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Hypogonadotropic hypogonadism 9 with or without anosmia(HH9)

MedGen UID:
766756
Concept ID:
C3553842
Disease or Syndrome
Synonyms: HH9; HYPOGONADOTROPIC HYPOGONADISM 9 WITH ANOSMIA, SUSCEPTIBILITY TO; HYPOGONADOTROPIC HYPOGONADISM 9 WITHOUT ANOSMIA, SUSCEPTIBILITY TO; NELF-Related Hypogonadotropic Hypogonadism
 
Gene (location): NSMF (9q34.3)
 
Monarch Initiative: MONDO:0013911
OMIM®: 614838

Disease characteristics

Isolated gonadotropin-releasing hormone (GnRH) deficiency (IGD) is characterized by inappropriately low serum concentrations of the gonadotropins LH (luteinizing hormone) and FSH (follicle-stimulating hormone) in the presence of low circulating concentrations of sex steroids. IGD is associated with a normal sense of smell (normosmic IGD) in approximately 40% of affected individuals and an impaired sense of smell (Kallmann syndrome) in approximately 60%. IGD can first become apparent in infancy, adolescence, or adulthood. Infant boys with congenital IGD often have micropenis and cryptorchidism. Adolescents and adults with IGD have clinical evidence of hypogonadism and incomplete sexual maturation on physical examination. Adult males with IGD tend to have prepubertal testicular volume (i.e., <4 mL), absence of secondary sexual features (e.g., facial and axillary hair growth, deepening of the voice), decreased muscle mass, diminished libido, erectile dysfunction, and infertility. Adult females have little or no breast development and primary amenorrhea. Although skeletal maturation is delayed, the rate of linear growth is usually normal except for the absence of a distinct pubertal growth spurt. [from GeneReviews]
Authors:
Ravikumar Balasubramanian  |  William F Crowley   view full author information

Additional description

From OMIM
Congenital idiopathic hypogonadotropic hypogonadism (IHH) is a disorder characterized by absent or incomplete sexual maturation by the age of 18 years, in conjunction with low levels of circulating gonadotropins and testosterone and no other abnormalities of the hypothalamic-pituitary axis. Idiopathic hypogonadotropic hypogonadism can be caused by an isolated defect in gonadotropin-releasing hormone (GNRH; 152760) release, action, or both. Other associated nonreproductive phenotypes, such as anosmia, cleft palate, and sensorineural hearing loss, occur with variable frequency. In the presence of anosmia, idiopathic hypogonadotropic hypogonadism has been called 'Kallmann syndrome (KS),' whereas in the presence of a normal sense of smell, it has been termed 'normosmic idiopathic hypogonadotropic hypogonadism (nIHH)' (summary by Raivio et al., 2007). Because families have been found to segregate both KS and nIHH, the disorder is here referred to as 'hypogonadotropic hypogonadism with or without anosmia (HH).' For a discussion of genetic heterogeneity of hypogonadotropic hypogonadism with or without anosmia, see 147950.  http://www.omim.org/entry/614838

Clinical features

From HPO
Decreased testicular size
MedGen UID:
66027
Concept ID:
C0241355
Finding
Reduced volume of the testicle (the male gonad).
Micropenis
MedGen UID:
1633603
Concept ID:
C4551492
Congenital Abnormality
Abnormally small penis. At birth, the normal penis is about 3 cm (stretched length from pubic tubercle to tip of penis) with micropenis less than 2.0-2.5 cm.
Clinodactyly
MedGen UID:
1644094
Concept ID:
C4551485
Congenital Abnormality
An angulation of a digit at an interphalangeal joint in the plane of the palm (finger) or sole (toe).
Anosmia
MedGen UID:
1950
Concept ID:
C0003126
Finding
An inability to perceive odors. This is a general term describing inability to smell arising in any part of the process of smelling from absorption of odorants into the nasal mucous overlying the olfactory epithelium, diffusion to the cilia, binding to olfactory receptor sites, generation of action potentials in olfactory neurons, and perception of a smell.
Hyposmia
MedGen UID:
473584
Concept ID:
C2364082
Finding
A decreased sensitivity to odorants (that is, a decreased ability to perceive odors).
Osteoporosis
MedGen UID:
14535
Concept ID:
C0029456
Disease or Syndrome
Osteoporosis is a systemic skeletal disease characterized by low bone density and microarchitectural deterioration of bone tissue with a consequent increase in bone fragility. According to the WHO criteria, osteoporosis is defined as a BMD that lies 2.5 standard deviations or more below the average value for young healthy adults (a T-score below -2.5 SD).
Cleft palate
MedGen UID:
756015
Concept ID:
C2981150
Congenital Abnormality
Cleft palate is a developmental defect of the palate resulting from a failure of fusion of the palatine processes and manifesting as a separation of the roof of the mouth (soft and hard palate).
Cleft lip
MedGen UID:
1370297
Concept ID:
C4321245
Anatomical Abnormality
A gap in the lip or lips.
Hypogonadotropic hypogonadism
MedGen UID:
82883
Concept ID:
C0271623
Disease or Syndrome
Hypogonadotropic hypogonadism is characterized by reduced function of the gonads (testes in males or ovaries in females) and results from the absence of the gonadal stimulating pituitary hormones
Gynecomastia
MedGen UID:
6694
Concept ID:
C0018418
Disease or Syndrome
Abnormal development of large mammary glands in males resulting in breast enlargement.

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