Discussion: For example, RAMs in HBV reverse transcriptase, A181T/V, M204I and M204V, cause corresponding changes in the overlapping region of HBsAg (W172 stop, W196S/L/Stop and I195M, respectively).
A nuanced role of the small loop of hepatitis B virus small envelope protein in virion morphogenesis and secretion.
Result: Because the entire S gene is embedded within the viral polymerase gene, some viral polymerase mutations that confer drug resistance can cause amino acid sequence changes in HBsAg; major ones include E164D, W172L, L173F, I195M and W196L/S/V.
Hepatitis B Virus preS/S Truncation Mutant rtM204I/sW196* Increases Carcinogenesis through Deregulated HIF1A, MGST2, and TGFbi.
PMID: 32887289
2020
International journal of molecular sciences
Introduction: rtM204I is a common 3TC-resistant mutation emerging in antiviral therapy, and may result in truncation or missense mutations on the overlapping surface gene (sW196*/S/L).
Discussion: As for rtM204I/sW196* (YIDDst in this study), a mutant less commonly encountered than rtM204I/sW196S/L (* 8.2%, L 76.4%, S 10.2%, and L/S 5.1%) in 3TC or Telbivudine-experienced patients, we proved that YIDDst-transfected cells presented a transformation and tumorigenesis potential.
Hepatitis B virus drug resistance mutations in HIV/HBV co-infected children in Windhoek, Namibia.
Abstract: Resistance mutations included rtL80I, rtV173L, rtL180M, rtM204I/V and the overlapping sE164D, sW182*, sI195M and sW196LS variants.
Discussion: Lamivudine resistance mutations detected in the RT region resulted in sE164D, sI195M, and
Viral quasispecies of hepatitis B virus in patients with YMDD mutation and lamivudine resistance may not predict the efficacy of lamivudine/adefovir rescue therapy.
PMID: 30906435
2019
Experimental and therapeutic medicine
Result: In the present study, the most prevalent mutations were those in the S region (sP120Q, sQ129R, sT131I, sM133I, sG145R, sY161F/H, sI195M/T, sW196S/L, sW199C/L and sM213I/T; Table III).
Nucleotide Substitutions in Hepatitis B Viruses Derived from Chronic HBV Patients.
PMID: 31308922
2019
Mediterranean journal of hematology and infectious diseases
Result: Five (5) mutations were detected within the surface gene in the patients (F8L, T118M, E164D, T189I, and W196L).
Result: The most common amino acid change found within HBsAg was W196L in 13 (39.0%) isolates.
Molecular Epidemiology of Hepatitis B Virus in Turkish Cypriot.
PMID: 31880889
2019
Polish journal of microbiology
Discussion: These were rtM204I/sW196L mutations (Table II).
Naturally occurring hepatitis B virus reverse transcriptase mutations related to potential antiviral drug resistance and liver disease progression.
PMID: 29713126
2018
World journal of gastroenterology
Method: RT mutations rtN139K/T/H and rtM204I/V also cause simultaneous mutations in the overlapped HBsAg coding sequence (sT131N/P and sI195M, or sW196S/L/Stop).
Method: The mutations rtA181T/V, rtM204I, and rtM204V also cause the simultaneous HBsAg mutations,
HBV quasispecies composition in Lamivudine-failed chronic hepatitis B patients and its influence on virological response to Tenofovir-based rescue therapy.
Result: After implementing Benjamini-Hochberg correction, 3 (rtM204I, rtL80I, rtY54H) out these 7 RT substitutions and 6 (sS45A, sP46T, sI68T/A, sT118V, sW196L and sR210N) out of 8 S-substitutions remained significantly less frequent in the responders (Table 4).
HBV mutation literature information.
PMID: 
2021
Journal of viral hepatitis
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