Ochoa Syndrome

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1		Rita Xu	+ 469 word(s)	469	2020-12-15 07:33:36

This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/ochoa-syndrome

Ochoa syndrome is a disorder characterized by urinary problems and unusual facial expressions.

genetic conditions

1. Introduction

The urinary problems associated with Ochoa syndrome typically become apparent in early childhood or adolescence. People with this disorder may have difficulty controlling the flow of urine (incontinence), which can lead to bedwetting. Individuals with Ochoa syndrome may be unable to completely empty the bladder, often resulting in vesicoureteral reflux, a condition in which urine backs up into the ducts that normally carry it from each kidney to the bladder (the ureters). Urine may also accumulate in the kidneys (hydronephrosis). Vesicoureteral reflux and hydronephrosis can lead to frequent infections of the urinary tract and kidney inflammation (pyelonephritis), causing damage that may eventually result in kidney failure.

Individuals with Ochoa syndrome also exhibit a characteristic frown-like facial grimace when they try to smile or laugh, often described as inversion of facial expression. While this feature may appear earlier than the urinary tract symptoms, perhaps as early as an infant begins to smile, it is often not brought to medical attention.

Approximately two-thirds of individuals with Ochoa syndrome also experience problems with bowel function, such as constipation, loss of bowel control, or muscle spasms of the anus.

2. Frequency

Ochoa syndrome is a rare disorder. About 150 cases have been reported in the medical literature.

3. Causes

Ochoa syndrome can be caused by mutations in the HPSE2 gene. This gene provides instructions for making a protein called heparanase 2. The function of this protein is not well understood.

Mutations in the HPSE2 gene that cause Ochoa syndrome result in changes in the heparanase 2 protein that likely prevent it from functioning. The connection between HPSE2 gene mutations and the features of Ochoa syndrome are unclear. Because the areas of the brain that control facial expression and urination are in close proximity, some researchers have suggested that the genetic changes may lead to an abnormality in this brain region that may account for the symptoms of Ochoa syndrome. Other researchers believe that a defective heparanase 2 protein may lead to problems with the development of the urinary tract or with muscle function in the face and bladder.

Some people with Ochoa syndrome do not have mutations in the HPSE2 gene. In these individuals, the cause of the disorder is unknown.

4. Inheritance

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

5. Other Names for This Condition

hydronephrosis with peculiar facial expression
hydronephrosis-inverted smile
inverted smile and occult neuropathic bladder
inverted smile-neurogenic bladder
partial facial palsy with urinary abnormalities
UFS
urofacial Ochoa's syndrome
urofacial syndrome

References

Al Badr W, Al Bader S, Otto E, Hildebrandt F, Ackley T, Peng W, Xu J, Li J,Owens KM, Bloom D, Innis JW. Exome capture and massively parallel sequencingidentifies a novel HPSE2 mutation in a Saudi Arabian child with Ochoa (urofacial)syndrome. J Pediatr Urol. 2011 Oct;7(5):569-73. doi:10.1016/j.jpurol.2011.02.034.
Aydogdu O, Burgu B, Demirel F, Soygur T, Ozcakar ZB, Yalcinkaya F, Tekgul S.Ochoa syndrome: a spectrum of urofacial syndrome. Eur J Pediatr. 2010Apr;169(4):431-5. doi: 10.1007/s00431-009-1042-9.
Daly SB, Urquhart JE, Hilton E, McKenzie EA, Kammerer RA, Lewis M, Kerr B,Stuart H, Donnai D, Long DA, Burgu B, Aydogdu O, Derbent M, Garcia-Minaur S,Reardon W, Gener B, Shalev S, Smith R, Woolf AS, Black GC, Newman WG. Mutationsin HPSE2 cause urofacial syndrome. Am J Hum Genet. 2010 Jun 11;86(6):963-9.Erratum in: Am J Hum Genet. 2010 Aug 13;87(2):309.
Derbent M, Melek E, Arman A, Uçkan S, Baskin E. Urofacial (ochoa) syndrome:can a facial gestalt represent severe voiding dysfunction? Ren Fail.2009;31(7):589-92.
Garcia-Minaur S, Oliver F, Yanez JM, Soriano JR, Quinn F, Reardon W. Three newEuropean cases of urofacial (Ochoa) syndrome. Clin Dysmorphol. 2001Jul;10(3):165-70.
Ochoa B. Can a congenital dysfunctional bladder be diagnosed from a smile? TheOchoa syndrome updated. Pediatr Nephrol. 2004 Jan;19(1):6-12.Review.
Pang J, Zhang S, Yang P, Hawkins-Lee B, Zhong J, Zhang Y, Ochoa B, Agundez JA,Voelckel MA, Fisher RB, Gu W, Xiong WC, Mei L, She JX, Wang CY. Loss-of-function mutations in HPSE2 cause the autosomal recessive urofacial syndrome. Am J HumGenet. 2010 Jun 11;86(6):957-62. Erratum in: Am J Hum Genet. 2010 Jul9;87(1):161. Fisher, Richard B [added].
Stamatiou K, Tyritzis S, Karakos C, Skolarikos A. Urofacial syndrome: a subsetof neurogenic bladder dysfunction syndromes? Urology. 2011 Oct;78(4):911-3. doi: 10.1016/j.urology.2010.12.061.

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Subjects: Genetics & Heredity

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Rita Xu

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Entry Collection: MedlinePlus

Update Date: 24 Dec 2020

Table of Contents

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1. Introduction

2. Frequency

3. Causes

4. Inheritance

5. Other Names for This Condition

References

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1. Introduction

2. Frequency

3. Causes

3.1. The Gene Associated with Ochoa Syndrome

4. Inheritance

5. Other Names for This Condition

References