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8. DSD
BrownMed
30
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Pre-School
11/02/2010

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Term
SRY gene>>>
Definition
informs gonadal sex of chromosomal sex. gonads then give hormonal output which informs phenotypic sex.
Term
gonad differentiation determined by
Definition
TDF - produced from SRY gene on Y chromosome
Term
genes other than sry in differentiation
Definition
Sox9(differentiation like sry), WT1(Wilms), SF1(regulates AMH), DSS (inhibits sry and makes ovaries)
Term
no AMH AND no testosterone
Definition
vs. testosterone AND AMH. internal ductile system.
Term
MIF
Definition
=AMH
Term
DHT AND androgen receptor
Definition
vs. no DHT OR no androgen receptor. external genitalia.
Term
MIF deficiency
Definition
pseudovaginal perineoscrotal hypospadias
Term
what do you need for evaluating for DSD? (6)
Definition
absence of testes in males (but otherwise normal phenotype) and vice versa, OR hypospadias + undescended testis, OR perineal hypospadias. Female- clitoral hypertrophy, hernia with gonad, fused labia minora
Term
true hermaphroditism
Definition
having both ovaries and testicles
Term
exogenous reasons for virilization of females
Definition
only 10% of cases; tumor, or maternal adrogen ingestion
Term
3 CAH types
Definition
21-hydroxylase (90% cases), 50-65% of them present with vascular collapse and salt wasting, increased 17-OH progesterone in the serum. 11-beta hydroxylase: salt retention. 3 beta ol dehydrogenase: rare, fatal, severe salt wasting, ambiguous genitalia in BOTH sexes
Term
indication for CAH screening / what to test
Definition
previous child with it. test for 17-hydroxyprogesterone(2nd trimester only), 21-hydroxylase gene
Term
amniocentesis
Definition
2nd trimester; 1st trimester = chorionic villous sampling
Term
CAH prenatal treatment
Definition
dexamethasone - begin at 6th week to prevent adrenal androgen production
Term
where can things go wrong in male sexual differentiation (4)
Definition
androgen receptor, testosterone, 5alpha-reductase, MIF
Term
AIS
Definition
X-linked recessive, amenorrhea, inguinal hernia with testis in female, maybe ambiguous genitalia, maybe palpable gonads in a female = testicular feminization
Term
5alpha-reductase deficiency
Definition
pseudo-vaginal perineoscrotal hypospadias, inguinal testes palpable, nonvirilized until puberty
Term
pigmented ambiguous genitalia
Definition
CAH
Term
ambiguous genitalia radiography (2)
Definition
genitogram (contrast) or ultrasound
Term
ambiguous genitalia cytogenetics
Definition
buccal smear (barr body, fluorescent), karyotype (FISH)
Term
ambiguous genitalia biochemistry (6)
Definition
serum more effective than urine; serum: electrolytes, testosterone, 17-OH progesterone. urine: 17 ketosteroid (steroids), 17 OH P
Term
determining sexual assignment (5)
Definition
prognosis for fertility, sexual orientation, gender identity, underlying etiology of ambiguity, appearance and prospect for reconstruction
Term
surgeries (4)
Definition
feminization of boys and girls, virilization of boys, removing potentially cancerous gonads
Term
making labia minora
Definition
from clitoral foreskin
Term
if surgery to change sex of rearing is done neonatally
Definition
testosterone probably won't matter, but if done at age 6 months then it won't "work". = neonatal imprinting, prenatal imprinting
Term
cloacal exstrophy
Definition
at least half boys changed to girls had gender identity issues. maximal testosterone imprinting. REINER data.
Term
CAH usually raised how
Definition
female, for fertility purposes
Term
penile agenesis usually raised how
Definition
as boys - phalloplasty
Term
"social emergency"
Definition
myth
Term
fertility ensured with mullerian derivatives?
Definition
no
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