Protein-tyrosine phosphatase, nonreceptor type 11 mutation analysis and clinical assessment in 45 patients with Noonan syndrome.
We report on PTPN11 (protein-tyrosine phosphatase, nonreceptor type 11) mutation analysis and clinical assessment in 45 patients with Noonan syndrome. Sequence analysis was performed for all of the coding exons 1-15 of PTPN11, revealing a novel 3-bp deletion mutation and 10 recurrent missense mutations in 18 patients. Clinical assessment showed that 1) the growth pattern was similar in mutation-positive and mutation-negative patients, with no significant difference in birth length [-0.6 +/- 2.2 sd (n = 10) vs. -0.6 +/- 1.4 sd (n = 21); P = 0.95], childhood height [-2.6 +/- 1.1 sd (n = 14) vs. -2.1 +/- 1.6 sd (n = 23); P = 0.28], or target height [-0.4 +/- 0.9 sd (n = 14) vs. -0.2 +/- 0.7 sd (n = 17); P = 0.52]; 2) pulmonary valve stenosis was more frequent in mutation-positive patients than in mutation-negative patients (10 of 18 vs. 6 of 27; P = 0.02), as was atrial septal defect (10 of 18 vs. 4 of 27; P = 0.005), whereas hypertrophic cardiomyopathy was present in five mutation-negative patients only; and 3) other features were grossly similar in the prevalence between mutation-positive and mutation-negative patients, but hematological abnormalities, such as bleeding diathesis and juvenile myelomonocytic leukemia, were exclusively present in mutation-positive patients (5 of 18 vs. 0 of 27; P = 0.007). The results suggest that PTPN11 mutations account for approximately 40% of Noonan syndrome patients, as has been reported previously. Furthermore, assessment of clinical features, in conjunction with data reported previously, implies that the type of cardiovascular lesions and the occurrence of hematological abnormalities are different in mutation-positive and mutation-negative patients, whereas the remaining findings are similar in the two groups of patients.
Yoshida
Rie
R
Department of Pediatrics, Keio University School of Medicine, Tokyo 160-8582, Japan.
Hasegawa
Tomonobu
T
Hasegawa
Yukihiro
Y
Nagai
Toshiro
T
Kinoshita
Eiichi
E
Tanaka
Yoko
Y
Kanegane
Hirokazu
H
Ohyama
Kenji
K
Onishi
Toshikazu
T
Hanew
Kunihiko
K
Okuyama
Torayuki
T
Horikawa
Reiko
R
Tanaka
Toshiaki
T
Ogata
Tsutomu
T
D000293:Adolescent; D000328:Adult; D001827:Body Height; D002318:Cardiovascular Diseases / Q000453:epidemiology / Q000235:genetics; D002648:Child; D002675:Child, Preschool; D004252:DNA Mutational Analysis; D005091:Exons; D005260:Female; D017353:Gene Deletion; D006128:Growth; D006402:Hematologic Diseases / Q000235:genetics; D006801:Humans; D015994:Incidence; D007223:Infant; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D009154:Mutation; D020125:Mutation, Missense; D009634:Noonan Syndrome / Q000235:genetics / Q000473:pathology / Q000503:physiopathology*; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D017027:Protein Tyrosine Phosphatases / Q000235:genetics*; D011666:Pulmonary Valve Stenosis / Q000453:epidemiology / Q000235:genetics
D047908:Intracellular Signaling Peptides and Proteins; C516724:PTPN11 protein, human; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D017027:Protein Tyrosine Phosphatases