Temple-Baraitser Syndrome and Zimmermann-Laband Syndrome: one clinical entity?

Abstract:

BACKGROUND:KCNH1 encodes a voltage-gated potassium channel that is predominantly expressed in the central nervous system. Mutations in this gene were recently found to be responsible for Temple-Baraitser Syndrome (TMBTS) and Zimmermann-Laband syndrome (ZLS). METHODS:Here, we report a new case of TMBTS diagnosed in a Lebanese child. Whole genome sequencing was carried out on DNA samples of the proband and his parents to identify mutations associated with this disease. Sanger sequencing was performed to confirm the presence of detected variants. RESULTS:Whole genome sequencing revealed three missense mutations in TMBTS patient: c.1042G > A in KCNH1, c.2131 T > C in STK36, and c.726C > A in ZNF517. According to all predictors, mutation in KCNH1 is damaging de novo mutation that results in substitution of Glycine by Arginine, i.e., p.(Gly348Arg). This mutation was already reported in a patient with ZLS that could affect the connecting loop between helices S4-S5 of KCNH1 with a gain of function effect. CONCLUSIONS:Our findings demonstrate that KCNH1 mutations cause TMBTS and expand the mutational spectrum of KCNH1 in TMBTS. In addition, all cases of TMBTS were reviewed and compared to ZLS. We suggest that the two syndromes are a continuum and that the variability in the phenotypes is the result of the involvement of genetic modifiers.

journal_name

BMC Med Genet

journal_title

BMC medical genetics

authors

Mégarbané A,Al-Ali R,Choucair N,Lek M,Wang E,Ladjimi M,Rose CM,Hobeika R,Macary Y,Temanni R,Jithesh PV,Chouchane A,Sastry KS,Thomas R,Tomei S,Liu W,Marincola FM,MacArthur D,Chouchane L

doi

10.1186/s12881-016-0304-4

subject

Has Abstract

pub_date

2016-06-10 00:00:00

pages

42

issue

1

issn

1471-2350

pii

10.1186/s12881-016-0304-4

journal_volume

17

pub_type

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