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Microcephaly 27, primary, autosomal dominant(MCPH27)

MedGen UID:
1783457
Concept ID:
C5543051
Disease or Syndrome
Synonyms: MCPH27; MICROCEPHALY 27, PRIMARY, AUTOSOMAL DOMINANT
 
Gene (location): LMNB2 (19p13.3)
 
Monarch Initiative: MONDO:0030929
OMIM®: 619180

Definition

Autosomal dominant primary microcephaly-27 (MCPH27) is characterized by small head circumference apparent in early childhood and associated with global developmental delay manifest as delayed walking, inability to walk, impaired intellectual development, and poor or absent speech. Most patients have variable and nonspecific additional features, including facial dysmorphism, hypotonia, limb hypertonia, poor feeding, and distal skeletal anomalies. Brain imaging may show enlarged ventricles or gyral abnormalities, but most have normal imaging (Parry et al., 2021). For a general phenotypic description and a discussion of genetic heterogeneity of primary microcephaly, see MCPH1 (251200). [from OMIM]

Clinical features

From HPO
Cryptorchidism
MedGen UID:
8192
Concept ID:
C0010417
Congenital Abnormality
Cryptorchidism, or failure of testicular descent, is a common human congenital abnormality with a multifactorial etiology that likely reflects the involvement of endocrine, environmental, and hereditary factors. Cryptorchidism can result in infertility and increases risk for testicular tumors. Testicular descent from abdomen to scrotum occurs in 2 distinct phases: the transabdominal phase and the inguinoscrotal phase (summary by Gorlov et al., 2002).
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.
Tapered finger
MedGen UID:
98098
Concept ID:
C0426886
Finding
The gradual reduction in girth of the finger from proximal to distal.
Hip subluxation
MedGen UID:
140946
Concept ID:
C0434785
Injury or Poisoning
A partial dislocation of the hip joint, whereby the head of the femur is partially displaced from the socket.
Short finger
MedGen UID:
334977
Concept ID:
C1844548
Anatomical Abnormality
Abnormally short finger associated with developmental hypoplasia.
Clinodactyly of the 5th finger
MedGen UID:
340456
Concept ID:
C1850049
Congenital Abnormality
Clinodactyly refers to a bending or curvature of the fifth finger in the radial direction (i.e., towards the 4th finger).
Metatarsus adductus
MedGen UID:
898667
Concept ID:
C4082169
Anatomical Abnormality
The metatarsals are deviated medially (tibially), that is, the bones in the front half of the foot bend or turn in toward the body.
Chronic constipation
MedGen UID:
98325
Concept ID:
C0401149
Sign or Symptom
Constipation for longer than three months with fewer than 3 bowel movements per week, straining, lumpy or hard stools, and a sensation of anorectal obstruction or incomplete defecation.
Delayed ability to walk
MedGen UID:
66034
Concept ID:
C0241726
Finding
A failure to achieve the ability to walk at an appropriate developmental stage. Most children learn to walk in a series of stages, and learn to walk short distances independently between 12 and 15 months.
Delayed speech and language development
MedGen UID:
105318
Concept ID:
C0454644
Finding
A degree of language development that is significantly below the norm for a child of a specified age.
Global developmental delay
MedGen UID:
107838
Concept ID:
C0557874
Finding
A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.
Simplified gyral pattern
MedGen UID:
413664
Concept ID:
C2749675
Finding
An abnormality of the cerebral cortex with fewer gyri but with normal cortical thickness. This pattern is usually often associated with congenital microcephaly.
Ventriculomegaly
MedGen UID:
480553
Concept ID:
C3278923
Finding
An increase in size of the ventricular system of the brain.
Extra-axial cerebrospinal fluid accumulation
MedGen UID:
868477
Concept ID:
C4022871
Finding
An increased amount of cerebrospinal fluid (CSF) in the subarachnoid space.
Trigonocephaly
MedGen UID:
82713
Concept ID:
C0265535
Congenital Abnormality
Wedge-shaped, or triangular head, with the apex of the triangle at the midline of the forehead and the base of the triangle at the occiput.
Joint hypermobility
MedGen UID:
336793
Concept ID:
C1844820
Finding
The capability that a joint (or a group of joints) has to move, passively and/or actively, beyond normal limits along physiological axes.
Primary microcephaly
MedGen UID:
383046
Concept ID:
C2677180
Finding
Head circumference below 2 standard deviations below the mean for age and gender at birth.
Drooling
MedGen UID:
8484
Concept ID:
C0013132
Finding
Habitual flow of saliva out of the mouth.

Recent clinical studies

Etiology

Olbrich P, Lorenz M, Cura Daball P, Lucena JM, Rensing-Ehl A, Sanchez B, Führer M, Camacho-Lovillo M, Melon M, Schwarz K, Neth O, Speckmann C
Pediatr Allergy Immunol 2016 Sep;27(6):640-4. Epub 2016 May 27 doi: 10.1111/pai.12585. PMID: 27116393

Therapy

Olbrich P, Lorenz M, Cura Daball P, Lucena JM, Rensing-Ehl A, Sanchez B, Führer M, Camacho-Lovillo M, Melon M, Schwarz K, Neth O, Speckmann C
Pediatr Allergy Immunol 2016 Sep;27(6):640-4. Epub 2016 May 27 doi: 10.1111/pai.12585. PMID: 27116393

Clinical prediction guides

Olbrich P, Lorenz M, Cura Daball P, Lucena JM, Rensing-Ehl A, Sanchez B, Führer M, Camacho-Lovillo M, Melon M, Schwarz K, Neth O, Speckmann C
Pediatr Allergy Immunol 2016 Sep;27(6):640-4. Epub 2016 May 27 doi: 10.1111/pai.12585. PMID: 27116393

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