Protein tyrosine phosphatase PTPN14 is a regulator of lymphatic function and choanal development in humans.

Abstract:

:The lymphatic vasculature is essential for the recirculation of extracellular fluid, fat absorption, and immune function and as a route of tumor metastasis. The dissection of molecular mechanisms underlying lymphangiogenesis has been accelerated by the identification of tissue-specific lymphatic endothelial markers and the study of congenital lymphedema syndromes. We report the results of genetic analyses of a kindred inheriting a unique autosomal-recessive lymphedema-choanal atresia syndrome. These studies establish linkage of the trait to chromosome 1q32-q41 and identify a loss-of-function mutation in PTPN14, which encodes a nonreceptor tyrosine phosphatase. The causal role of PTPN14 deficiency was confirmed by the generation of a murine Ptpn14 gene trap model that manifested lymphatic hyperplasia with lymphedema. Biochemical studies revealed a potential interaction between PTPN14 and the vascular endothelial growth factor receptor 3 (VEGFR3), a receptor tyrosine kinase essential for lymphangiogenesis. These results suggest a unique and conserved role for PTPN14 in the regulation of lymphatic development in mammals and a nonconserved role in choanal development in humans.

journal_name

Am J Hum Genet

authors

Au AC,Hernandez PA,Lieber E,Nadroo AM,Shen YM,Kelley KA,Gelb BD,Diaz GA

doi

10.1016/j.ajhg.2010.08.008

subject

Has Abstract

pub_date

2010-09-10 00:00:00

pages

436-44

issue

3

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(10)00421-0

journal_volume

87

pub_type

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