Complete androgen insensitivity syndrome

Complete androgen insensitivity syndrome
AIS results when the function of the androgen receptor (AR) is impaired. The AR protein (pictured) mediates the effects of androgens in the human body.
Classification and external resources
Specialty endocrinology
ICD-10 E34.51
ICD-9-CM 259.51
OMIM 312300 300068
DiseasesDB 29662 12975
eMedicine ped/2222
MeSH D013734
GeneReviews

Complete androgen insensitivity syndrome (CAIS) is a condition that results in the complete inability of the cell to respond to androgens.[1][2][3] The unresponsiveness of the cell to the presence of androgenic hormones prevents the masculinization of male genitalia in the developing fetus, as well as the development of male secondary sexual characteristics at puberty, but does not significantly impair female genital or sexual development.[3][4] As such, the insensitivity to androgens is only clinically significant when it occurs in genetic males (i.e. individuals with a Y chromosome, or more specifically, an SRY gene).[1] All affected individuals are phenotypically female; they develop a normal female habitus, despite the presence of a Y chromosome.[1][5][6][7][8][9]

CAIS is one of the three categories of androgen insensitivity syndrome (AIS) since AIS is differentiated according to the degree of genital masculinization: complete androgen insensitivity syndrome (CAIS) when the external genitalia is that of a normal female, mild androgen insensitivity syndrome (MAIS) when the external genitalia is that of a normal male, and partial androgen insensitivity syndrome (PAIS) when the external genitalia is partially, but not fully masculinized.[1][2][5][6][7][10][11][12][13]

Androgen insensitivity syndrome is the largest single entity that leads to 46,XY undermasculinization.[14]

Signs and symptoms

Humans with complete androgen insensitivity are born phenotypically female, despite having a 46,XY karyotype.[15][16]

Individuals with complete androgen insensitivity syndrome (grades 6 and 7 on the Quigley scale) are born phenotypically female, without any signs of genital masculinization, despite having a 46,XY karyotype.[17] Symptoms of CAIS do not appear until puberty,[2] which may be slightly delayed,[18] but is otherwise normal except for absent menses and diminished or absent secondary terminal hair.[1] Axillary hair (i.e. armpit hair) fails to develop in one third of all cases.[19] External genitalia is normal, although the labia and clitoris are sometimes underdeveloped.[20][21] The vaginal depth varies widely, but is typically shorter than unaffected women;[1] one study of eight women with CAIS measured the average vaginal depth to be 5.9 cm [22] (vs. 11.1 ± 1.0 cm for unaffected women [23]). In some extreme cases, the vagina has been reported to be aplastic (resembling a "dimple"), though the exact incidence of this is unknown.[24]

The gonads in these women are not ovaries, but instead, are testes; during the embryonic stage of development, testes form in an androgen-independent process that occurs due to the influence of the SRY gene on the Y chromosome.[25][26] They may be located intra-abdominally, at the internal inguinal ring, or may herniate into the labia majora, often leading to the discovery of the condition.[1][27][28][29] Testes in affected women have been found to be atrophic upon gonadectomy.[30] Testosterone produced by the testes cannot be directly used due to the mutant androgen receptor that characterizes CAIS; instead, it is aromatized into estrogen, which effectively feminizes the body and accounts for the normal female phenotype observed in CAIS.[1]

Immature sperm cells in the testes do not mature past an early stage, for sensitivity to androgens is required in order for spermatogenesis to complete.[31][32] Germ cell malignancy risk, once thought to be relatively high, is now thought to be approximately 2%.[33] Wolffian structures (the epididymides, vasa deferentia, and seminal vesicles) are typically absent, but will develop at least partially in approximately 30% of cases, depending on which mutation is causing the CAIS.[34] The prostate, like the external male genitalia, cannot masculinize in the absence of androgen receptor function, and thus remains in the female form.[17][35][36][37]

The Müllerian system (the fallopian tubes, uterus, and upper portion of the vagina) typically regresses due to the presence of anti-Müllerian hormone originating from the Sertoli cells of the testes.[18] These women are thus born without fallopian tubes, a cervix, or a uterus,[18] and the vagina ends "blindly" in a pouch.[1] Müllerian regression does not fully complete in approximately one third of all cases, resulting in Müllerian "remnants".[18] Although rare, a few cases of women with CAIS and fully developed Müllerian structures have been reported. In one exceptional case, a 22-year-old with CAIS was found to have a normal cervix, uterus, and fallopian tubes.[38] In an unrelated case, a fully developed uterus was found in a 22-year-old adult with CAIS.[37]

Other subtle differences that have been reported include slightly longer limbs and larger hands and feet due to a proportionally greater stature than unaffected women,[39][40][41] larger teeth,[42][43] minimal or no acne,[44] well developed breasts,[45] and a greater incidence of meibomian gland dysfunction (i.e. dry eye syndromes and light sensitivity).[46]

Comorbidity

Histopathology of testicular tissue showing immature germ cells and spermatagonia with decreased tubular diameter. Scattered groups of Leydig cells appearing immature.[18]

All forms of androgen insensitivity, including CAIS, are associated with infertility, though exceptions have been reported for both the mild and partial forms.[4][5][7][47][48][49]

CAIS is associated with a decreased bone mineral density.[50][51][52][53][54][55] Some have hypothesized that the decreased bone mineral density observed in women with CAIS is related to the timing of gonadectomy and inadequate estrogen supplementation.[54] However, recent studies show that bone mineral density is similar whether gonadectomy occurs before or after puberty, and is decreased despite estrogen supplementation, leading some to hypothesize that the deficiency is directly attributable to the role of androgens in bone mineralization.[50][51][52][53]

CAIS is also associated with an increased risk for gonadal tumors (e.g. germ cell malignancy) in adulthood if gonadectomy is not performed.[33][56][57][58] The risk of malignant germ cell tumors in women with CAIS increases with age and has been estimated to be 3.6% at 25 years and 33% at 50 years.[58] The incidence of gonadal tumors in childhood is thought to be relatively low; a recent review of the medical literature [56] found that only three cases of malignant germ cell tumors in prepubescent girls have been reported in association with CAIS in the last 100 years. Some have estimated the incidence of germ cell malignancy to be as low as 0.8% before puberty.[1]

Vaginal hypoplasia, a relatively frequent finding in CAIS and some forms of PAIS,[22][24] is associated with sexual difficulties including vaginal penetration difficulties and dyspareunia.[20][24]

At least one study indicates that individuals with an intersex condition may be more prone to psychological difficulties, due at least in part to parental attitudes and behaviors,[59] and concludes that preventative long-term psychological counseling for parents as well as for affected individuals should be initiated at the time of diagnosis.

Lifespan is not thought to be affected by AIS.[1]

Diagnosis

Bilateral inguinal hernia. CAIS is not usually suspected until after puberty unless an inguinal hernia presents.[60]

CAIS can only be diagnosed in normal phenotypic females.[2] It is not usually suspected unless the menses fail to develop at puberty, or an inguinal hernia presents during premenarche.[1][2] As many as 1–2% of prepubertal girls that present with an inguinal hernia will also have CAIS.[1][18]

A diagnosis of CAIS or Swyer syndrome can be made in utero by comparing a karyotype obtained by amniocentesis with the external genitalia of the fetus during a prenatal ultrasound.[2][61] Many infants with CAIS do not experience the normal, spontaneous neonatal testosterone surge, a fact which can be diagnostically exploited by obtaining baseline luteinizing hormone and testosterone measurements, followed by a human chorionic gonadotropin (hGC) stimulation test.[1]

The main differentials for CAIS are complete gonadal dysgenesis (Swyer syndrome) and Müllerian agenesis (Mayer-Rokitansky-Kuster-Hauser syndrome or MRKH).[1][24] Both CAIS and Swyer syndrome are associated with a 46,XY karyotype, whereas MRKH is not; MRKH can thus be ruled out by checking for the presence of a Y chromosome, which can be done either by fluorescence in situ hybridization (FISH) analysis or on full karyotype.[1] Swyer syndrome is distinguished by poor breast development and shorter stature.[1] The diagnosis of CAIS is confirmed when androgen receptor (AR) gene sequencing reveals a mutation, although up to 5% of individuals with CAIS do not have an AR mutation.[2]

Up until the 1990s, a CAIS diagnosis was often hidden from the affected individual and / or family.[17] It is current practice to disclose the genotype at the time of diagnosis, particularly when the affected girl is at least of adolescent age.[17] If the affected individual is a child or infant, it is generally up to the parents, often in conjunction with a psychologist, to decide when to disclose the diagnosis.[17]

Management

Management of AIS is currently limited to symptomatic management; methods to correct a malfunctioning androgen receptor protein that result from an AR gene mutation are not currently available. Areas of management include sex assignment, genitoplasty, gonadectomy in relation to tumor risk, hormone replacement therapy, and genetic and psychological counseling.

Sex assignment

Individuals with CAIS are raised as females.[1] They are born phenotypically female and almost always have a heterosexual female gender identity;[40][62] the incidence of homosexuality in women with CAIS is thought to be less than unaffected women.[63] However, at least two case studies have reported male gender identity in individuals with CAIS.[62][64]

Vaginal length in 8 women with CAIS before and after dilation therapy as first line treatment. The normal reference range (shaded) is derived from 20 control women. Duration and extent of therapy varied; the median time to completion of treatment was 5.2 months, and the median number of 30-minute dilations per week was 5.[22]

Dilation therapy

Most cases of vaginal hypoplasia associated with CAIS can be corrected using non-surgical pressure dilation methods.[22][24] The elastic nature of vaginal tissue, as demonstrated by its ability to accommodate the differences in size between a tampon, a penis, and a baby's head,[65] make dilation possible even in cases when the vaginal depth is significantly compromised.[22][24] Treatment compliance is thought to be critical to achieve satisfactory results.[20][22][24] Dilation can also be achieved via the Vecchietti procedure, which stretches vaginal tissues into a functional vagina using a traction device that is anchored to the abdominal wall, subperitoneal sutures, and a mold that is placed against the vaginal dimple.[24] Vaginal stretching occurs by increasing the tension on the sutures, which is performed daily.[24] The non-operative pressure dilation method is currently recommended as the first choice, since it is non-invasive, and highly successful.[24] Vaginal dilation should not be performed before puberty.[33]

Gonadectomy

While it is recommended that women with CAIS eventually undergo gonadectomy to mitigate cancer risk,[1] there are differing opinions regarding the necessity and timing of gonadectomy.[66] The risk of malignant germ cell tumors in women with CAIS increases with age and has been estimated to be 3.6% at 25 years and 33% at 50 years.[58] However, only three cases of malignant germ cell tumors in prepubescent girls with CAIS have been reported in the last 100 years.[56] The youngest of these girls was 14 years old.[67] If gonadectomy is performed early, then puberty must be artificially induced using gradually increasing doses of estrogen.[1] If gonadectomy is performed late, then puberty will occur on its own, due to the aromatization of testosterone into estrogen.[1] At least one organization, the Australasian Paediatric Endocrine Group, classifies the cancer risk associated with CAIS as low enough to recommend against gonadectomy, although it warns that the cancer risk is still elevated above the general population, and that ongoing cancer monitoring is essential.[66] Some choose to perform gonadectomy if and when inguinal hernia presents.[1] Estrogen replacement therapy is critical to minimize bone mineral density deficiencies later in life.[52][54]

Hormone replacement therapy

Some have hypothesized that supraphysiological levels of estrogen may reduce the diminished bone mineral density associated with CAIS.[52] Data has been published that suggests affected women who were not compliant with estrogen replacement therapy, or who had a lapse in estrogen replacement, experienced a more significant loss of bone mineral density.[51][52] Progestin replacement therapy is seldom initiated, due to the absence of a uterus.[1] Androgen replacement has been reported to increase a sense of well-being in gonadectomized women with CAIS, although the mechanism by which this benefit is achieved is not well understood.[1]

Counseling

It is no longer common practice to hide a diagnosis of CAIS from the affected individual or her family.[17] Parents of children with CAIS need considerable support in planning and implementing disclosure for their child once the diagnosis has been established.[1][17] For parents with young children, information disclosure is an ongoing, collaborative process requiring an individualized approach that evolves in concordance with the child's cognitive and psychological development.[1] In all cases, the assistance of a psychologist experienced in the subject is recommended.[1][17]

Neovaginal construction

Many surgical procedures have been developed to create a neovagina, as none of them is ideal.[24] Surgical intervention should only be considered after non-surgical pressure dilation methods have failed to produce a satisfactory result.[24] Neovaginoplasty can be performed using skin grafts, a segment of bowel, ileum, peritoneum, Interceed,[68][69] buccal mucosa, amnion, or dura mater.[24][70][71] Success of such methods should be determined by sexual function, and not just by vaginal length, as has been done in the past.[71] Ileal or cecal segments may be problematic because of a shorter mesentery, which may produce tension on the neovagina, leading to stenosis.[71] The sigmoid neovagina is thought to be self-lubricating, without the excess mucus production associated with segments of small bowel.[71] Vaginoplasty may create scarring at the introitus (the vaginal opening), which requires additional surgery to correct. Vaginal dilators are required postoperatively to prevent vaginal stenosis from scarring.[22][24] Other complications include bladder and bowel injuries.[24] Yearly exams are required as neovaginoplasty carries a risk of carcinoma,[24] although carcinoma of the neovagina is uncommon.[70][71] Neither neovaginoplasty nor vaginal dilation should be performed before puberty.[24][33]

Prognosis

Challenges presented to people affected by this condition include: psychologically coming to terms with the condition, difficulties with sexual function, infertility. Long-term studies indicate that with appropriate medical and psychological treatment, women with CAIS can be satisfied with their sexual function and psychosexual development.[40] CAIS women can lead active lives and expect a normal lifespan.

See also

References

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  47. ↑ Chu J, Zhang R, Zhao Z, Zou W, Han Y, Qi Q, Zhang H, Wang JC, Tao S, Liu X, Luo Z (January 2002). "Male fertility is compatible with an Arg(840)Cys substitution in the AR in a large Chinese family affected with divergent phenotypes of AR insensitivity syndrome". J. Clin. Endocrinol. Metab. 87 (1): 347–51. PMID 11788673. doi:10.1210/jc.87.1.347.
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