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Genes (Basel). 2019 May 7;10(5). pii: E342. doi: 10.3390/genes10050342.

Congenital Leptin Deficiency and Leptin Gene Missense Mutation Found in Two Colombian Sisters with Severe Obesity.

Author information

1
Dexa Diab IPS, Bogotá 110221, Colombia. h.yupanqui1@hotmail.com.
2
Texas Biomedical Research Institute, San Antonio, TX 78227, USA. raul@txbiomed.org.
3
Dexa Diab IPS, Bogotá 110221, Colombia. maria.yupanquiv@gmail.com.
4
Facultad de Medicina, Fundación Universitaria Juan N. Corpas, Bogotá 111161, Colombia. monica.alvarez@juanncorpas.edu.co.
5
Genetica Molecular de Colombia, Bogotá 111221, Colombia. oseban87@gmail.com.
6
Facultad de Medicina, Universidad de La Sabana, Chía 53753, Colombia. aidagiraldo92@gmail.com.
7
Facultad de Medicina, Universidad de La Sabana, Chía 53753, Colombia. alexandraarse09@hotmail.com.
8
Facultad de Medicina, Universidad de La Sabana, Chía 53753, Colombia. caritorres147@hotmail.com.
9
Facultad de Medicina, Universidad de La Sabana, Chía 53753, Colombia. amgohu@hotmail.com.
10
NeuRos, Instituto de Medicina Traslacional, Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario, Bogotá 111711, Colombia. claudio.mastronardi@urosario.edu.co.
11
GeniURos, CIGGUR, Instituto de Medicina Traslacional, Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario, Bogotá 111711, Colombia. carlosmrestrepo@gmail.com.
12
Texas Biomedical Research Institute, San Antonio, TX 78227, USA. ernito18@gmail.com.
13
Texas Biomedical Research Institute, San Antonio, TX 78227, USA. edna.navag@uanl.mx.
14
Grupo de Investigación en Psiquiatría (GIPSI), Instituto de Investigaciones Médicas. Facultad de Medicina, Universidad de Antioquia, Medellín 050010, Colombia. mauricioarcosburgos@gmail.com.
15
Texas Biomedical Research Institute, San Antonio, TX 78227, USA. jkent@txbiomed.org.
16
Texas Biomedical Research Institute, San Antonio, TX 78227, USA. scole@txbiomed.org.
17
SUNY Upstate Medical University, Syracuse, NY 13210, USA. juliolicinio@gmail.com.
18
Facultad de Medicina, Universidad de La Sabana, Chía 53753, Colombia. luis.celis@unisabana.edu.co.

Abstract

BACKGROUND:

Congenital leptin deficiency is a recessive genetic disorder associated with severe early-onset obesity. It is caused by mutations in the leptin (LEP) gene, which encodes the protein product leptin. These mutations may cause nonsense-mediated mRNA decay, defective secretion or the phenomenon of biologically inactive leptin, but typically lead to an absence of circulating leptin, resulting in a rare type of monogenic extreme obesity with intense hyperphagia, and serious metabolic abnormalities.

METHODS:

We present two severely obese sisters from Colombia, members of the same lineal consanguinity. Their serum leptin was measured by MicroELISA. DNA sequencing was performed on MiSeq equipment (Illumina) of a next-generation sequencing (NGS) panel involving genes related to severe obesity, including LEP.

RESULTS:

Direct sequencing of the coding region of LEP gene in the sisters revealed a novel homozygous missense mutation in exon 3 [NM_002303.3], C350G>T [p.C117F]. Detailed information and clinical measurements of these sisters were also collected. Their serum leptin levels were undetectable despite their markedly elevated fat mass.

CONCLUSIONS:

The mutation of LEP, absence of detectable leptin, and the severe obesity found in these sisters provide the first evidence of monogenic leptin deficiency reported in the continents of North and South America.

KEYWORDS:

Colombian sisters; LEP gene; congenital leptin deficiency; consanguinity; extreme obesity; novel mutation

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