/capability; occupational health involvement; fitness‑to‑work queries.
On‑duty alcohol: drinking at lunch, smelling of alcohol, covert use; near misses/accidents; colleagues raising concerns; required disclosures for regulated roles (GMC/HCPC/SIA/etc.).
Consequences: demotion, suspension, dismissal, lost income; impact on references and re‑employment.
Capture verifiable anchors (final warning, written complaint, OH report). These quantify harm and guide the urgency of change and employer liaison (with consent).
Driving, police & legal consequences
Driving: licence held? miles driven weekly? essential duties (work/school runs). Timing of last drink before driving; morning‑after awareness; previous accidents/near misses.
Police: ever stopped/breathalysed? outcomes—verbal warning, caution, charge, court. Sentences: fine, community order, ban (length remaining), conditions (e.g., courses/interlocks). Any bail conditions/no‑contact orders.
Other offences linked to alcohol (public order, assault, criminal damage). Victims? Injuries?
Legal/insurance impacts: invalidated cover, increased premiums, job loss where licence essential.
Note specifics; they feed your summary and risk formulation. If active ban/RTA risk, flag immediately in plan.
