Children's Hospital of Philadelphia is probably the best place to go.  I am not an expert but I believe that they may be able to assist you.  There website is:

http://www.chop.edu/conditions-diseases/alagille-syndrome#.VUy_evnZUd9

http://www.chop.edu/pages/alagille-syndrome-publications#.VUy_PfnZUd8

Some of their publications include:

General Alagille articles

Kamath BM, Piccoli DA. Heritable disorders of the bile ducts. Gastroenterol Clin North Am. 2003 Sep;32(3):857-75.

Emerick KM, Rand EB, Goldmuntz E, Krantz ID, Spinner NB, Piccoli DA. Features of Alagille syndrome in 92 patients: frequency and relation to prognosis. Hepatology. 1999; 29(3):822-9.

Krantz ID, Piccoli DA, Spinner NB. Syndrome of the month: Alagille syndrome. J Med Genet. 1997; 34: 152-157.

Krantz ID, Piccoli DA, Spinner NB. Clinical and molecular genetics of Alagille syndrome. Curr Opin Pediatr. 1999; 11(6):558-64.

Kaye AJ, Rand EB, Munoz PS, Spinner NB, Flake AW, Kamath BM. Effect of Kasai procedure on hepatic outcome in Alagille syndrome. J Pediatr Gastroenterol Nutr. 2010 Jun 30. Cited in PubMed; PMID 20601899. 

Cardiac disease

Krantz ID, Smith R, Colliton RP, Tinkel H, Zackai EH, Piccoli DA, Goldmuntz E, Spinner NB. Jagged1 mutations in patients ascertained with isolated congenital heart defects. Am J Med Genet. 1999; 84(1):56-60.

Loomes KM, Underkoffler LA, Morabito J, Gottlieb S, Piccoli DA, Spinner NB, Baldwin HS, Oakey RJ. The expression of Jagged1 in the developing mammalian heart correlates with cardiovascular disease in Alagille syndrome. Hum Mol Genet. 1999; 8(13):2443-9.

McElhinney DB, Krantz ID, Bason L, Piccoli DA, Emerick KM, Spinner NB, Goldmuntz E.Analysis of cardiovascular phenotype and genotype-phenotype correlation in individuals with a JAG1 mutation and/or Alagille syndrome. Circulation. 2002; 106(20):2567-74.

Genetics

Spinner NB. Genetics of Alagille Syndrome. Prog in Cardiol. 2005; 20:169-176

Kamath BM, Bason L, Piccoli DA, Krantz ID, Spinner NB. Consequences of JAG1 mutations. J Med Genet. 2003; 40(12):891-5.

Kamath BM, Loomes KM, Oakey RJ, Emerick KE, Conversano T, Spinner NB, Piccoli DA,Krantz ID. Facial features in Alagille syndrome: specific or cholestasis facies? Am J Med Genet. 2002;112(2):163-70.

Albayram F, Stone K, Nagey D, Schwarz KB, Blakemore K. Alagille syndrome: prenatal diagnosis and pregnancy outcome. Fetal Diagn Ther. 2002;17(3):182-4.

Kamath BM, Stolle C, Bason L, Colliton RP, Piccoli DA, Spinner NB, Krantz ID.Craniosynostosis in Alagille syndrome. Am J Med Genet. 2002;112(2)176-80.

Spinner NB, Colliton RP, Crosnier C, Krantz ID, Hadchouel M, Meunier-Rotival M.Mutation Update: Jagged1 Mutations in Alagille syndrome. Hum Mut. 2001; 17:18-33.

Louis AA, Van Eyken P, Haber BA, Hicks C, Weinmaster G, Taub R, Rand EB. Hepatic jagged1 expression studies. Hepatology. 1999;30(5):1269-75.

Spinner NB. Alagille syndrome and the notch signaling pathway: new insights into human development. Gastroenterology. 60, 1999; 116(5):1257-60.

Rand EB. The genetic basis of the Alagille syndrome. J Pediatr Gastroenterol Nutr. 1998; 26(2):234-6.

Li L, Krantz ID, Deng Y, Genin A, Banta AB, Collins CC, Qi M, Trask BJ, Kuo WL, Cochran J, Costa T, Pierpont ME, Rand EB, Piccoli DA, Hood L, Spinner NB. Alagille syndrome is caused by mutations in human Jagged1, which encodes a ligand for Notch1. Nat Genet. 1997; 16(3):243-51.

Growth and nutrition

Arvay JL, Zemel BS, Gallagher PR, Rovner AJ, Mulberg AE, Stallings VA, Haber BA.Body composition of children aged 1 to 12 years with biliary atresia or Alagille syndrome. J Pediatr Gastroenterol Nutr. 2005;40(2):146-50.

Rovner AJ, Schall JI, Jawad AF, Piccoli DA, Stallings VA, Mulberg AE, Zemel BS.Rethinking growth failure in Alagille syndrome: the role of dietary intake and steatorrhea. J Pediatr Gastroenterol Nutr. 2002;35(4):495-502.

Wasserman D, Zemel BS, Mulberg AE, John HA, Emerick KM, Barden EM, Piccoli DA, Stallings VA. Growth, nutritional status, body composition, and energy expenditure in prepubertal children with Alagille syndrome. J Pediatr. 1999; 134(2):172-7.

Liver disease and transplantation

Witzleben CL, Finegold M, Piccoli DA, Treem WR. Bile canalicular morphometry in arteriohepatic dysplasia. Hepatology. 1987; 7:1262-1266.

Skeletal defects

Olsen IE, Ittenbach RF, Rovner AJ, Leonard MB, Mulberg AE, Stallings VA, Piccoli DA,Zemel BS. Deficits in size-adjusted bone mass in children with Alagille syndrome. J Pediatr Gastroenterol Nutr. 2005 Jan;40(1):76-82.

Vascular

Emerick KM, Krantz ID, Kamath BM, Darling C, Burrowes DM, Spinner NB, Whitington PF,Piccoli DA. Intracranial vascular abnormalities in patients with Alagille syndrome. J Pediatr Gastroenterol Nutr. 2005;41(1):99-107.

Kamath BM, Spinner NB, Emerick KM, Chudley AE, Booth C, Piccoli DA, Krantz. Vascular anomalies in Alagille syndrome: a significant cause of morbidity and mortality. Circulation. 2004; 109 (11):1354-8.

Textbook chapters

Kamath BM, Loomes KM, Piccoli DA. JAGGED1NOTCH2 sequence in Alagille syndrome. In: Murray K, Larson AM, editors. Fibrocystic disease of the liver. 1st ed. New York: Springer-Verlag; 2010.

Kamath BM, Piccoli DA. Alagille syndrome. In: Liacouras CA, Piccoli DA, editors. Pediatric gastroenterology: the requisites. Philadelphia: Saunders/Churchill/Mosby; 2008. p. 227-232.

Kamath BM, Piccoli DA. Alagille Syndrome. In: Encyclopedia of Pediatric Gastroenterology. Elsevier; 2004. p. 20-24.

Kamath BM, Krantz ID. Alagille Syndrome. In: Cassidy and Allanson, editor. Management of Genetic Syndromes, 2nd edition.. Wiley-Liss, 2005, p. 31-40.

Piccoli DA. Alagille Syndrome. In: Suchy F, editor. Liver Disease in Children, 2nd ed. Philadelphia: W.B. Saunders; 2001. p. 327-342.

Piccoli DA, Witzleben CL. Disorders of Intrahepatic Bile Ducts. In: Walker , Goulet, Kleinman, Sherman, Shneider, Sanderson editors. Pediatric Gastrointestinal Disease: Pathophysiology, Diagnosis, Management. 4th ed. Hamilton, Ontario: BC Decker Inc.;2004.

Rand EB. Alagille syndrome. In Altschuler SM, Liacouras CA., editors. Pediatric Gastroenterology. London: Churchill, Livingstone, Inc.; 1997.

Also this is a special organization for this syndrome.

http://www.alagille.org/

Hello,

Great question close control will be required during pregnancy by booth patients. Ultrasound and biochemical screening should be done but biochemical results should be observer holisticly.

There are a possibility with digital PCR to observe the voulume of The JAG1 and NOTCH2 which are the triggers of the syndrome. The samples could be taken from maternal blood so invasive procedure will not required.

wish

Karoly

Discussion With Your collegues before any       Hello

Strict  and Close follow up are  needed in this sydrome. Diabetes and high blood pressure are medical Challenges but With consistent Medical  follow up  most women can  have healthy pregnancy till term.  Discussi With Your collegues before any Medical intervention.                                   .