Search for a rare disease

* (*) mandatory field

Other search option(s)

Suggest an update

(*) Required fields.


Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed.

Orphanet doesn't provide personalised answers. To get in touch with the Orphanet team, please contact

Information provided in your contribution (including your email address) will be stocked in .CSV files that will be sent as an email to Orphanet's teams. These emails might be conserved in the teams' mailboxes, in our backoffice servers but will not be registered in our databases (for more information see our section General Data Protection Regulation and data privacy (GDPR) and Confidentiality).

Captcha image


Disease definition

TMEM165-CDG is a form of congenital disorders of N-linked glycosylation characterized by a psychomotor delay-dysmorphism (pectus carinatum, dorsolumbar kyphosis and severe sinistroconvex scoliosis, short distal phalanges, genua vara, pedes planovalgi syndrome) with postnatal growth deficiency and major spondylo-, epi-, and metaphyseal skeletal involvement. Additional features include facial dysmorphism (midface hypoplasia, internal strabism of the right eye, low-set ears, moderately high arched palate, small teeth), nephrotic syndrome, cardiac defects, and feeding problems. The disease is caused by mutations in the gene TMEM165 (4q12).


Classification level: Disorder
  • Synonym(s):
    • CDG syndrome type IIk
    • CDG-IIk
    • CDG2K
    • Carbohydrate deficient glycoprotein syndrome type IIk
    • Congenital disorder of glycosylation type 2k
    • Congenital disorder of glycosylation type IIk
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal recessive 
  • Age of onset: Infancy, Neonatal
  • ICD-10: E77.8
  • OMIM: 614727
  • UMLS: C3553571
  • MeSH: -
  • GARD: 12413
  • MedDRA: -

Detailed information

Disease review articles

ERN produced/endorsed by ERN(s)   FSMR produced/endorsed by FSMR(s)
The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care by a qualified specialist and should not be used as a basis for diagnosis or treatment.